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Deformation Behavior and Mechanisms of fcc High-Entropy Alloys:Insights from Neutron Diffraction 认领 引用
1
作者 Zhao Yanchun Yao Yatao +9 位作者 Zhang Fan Huang Yan Zhang Yibo Lu Zhichao Zhang Qi Fu Xiaoling Wang Anding Zhang Fei Song Wenli Ma Dong 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2026年第3期655-664,共10页
The multi-principal element characteristic of high-entropy alloys has revolutionized the conventional alloy design concept of single-principal element,endowing them with excellent mechanical properties.However,owing t... The multi-principal element characteristic of high-entropy alloys has revolutionized the conventional alloy design concept of single-principal element,endowing them with excellent mechanical properties.However,owing to this multi-principal element nature,high-entropy alloys exhibit complex deformation behavior dominated by alternating and coupled deformation mechanisms.Therefore,elucidating these intricate deformation mechanisms remains a key challenge in current research.Neutron diffraction(ND)techniques offer distinct advantages over traditional microscopic methods for characterizing such complex deformation behavior.The strong penetration capability of neutrons enables in-situ,real-time,and non-destructive detection of structural evolution in most centimeter-level bulk samples under complex environments,and ND allows precise characterization of lattice site occupations for light elements,such as C and O,and neighboring elements.This review discussed the principles of ND,experiment procedures,and data analysis.Combining with recent advances in the research about face-centered cubic high-entropy alloy,typical examples of using ND to investigate the deformation behavior were summarized,ultimately revealing deformation mechanisms dominated by dislocations,stacking faults,twinning,and phase transformations. 展开更多
关键词 high-entropy alloys neutron diffraction face centered-cubic structure deformation mechanism
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Analytical Modeling of Wave Diffraction by Eccentric Multi-Cylinders Within a Porous Circular Cylinder 认领 引用
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作者 ZHAI Zhen-feng ZHENG Si-ming +1 位作者 ZHAO Tian-cong Gregorio IGLESIAS 《China Ocean Engineering》 SCIE EI CSCD 2026年第3期547-562,共16页
This study investigates the hydrodynamic characteristics of an eccentric multi-cylinder system composed of a porous outer cylinder and multiple inner cylinders,based on linear potential flow theory.A semi-analytical m... This study investigates the hydrodynamic characteristics of an eccentric multi-cylinder system composed of a porous outer cylinder and multiple inner cylinders,based on linear potential flow theory.A semi-analytical model is developed using the eigenfunction expansion method,and its accuracy is validated against existing theoretical and numerical results.The findings reveal that the wave loads on the inner cylinders are highly sensitive to the porosity,spacing,and radius ratio.The underlying mechanisms involve energy dissipation,interference modulation,and geometric shielding,which collectively govern wave focusing,load variation,and energy attenuation within the system.Moreover,the arrangement and permeability of the inner cylinders play a crucial role in mitigating wave concentration and suppressing water accumulation in the gaps,thereby offering valuable implications for structural optimization.This work provides new insights into the hydrodynamic mechanisms of eccentric multi-cylinder systems and offers theoretical guidance for coastal protection,wave energy utilization,and offshore foundation design. 展开更多
关键词 wave-structure interaction wave diffraction eccentric multi-cylinder system wave loads
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Crystallographic slips and twinning activity in AZ31 magnesium alloy during different modes of deformation on the basis of diffraction experiment and modelling 认领 引用
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作者 A.Ludwik M.Wroński +5 位作者 P.Kot A.Baczmański S.Wroński K.Wierzbanowski G.Farkas K.Máthis 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第1期351-379,共29页
This study investigates the plastic deformation behaviour of the AZ31 magnesium alloy under various uniaxial loading conditions using in-situ neutron diffraction,the crystallite group method(CGM),and crystal plasticit... This study investigates the plastic deformation behaviour of the AZ31 magnesium alloy under various uniaxial loading conditions using in-situ neutron diffraction,the crystallite group method(CGM),and crystal plasticity modelling.A key novelty of this work is the direct,model independent determination of resolved shear stress(RSS)values for individual slip and twinning systems,as well as their critical values(CRSS),derived from lattice strains in grains with preferred orientations.The experiment was extended beyond the conventional loading paths along the normal direction(ND)and rolling direction(RD)to include compression at angles of 30°and 60°from the ND(referred to as NDC30 and NDC60 tests),which had not been investigated in previous studies.Notably,the NDC30 test,combined with diffraction measurements,was specifically designed to activate basal slip in the majority of grains while minimizing twinning,enabling clear identification of this slip system and accurate determination of its CRSS.For the first time,hardening parameters were determined by comparing the model predicted values of RSS with those obtained from diffraction measurements for each active system.These data,together with the results of macroscopic tests,were used to calibrate an elastic-plastic self-consistent(EPSC)model,which accurately reproduced stress partitioning under applied load,texture evolution,and twin activity.The integrated methodology enhances the reliability of CRSS input and improves the modelling of anisotropic plasticity in magnesium alloys by tuning intergranular interactions based on a modified Eshelby inclusion approach. 展开更多
关键词 Magnesium alloy Crystallographic slip Twinning Critical resolved shear stress Elastic-plastic self-consistent model Neutron diffraction
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Elucidation of the CO2 adsorption mechanism of [Zn2(mtz)2(ox)]using neutron powder diffraction 认领 引用
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作者 Lingxiang Bao Jing-Hong Li +12 位作者 Rui-Biao Lin Jianyuan Wu Zhenhong Tan Wu Xie Wenhai Ji Dong Zhang Anucha Koedtruad Jingjing Ma Wang Hay Kan Feng Pan Toru Ishigaki Takashi Kamiyama Ping Miao 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第5期784-787,共4页
Metal-organic framework[Zn2(tz)2(ox)](CALF-20)has attracted great attention due to its excellent ability to capture carbon dioxide.There are great interests to develop similar adsorbents for gas adsorption and s... Metal-organic framework[Zn2(tz)2(ox)](CALF-20)has attracted great attention due to its excellent ability to capture carbon dioxide.There are great interests to develop similar adsorbents for gas adsorption and separation.To develop more efficient porous adsorbent,it is essential to study the relationship between these structures and properties.Neutron diffraction has been proved to be an excellent tool for determining both the structural details of MOF host and the precise locations of adsorbed gas within the pore,offering unique opportunities for understanding the structure-properties relationship.Herein,we report the synthesis and structure characterization of MOF[Zn2(mtz)2(ox)],which exhibits high CO2adsorption capacity.Neutron powder diffraction experiment on the solvated,the activated and CO2loaded samples unveils the preferred binding sites of CO2within the MOFs,where CO2locates toward the center of the pore and interacts with methyl group or triazole via C–H···O hydrogen bonding.The adsorption process of CO2in[Zn2(mtz)2(ox)]is accompanied by the cell volume expansion,so[Zn2(mtz)2(ox)]with more compact structure can show a better adsorption performance.The structure-properties relationship in[Zn2(mtz)2(ox)]elucidated by present study offer a path to develop more advanced porous physisorbent materials. 展开更多
关键词 MOFs Adsorption site Neutron powder diffraction CO₂adsorption Structure–property relationship
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Crystal Structure Solution of Radiation-Sensitive Porous Framework CL30 by Low-Dose Cryo 3D Electron Diffraction 认领 引用
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作者 Ke Wang Dapeng Sun +5 位作者 Penghe Li Zhiyuan Mao Yi Luo Hongxia Wang Hongyi Xu Yumei Wang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第3期294-299,共6页
To overcome the limitations of traditional single-crystal X-ray diffraction(SCXRD)for microcrystalline materials and the peak-overlapping issue of powder X-ray diffraction(PXRD),this study employed cryogenic continuou... To overcome the limitations of traditional single-crystal X-ray diffraction(SCXRD)for microcrystalline materials and the peak-overlapping issue of powder X-ray diffraction(PXRD),this study employed cryogenic continuous rotation electron diffraction(cryo-cRED)with a low-dose strategy to determine the crystal structure of CL30,a novel silicogermanate framework.It is confirmed that CL30 crystallizes in the C2/m space group and has layered topology composed of discontinuous zigzag chains connected by double four-membered ring(d4r)units,with fluoride anions(F-)occluded in the d4r units.In CL30,charge balance involves organic structure-directing agent(OSDA)cations,occluded F-,and terminal oxygen sites whose protonation state cannot be established from the present three dimensional(3D)ED data.F-encapsulated in the d4r units contributes to charge compensation as the counter-anion to OSDA cations,rather than only balancing the framework charge.Although the refinement indices(R1=0.29,wR2=0.71)exceeded typical small-molecule crystallography standards,the structural model remained highly reliable,as supported by geometric restraints and validation.In electron diffraction,elevated R1 values are commonly attributed to the intrinsic factors of the technique,such as dynamic scattering,detector noise from scintillator-based detectors,and TEM stage instability(large spheres of confusion).This study introduces a new structural prototype to the silicogermanate family and establishes a feasible workflow for determining the structures of radiation-sensitive microcrystalline porous materials. 展开更多
关键词 discontinuous zigzag chains low dose cryo d electron diffraction c m space group crystal structure radiation sensitive porous framework silicogermanate layered topology silicogermanate frameworkit
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Mode and orbital angular momentum controlling of nonlocal solitons by anisotropic diffraction 认领 引用
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作者 Junying Zhu Qing Wang Jianning Wei 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第4期411-416,共6页
This study presents a novel approach to control the mode transform between Laguerre-Gaussian solitons and Hermite-Gaussian solitons by designing anisotropic diffraction in nonlocal medium.The anisotropic diffraction c... This study presents a novel approach to control the mode transform between Laguerre-Gaussian solitons and Hermite-Gaussian solitons by designing anisotropic diffraction in nonlocal medium.The anisotropic diffraction can introduce differential phase shifts and amplitude modulations to the optical field,and then leading to the transform of the soliton mode from one to another,while the accompanying orbital angular momentum exhibits a periodic variation.When the anisotropic diffraction is designed to become isotropic at the desired distance,various mode solitons with different rotation speeds and directions can be generated,which implies that the mode transform process and the change law of orbital angular momentum can be controlled.This finding establishes a versatile platform for nonlinear mode transform,offering new possibilities for applications in optical signal processing,topological photonics,optical micro-manipulation,and so on. 展开更多
关键词 anisotropic diffraction nonlocal solitons mode transform orbital angular momentum controlling
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Independent sampling and padding for Rayleigh-Sommerfeld diffraction based on scaled convolution approach 认领 引用
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作者 YANG Chen FU Xi-hong +1 位作者 FU Xin-peng BAYANHESHIG 《中国光学（中英文）》 EI CAS CSCD 北大核心 2026年第2期367-381,共15页
We propose a novel fast numerical calculation method for the Rayleigh-Sommerfeld diffraction integral,which is developed based on the existing scaled convolution method.This approach enables fast cal-culations for gen... We propose a novel fast numerical calculation method for the Rayleigh-Sommerfeld diffraction integral,which is developed based on the existing scaled convolution method.This approach enables fast cal-culations for general cases of off-axis scenarios where the sampling intervals and numbers of the input and observation planes are unequal.Additionally,it allows for arbitrary adjustment of the sampling interval of the impulse response function,facilitating a manual trade-off between computational load and accuracy.The er-rors associated with this method,which is equivalent to interpolation,primarily arise from the discontinuities of the sampling matrix of the impulse response function on its boundaries of periodic extension.To address this issue,we propose the concept of the padding function and its construction method,and evaluate its ef-fectiveness in enhancing computational accuracy.The feasibility of the proposed method is verified by nu-merical simulation and compared with the direct integration DI-method in a simplified scenario.It shows that the proposed method has good computational accuracy for the general case where the sampling interval of the input and observation plane is not equal under non-near-field diffraction,and when the diffraction distance is large,although the computational accuracy of the proposed method cannot exceed that of the DI-method,the computational amount can be significantly reduced with almost no effect on the computational accuracy.This method provides a general numerical calculation scheme of diffraction in the non-near field case for areas such as computational holography. 展开更多
关键词 Rayleigh-Sommerfeld diffraction scaled convolution padding function
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Surpassing the diffraction limit in long-range laser engineering via cross-scale vectorial optical field manipulation:perspectives and outlooks 认领 引用 被引量：2
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作者 Yinghui Guo Mingbo Pu +2 位作者 Yang Li Mingfeng Xu Xiangang Luo 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2025年第12期1-10,共10页
We present a vectorial optical field(VOF) framework that surpasses the diffraction limit in both long-range imaging and energy delivery. By jointly engineering spatial and temporal dimensions, reflective Fourier ptych... We present a vectorial optical field(VOF) framework that surpasses the diffraction limit in both long-range imaging and energy delivery. By jointly engineering spatial and temporal dimensions, reflective Fourier ptychography is extended to 3.2 km with 0.37× the classical diffraction limit, while a single-photon Li DAR tomography system achieves centimeter-scale, sub-diffraction imaging at 3.3 km using superconducting nanowire single-photon detectors. These advances demonstrate super-resolution, turbulence-resilient imaging over kilometer-range distances. Beyond super-resolution optical, high power VOFs are able to counteract thermal blooming during atmospheric laser propagation, enhancing on-target power density by a factor larger than 2. Together, these results may outline a cross-scale paradigm that links highpower vector-field structuring, single-photon detection, and adaptive control-offering a pathway toward next-generation optical systems that integrate imaging, sensing, communication and directed energy within a common physical framework. 展开更多
关键词 generalized diffraction limit cross-scale vectorial optical field manipulation sub-diffraction-limited imaging laser wireless power transfer laser-induced atmosphere engineering
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Diffraction classification imaging using coordinate attention enhanced DenseNet 认领 引用
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作者 Tong-Jie Sheng Jing-Tao Zhao +2 位作者 Su-Ping Peng Zong-Nan Chen Jie Yang 《Petroleum Science》 SCIE EI CAS CSCD 2025年第6期2353-2383,共31页
In oil and gas exploration,small-scale karst cavities and faults are important targets.The former often serve as reservoir space for carbonate reservoirs,while the latter often provide migration pathways for oil and g... In oil and gas exploration,small-scale karst cavities and faults are important targets.The former often serve as reservoir space for carbonate reservoirs,while the latter often provide migration pathways for oil and gas.Due to these differences,the classification and identification of karst cavities and faults are of great significance for reservoir development.Traditional seismic attributes and diffraction imaging techniques can effectively identify discontinuities in seismic images,but these techniques do not distinguish whether these discontinuities are karst cavities,faults,or other structures.It poses a challenge for seismic interpretation to accurately locate and classify karst cavities or faults within the seismic attribute maps and diffraction imaging profiles.In seismic data,the scattering waves are associated with small-scale scatters like karst cavities,while diffracted waves are seismic responses from discontinuous structures such as faults,reflector edges and fractures.In order to achieve classification and identification of small-scale karst cavities and faults in seismic images,we propose a diffraction classification imaging method which classifies diffracted and scattered waves in the azimuth-dip angle image matrix using a modified DenseNet.We introduce a coordinate attention module into DenseNet,enabling more precise extraction of dynamic and azimuthal features of diffracted and scattered waves in the azimuth-dip angle image matrix.Leveraging these extracted features,the modified DenseNet can produce reliable probabilities for diffracted/scattered waves,achieving high-accuracy automatic classification of cavities and faults based on diffraction imaging.The proposed method achieves 96%classification accuracy on the synthetic dataset.The field data experiment demonstrates that the proposed method can accurately classify small-scale faults and scatterers,further enhancing the resolution of diffraction imaging in complex geologic structures,and contributing to the localization of karstic fracture-cavern reservoirs. 展开更多
关键词 Diffraction imaging Diffraction classification Azimuth-dip angle image matrix Coordinate attention DenseNet
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Controllable two-dimensional asymmetric diffraction grating via vortex light in a semiconductor double quantum wells system 认领 引用 被引量：1
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作者 Kunpeng Zhao Duo Zhang +1 位作者 Junbing Guo Jiaqian Li 《Communications in Theoretical Physics》 SCIE CAS CSCD 2025年第8期49-58,共10页
We present a theoretical scheme to realize two-dimensional(2D)asymmetric diffraction grating in a five-level inverted Y-type asymmetric double semiconductor quantum wells(SQWs)structure with resonant tunneling.The SQW... We present a theoretical scheme to realize two-dimensional(2D)asymmetric diffraction grating in a five-level inverted Y-type asymmetric double semiconductor quantum wells(SQWs)structure with resonant tunneling.The SQW structure interacts with a weak probe laser field,a spatially independent 2D standing-wave(SW)field,and a Laguerre–Gaussian(LG)vortex field,respectively.The results indicate that the diffraction patterns are highly sensitive to amplitude modulation and phase modulation.Because of the existence of vortex light,it is possible to realize asymmetric high-order diffraction in the SQW structure,and then a 2D asymmetric grating is established.By adjusting the detunings of the probe field,vortex field,and SW field,as well as the interaction length,diffraction intensity,and direction of the 2D asymmetric electromagnetically induced grating(EIG)can be controlled effectively.In addition,the number of orbital angular momenta(OAM)and beam waist parameter can be used to modulate the diffraction intensity and energy transfer of the probe light in different regions.High-order diffraction intensity is enhanced and high-efficiency 2D asymmetric diffraction grating with different diffraction patterns is obtained in the scheme.Such 2D asymmetric diffraction grating may be beneficial to the research of optical communication and innovative semiconductor quantum devices. 展开更多
关键词 asymmetric diffraction grating standing-wave field laguerre-gaussian vortex field diffraction property semiconductor quantum well
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Sub-Diffraction Limit Quantum Metrology for Nanofabrication 认领 引用 被引量：1
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作者 Wenyi Ye Yang Li +10 位作者 Lianwei Chen Mingbo Pu Zheting Meng Yuanjian Huang Hengshuo Guo Xiaoyin Li Yinghui Guo Xiong Li Yun Long Emmanuel Stratakis Xiangang Luo 《Engineering》 SCIE EI CSCD 2025年第6期96-103,共8页
Optical monitoring of object position and alignment with nanoscale precision is critical for ultra-precision measurement applications,such as microano-fabrication,weak force sensing,and micro-scopic imaging.Traditiona... Optical monitoring of object position and alignment with nanoscale precision is critical for ultra-precision measurement applications,such as microano-fabrication,weak force sensing,and micro-scopic imaging.Traditional optical nanometry methods often rely on precision nanostructure fabrication,multi-beam interferometry,or complex post-processing algorithms,which can limit their practical use.In this study,we introduced a simplified and robust quantum measurement technique with an achievable resolution of 2.2 pm and an experimental demonstration of 1 nm resolution,distinguishing it from conventional interferometry,which depended on multiple reference beams.We designed a metasurface substrate with a mode-conversion function,in which an incident Gaussian beam is converted into higher-order transverse electromagnetic mode(TEM)modes.A theoretical analysis,including calculations of the Fisher information,demonstrated that the accuracy was maintained for nanoscale displacements.In conclusion,the study findings provide a new approach for precise alignment and metrology of nanofabrication and other advanced applications. 展开更多
关键词 Nanofabrication Precision measurement Diffraction limit Quantum metrology
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Polarization-sensitive nonlinear optical diffraction 认领 引用
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作者 Jianluo Chen Lihong Hong +2 位作者 Yu Zou Jiacheng Li Zhi-Yuan Li 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第6期350-355,共6页
When a laser beam is incident on a nonlinear grating with a laterally modulated second-order nonlinear coefficient,nonlinear diffraction of the noncollinear second-harmonic generation(SHG)signal occurs,with Raman–Nat... When a laser beam is incident on a nonlinear grating with a laterally modulated second-order nonlinear coefficient,nonlinear diffraction of the noncollinear second-harmonic generation(SHG)signal occurs,with Raman–Nath nonlinear diffraction(NRND)being a prominent example.As these SHG NRND processes involve coupling between the fundamental-wave pump laser vectorial field and the SHG laser vectorial field through the second-order nonlinearity secondrank tensor of the nonlinear crystal,the nonlinear interaction between light and the nonlinear grating can be manipulated by adjusting the polarization state of the pump laser.In this paper,we derive the relationship between the polarization state of the incident light and the generated nonlinear diffraction signal based on the nonlinear coupled wave equation and experimentally validate the predicted diffraction characteristics.The results show that the optical properties of each order of NRND are highly sensitive to the polarization angle of the incident pump laser beam. 展开更多
关键词 Raman–Nath nonlinear diffraction(NRND) nonlinear diffraction polarization
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Temperature-dependent deformation behavior of dual-phase medium-entropy alloy:In-situ neutron diffraction study 认领 引用
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作者 Gang Hee Gu Sang Guk Jeong +8 位作者 Yoon-Uk Heo Hyojeong Ha Soung Yeoul Ahn Ji Yeong Lee Jungwan Lee Stefanus Harjo Wu Gong Jungwook Cho Hyoung Seop Kim 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第20期308-324,共17页
Face-centered cubic(FCC)equi-atomic multi-principal element alloys(MPEAs)exhibit excellent mechan-ical properties over a broad temperature range from cryogenic temperatures(CTs)to room temperature(RT).Specifically,whi... Face-centered cubic(FCC)equi-atomic multi-principal element alloys(MPEAs)exhibit excellent mechan-ical properties over a broad temperature range from cryogenic temperatures(CTs)to room temperature(RT).Specifically,while the deformation mechanism is dominated solely by dislocation slip at RT,the re-duction in stacking fault energy(SFE)at CTs leads to enhanced strain hardening with deformation twin-ning.This study employs in-situ neutron diffraction to reveal the temperature-dependent deformation be-havior of the FCC/body-centered cubic(BCC)dual-phase(DP)Al7(CoNiV)93 medium-entropy alloy(MEA),which possesses a matrix exhibiting deformation behavior analogous to that of representative equi-atomic MPEAs.Alongside the increased lattice friction stress associated with reduced temperature as a thermal component,deformation twinning at liquid nitrogen temperature(LNT)facilitates dislocation activity in the FCC matrix,leading to additional strain hardening induced by the dynamic Hall-Petch effect.This would give the appearance that the improved strengthening/hardening behaviors at LNT,compared to RT,are primarily attributable to the FCC phase.In contrast,the BCC precipitates are governed solely by dislocation slip for plastic deformation at both 77 K and 298 K,exhibiting a similar trend in dislocation density evolution.Nevertheless,empirical and quantitative findings indicate that the intrinsically high Peierls-Nabarro barriers in the BCC precipitates exhibit pronounced temperature-dependent lattice fric-tion stress,suggesting that the BCC precipitates play a more significant role in the temperature-dependent strengthening/hardening behaviors for the DP-MEA.This study provides a comprehensive understanding of deformation behavior by thoroughly analyzing temperature-dependent strengthening/hardening mech-anisms across various DP-MPEA systems,offering valuable guidelines for future alloy design. 展开更多
关键词 In-situ neutron diffraction Medium-entropy alloy Dual-phase microstructure Deformation behavior Mechanical properties
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Solid solution dependence of the deformation behavior in Mg-xZn(x=0,1,2 wt%)alloys:In-situ neutron diffraction and crystal plasticity modeling 认领 引用
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作者 Huai Wang Soo Yeol Lee +3 位作者 You Sub Kim Huamiao Wang Wanchuck Woo Ke An 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第2期823-838,共16页
The effects of solid solution on the deformation behavior of binary Mg-xZn(x=0,1,2 wt%)alloys featuring a designated texture that enables extension twinning under tension parallel to the basal pole in most grains,were... The effects of solid solution on the deformation behavior of binary Mg-xZn(x=0,1,2 wt%)alloys featuring a designated texture that enables extension twinning under tension parallel to the basal pole in most grains,were investigated using in-situ neutron diffraction and the EVPSC-TDT model.Neutron diffraction was used to quantitatively track grain-level lattice strains and diffraction intensity changes(related to mechanical twinning)in differently oriented grains of each alloy during cyclic tensile/compressive loadings.These measurements were accurately captured by the model.The stress-strain curves of Mg-1 wt%Zn and Mg-2 wt%Zn alloys show as-expected solid solution strengthening from the addition of Zn compared to pure Mg.The macroscopic yielding and hardening behaviors are explained by alternating slip and twinning modes as calculated by the model.The solid solution's influence on individual deformation modes,including basal〈a〉slip,prismatic〈a〉slip,and extension twinning,was then quantitatively assessed in terms of activity,yielding behavior,and hardening response by combining neutron diffraction results with crystal plasticity predictions.The Mg-1 wt%Zn alloy displays distinct yielding and hardening behavior due to solid solution softening of prismatic〈a〉slip.Additionally,the dependence of extension twinning,in terms of the twinning volume fraction,on Zn content exhibits opposite trends under tensile and compressive loadings. 展开更多
关键词 Magnesium alloy Deformation behavior Solid solution Crystal plasticity modeling Neutron diffraction
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Tension-compression asymmetry of an AM magnesium alloy unveiled by in-situ synchrotron X-ray diffraction 认领 引用
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作者 Hao Chen Huicong Chen +6 位作者 Yuanding Huang Weimin Gan Emad Maawad Weidong Xie Guobing Wei Yan Yang Yu Zou 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第11期5421-5437,共17页
Magnesium(Mg)alloys typically exhibit anisotropic mechanical behaviors due to their hexagonal close-packed(hcp)crystal structures,often leading to tension-compression asymmetries.Understanding of the asymmetrical and ... Magnesium(Mg)alloys typically exhibit anisotropic mechanical behaviors due to their hexagonal close-packed(hcp)crystal structures,often leading to tension-compression asymmetries.Understanding of the asymmetrical and related deformation mechanisms is crucial for their structural applications,particularly in the lightweight transportation industries.Nevertheless,the underlying deformation mechanisms(e.g.,slip versus twinning)at each deformation stage during tension and compression have not been fully understood.In this study,we employed tensile and compressive tests on extruded Al and Mn containing Mg alloy,i.e.,an AM alloy Mg-0.6Mn-0.5Al-0.5Zn-0.4Ca,during the synchrotron X-ray diffraction.Our results show that distinct deformation behaviors and mechanisms in tension and compression are associated with the strong texture in the extruded samples:(i)The tensile deformation is dominated by dislocation slips,with activation of non-basalandslip,but deformation twinning is suppressed.(ii)The compressive deformation shows early-stage tensile twinning,followed by dislocation slips.Twinning induces grain reorientation,leading to significant lattice strain evolution aligned with the texture.The pronounced tension-compression asymmetry is attributed to the favorable shear stress direction formed in the twinning system during compression,which facilitates the activation of tensile twins.During tension,the strain hardening rate(SHR)drops significantly after yielding due to limited activated slip systems.In contrast,the samples under compression exhibit significant increases in SHR after yielding.During compression,dislocation multiplication dominates the initial strain hardening,while twinning progressively contributes more significantly than dislocation slip at higher strains.This study improves our understanding of the tension-compression and strain hardening asymmetries in extruded AM Mg alloys. 展开更多
关键词 Mg alloy Plastic deformation Dislocation Twinning Synchrotron X-ray diffraction
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Wafer-level perfect conformal contact lithography at the diffraction limit enabled by dry transferable photoresist 认领 引用
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作者 Yu Zhou Lei Chen +3 位作者 Zhiwen Shu Fu Fan Yueqiang Hu Huigao Duan 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2025年第6期426-434,共9页
Lithography is a Key enabling technique in modern microano scale technology.Achieving the optimal trade-off between resolution,throughput,and cost remains a central focus in the ongoing development.However,current lit... Lithography is a Key enabling technique in modern microano scale technology.Achieving the optimal trade-off between resolution,throughput,and cost remains a central focus in the ongoing development.However,current lithographic techniques such as direct-write,projection,and extreme ultraviolet lithography achieve higher resolution at the expense of increased complexity in optical systems or the use of shorter-wavelength light sources,thus raising the overall cost of production.Here,we present a cost-effective and wafer-level perfect conformal contact lithography at the diffraction limit.By leveraging a transferable photoresist,the technique ensures optimal contact between the mask and photoresist with zero-gap,facilitating the transfer of patterns at the diffraction limit while maintaining high fidelity and uniformity across large wafers.This technique applies to a wide range of complex surfaces,including non-conductive glass surfaces,flexible substrates,and curved surfaces.The proposed technique expands the potential of contact photolithography for novel device architectures and practic al manufacturing processes. 展开更多
关键词 perfect conformal contact lithography diffraction limit conformal pattern transfer large-aperture metalens
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Quasi-in situ electron backscatter diffraction analysis of twinning±detwinning behavior in AZ31 magnesium-alloy rolled plates subjected to compression loading in different directions 认领 引用
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作者 Le Zhou Guiyuan Ren +5 位作者 Tianqi Huang Zhi Wang Feng Wang Ziqi Wei Pingli Mao Zheng Liu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第5期2358-2373,共16页
In this study,the twinning-detwinning behavior and slip behavior of rolled AZ31 magnesium-alloy plates during a three-step intermittent dynamic compression process along the rolling direction(RD)and normal direction(N... In this study,the twinning-detwinning behavior and slip behavior of rolled AZ31 magnesium-alloy plates during a three-step intermittent dynamic compression process along the rolling direction(RD)and normal direction(ND),are investigated via quasi-in situ electron backscatter diffraction,and the causes of the twinning and detwinning behavior are explained according to Schmid law,local strain coordination,and slip trajectories.It is found that the twins are first nucleated and grow at a compressive strain of 3%along the RD.In addition to the Schmid factor(SF),the strain coordination factor(m’)also influences the selection of the twin variants during the twinning process,resulting in the nucleation of twins with a low SF.During the second and third steps of the application of continuous compressive strains with magnitudes and directions of 3%RD+3%ND and 3%RD+3%ND+2.5%ND,detwinning occurs to different extents.The observation of the detwinning behavior reveals that the order in which multiple twins within the same grain undergo complete detwinning is related to Schmid law and the strain concentration,with a low SF and a high strain concentration promoting complete detwinning.The interaction between slip dislocations and twin boundaries in the deformed grains as well as the pinning of dislocations at the tips of the {1012} tensile twins with a special structure result in incomplete detwinning.Understanding the microstructural evolution and twinning behavior of magnesium alloys under different deformation geometries is important for the development of high-strength and high-toughness magnesium alloys. 展开更多
关键词 Quasi-in situ electron backscatter diffraction Twinning and detwinning Schmid law Strain coordination
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High-speed and low-latency optical feature extraction engine based on diffraction operators 认领 引用
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作者 Run Sun Yuemin Li +5 位作者 Tingzhao Fu Yuyao Huang Wencan Liu Zhenmin Du Sigang Yang Hongwei Chen 《Advanced Photonics Nexus》 CSCD 2025年第5期133-143,共11页
Feature extraction in the optical domain offers a promising low-latency,high-throughput solution.Optical diffraction-based feature extraction operating under a coherent light source can further achieve parallel output... Feature extraction in the optical domain offers a promising low-latency,high-throughput solution.Optical diffraction-based feature extraction operating under a coherent light source can further achieve parallel outputs with low energy consumption.However,it presents significant challenges for maintaining the coherent input,scaling the operation rates beyond 10 GHz,and ensuring the effective extraction of functional configuration simultaneously.We propose an optical feature extraction engine(OFE2),which is composed of a diffraction operator and a data preparation module,powering high-speed feature extraction for both image and temporal series tasks.This OFE2can achieve a core latency of less than 250.5 ps;in addition,it can reach a throughput of 250 GOPS and an efficiency of 2.06 TOPS/W.Supported by the OFE2,a novel feature extraction paradigm is emerging,enabling high-speed,low-latency service access for applications in scene recognition,medical assistance,and digital finance. 展开更多
关键词 high-speed optical computing optical feature extraction diffraction operator
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Detecting dynamic structural evolution based on in-situ high-energy X-ray diffraction technology for sodium layered oxide cathodes 认领 引用
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作者 Yan-Jiang Li Shu-Lei Chou Yao Xiao 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第2期118-132,共15页
The detrimental phase transformations of sodium layered transition metal oxides(NaxTMO2)during desodiation/sodiation seriously suppress their practical applications for sodium ion batteries(SIBs).Undoubtedly,com... The detrimental phase transformations of sodium layered transition metal oxides(NaxTMO2)during desodiation/sodiation seriously suppress their practical applications for sodium ion batteries(SIBs).Undoubtedly,comprehensively investigating of the dynamic crystal structure evolutions of NaxTMO2associating with Na ions extraction/intercalation and then deeply understanding of the relationships between electrochemical performances and phase structures drawing support from advanced characterization techniques are indispensable.In-situ high-energy X-ray diffraction(HEXRD),a powerful technology to distinguish the crystal structure of electrode materials,has been widely used to identify the phase evolutions of NaxTMO2and then profoundly revealed the electrochemical reaction processes.In this review,we begin with the descriptions of synchrotron characterization techniques and then present the advantages of synchrotron X-ray diffraction(XRD)over conventional XRD in detail.The optimizations of structural stability and electrochemical properties for P2-,O3-,and P2/O3-type NaxTMO2cathodes through single/dual-site substitution,high-entropy design,phase composition regulation,and surface engineering are summarized.The dynamic crystal structure evolutions of NaxTMO2polytypes during Na ion extraction/intercalation as well as corresponding structural enhancement mechanisms characterizing by means of HEXRD are concluded.The interior relationships between structure/component of NaxTMO2polytypes and their electrochemical properties are discussed.Finally,we look forward the research directions and issues in the route to improve the electrochemical properties of NaxTMO2cathodes for SIBs in the future and the combined utilizations of multiple characterization techniques.This review will provide significant guidelines for rational designs of high-performance NaxTMO2cathodes. 展开更多
关键词 Layered oxides Sodium-ion batteries Phase evolutions In-situ high-energy X-ray diffraction Electrochemistry
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Depression of pyrrhotite superstructures in copper flotation:A synchrotron X-ray powder diffraction and DFT study 认领 引用 被引量：2
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作者 Alireza Rezvani Foad Raji +3 位作者 Rong Fan R.Kappes Zhiyong Gao Yongjun Peng 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2025年第8期1259-1270,共12页
Pyrrhotite naturally occurs in various superstructures including magnetic(4C)and non-magnetic(5C,6C)types,each with distinct physicochemical properties and flotation behaviors.Challenges in accurately identifying and ... Pyrrhotite naturally occurs in various superstructures including magnetic(4C)and non-magnetic(5C,6C)types,each with distinct physicochemical properties and flotation behaviors.Challenges in accurately identifying and quantifying these superstructures hinder the optimization of pyrrhotite depression in flotation processes.To address this critical issue,synchrotron X-ray powder diffraction(S-XRPD)with Rietveld refinement was employed to quantify the distribution of superstructures in the feed and flotation concentrates of a copper–gold ore.To elucidate the mechanisms influencing depression,density functional theory(DFT)calculations were conducted to explore the electronic structures and surface reactivity of the pyrrhotite superstructures toward the adsorption of water,oxygen and hydroxyl ions(OH-)as dominant species present in the flotation process.S-XRPD analysis revealed that flotation recovery rates of pyrrhotite followed the order of 4C<6C<5C.DFT calculations indicated that the Fe 3d and S 3p orbital band centers exhibited a similar trend relative to the Fermi level with 4C being the closest.The Fe3d band center suggested that the 4C structure possessed a more reactive surface toward the oxygen reduction reaction,promoting the formation of hydrophilic Fe-OH sites.The S 3p band center order also implied that xanthate on the non-magnetic 5C and 6C surfaces could oxidize to dixanthogen,increasing hydrophobicity and floatability,while 4C formed less hydrophobic metal-xanthate complexes.Adsorption energy and charge transfer analyses of water,hydroxyl ions and molecular oxygen further supported the high reactivity and hydrophilic nature of 4C pyrrhotite.The strong bonding with hydroxyl ions indicated enhanced surface passivation by hydrophilic Fe–OOH complexes,aligning with the experimentally observed flotation order(4C<6C<5C).These findings provide a compelling correlation between experimental flotation results and electronic structure calculations,delivering crucial insights for optimizing flotation processes and improving pyrrhotite depression.This breakthrough opens up new opportunities to enhance the efficiency of flotation processes in the mining industry. 展开更多
关键词 Pyrrhotite depression Synchrotron X-ray powder diffraction analysis Pyrrhotite superstructures DFT simulation Surface reactivity
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