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Dual nanoprecipitation and nanoscale chemical heterogeneity in a secondary hardening steel for ultrahigh strength and large uniform elongation 认领 引用 被引量：4
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作者 Shidong Wang Jinhua Wang +12 位作者 Shijie Zhang Daixiu Wei Yang Chen Xuequan Rong Wu Gong Stefanus Harjo Xiaochun Liu Zengbao Jiao Zhigang Yang Gang Sha Chunxu Wang Guang Chen Hao Chen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第18期245-258,共14页
Nanoprecipitates and nanoscale retained austenite(RA)with suitable stability play crucial roles in deter-mining the yield strength(YS)and ductility of ultrahigh strength steels(UHSSs).However,owing to the kinetics inc... Nanoprecipitates and nanoscale retained austenite(RA)with suitable stability play crucial roles in deter-mining the yield strength(YS)and ductility of ultrahigh strength steels(UHSSs).However,owing to the kinetics incompatibility between nanoprecipitation and austenite reversion,it is highly challenging to si-multaneously introduce high-density nanoprecipitates and optimized RA in UHSSs.In this work,through the combination of austenite reversion treatment(ART)and subsequent flash austenitizing(FA),nanoscale chemical heterogeneity was successfully introduced into a low-cost UHSS prior to the aging process.This chemical heterogeneity involved the enrichment of Mn and Ni in the austenite phase.The resulting UHSS exhibited dual-nanoprecipitation of Ni(Al,Mn)and(Mo,Cr)2C and nanoscale austenite stabilized via Mn and Ni enrichment.The hard martensitic matrix strengthened by high-density dual-nanoprecipitates con-strains the plastic deformation of soft RA with a relatively low fraction of-15%,and the presence of relatively stable nanoscale RA with adequate Mn and Ni enrichment leads to a marginal loss in YS but keeps a persistent transformation-induced plasticity(TRIP)effect.As a result,the newly-developed UHSS exhibits an ultrahigh YS of-1.7 GPa,an ultimate tensile strength(UTS)of-1.8 GPa,a large uniform elongation(UE)of-8.5%,and a total elongation(TE)of-13%.The strategy of presetting chemical heterogeneity to introduce proper metastable phases before aging can be extended to other UHSSs and precipitation-hardened alloys. 展开更多
关键词 Ultrahigh strength steels Dual-nanoprecipitation Austenite stability TRIP effect Phase transformation
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High-cycle Fatigue Fracture Behavior of Ultrahigh Strength Steels 认领 引用 被引量：3
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作者 Weijun HUI Yihong NIE +2 位作者 Han DONG Yuqing WENG Chunxu WANG 《Journal of Materials Science & Technology》 SCIE EI CAS 2008年第5期787-792,共6页
The fatigue fracture behavior of four ultrahigh strength steels with different melting processes and therefore different inclusion sizes were studied by using a rotating bar two-point bending fatigue machine in the hi... The fatigue fracture behavior of four ultrahigh strength steels with different melting processes and therefore different inclusion sizes were studied by using a rotating bar two-point bending fatigue machine in the high-cycle regime up to 107 cycles of loading. The fracture surfaces were observed by field emission scanning electron microscopy （FESEM）. It was found that the size of inclusion has significant effect on the fatigue behavior. For AtSI 4340 steel in which the inclusion size is smaller than 5.5 μm, all the fatigue cracks except one did not initiated from inclusion but from specimen surface and conventional S-N curve exists. For 65Si2MnWE and Aermet 100 steels in which the average inclusion sizes are 12.2 and 14.9 μm, respectively, fatigue cracks initiated from inclusions at lower stress amplitudes and stepwise S-N curves were observed. The S-N curve displays a continuous decline and fatigue failures originated from large oxide inclusion for 60Si2CrVA steel in which the average inclusion size is 44.4 pro. In the case of internal inclusion-induced fractures at cycles beyond about 1×10^6 for 65Si2MnWE and 60Si2CrVA steels, inclusion was always found inside the fish-eye and a granular bright facet （GBF） was observed in the vicinity around the inclusion. The GBF sizes increase with increasing the number of cycles to failure Nf in the long-life regime. The values of stress intensity factor range at crack initiation site for the GBF are almost constant with Nf, and are almost equal to that for the surface inclusion and the internal inclusion at cycles lower than about 1×10^6. Neither fish-eye nor GBF was observed for Aermet 100 steel in the present study. 展开更多
关键词 High-cycle fatigue Ultrahigh strength steel Inclusion S-N curve Fish-eye fracture
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基于流固耦合方法的两自由度水翼流激振动特性研究 认领 引用 被引量：1
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作者 姜宜辰 王传晟 +2 位作者 李劲光 王春旭 王晴 《哈尔滨工程大学学报（英文版）》 CSCD 2023年第4期775-794,共20页
The flutter of a hydrofoil can cause structural damage and failure,which is a dangerous situation that must be avoided.In this work,based on computational fluid dynamics and structural finite element methods,a co-simu... The flutter of a hydrofoil can cause structural damage and failure,which is a dangerous situation that must be avoided.In this work,based on computational fluid dynamics and structural finite element methods,a co-simulation framework for the flow-induced vibration of hydrofoil was established to realize fluid-structure interaction.Numerical simulation research was conducted on the flow-induced vibration characteristics of rigid hydrofoil with 2-DOF under uniform flow,and the heave and pitch vibration responses of hydrofoil were simulated.The purpose is to capture the instability of hydrofoil vibration and evaluate the influence of natural frequency ratio and inertia radius on vibration state to avoid the generation of flutter.The results indicate that when the inflow velocity increases to a certain critical value,the hydrofoil will enter the flutter critical state without amplitude attenuation.The attack angle of a hydrofoil has a significant impact on the vibration amplitude of heave and pitch.Additionally,the natural frequency ratio and inertia radius of the hydrofoil significantly affect the critical velocity of the flutter.Adjusting the natural frequency ratio by reducing the vertical stiffness or increasing the pitch stiffness can move the vibration from a critical state to a convergent state. 展开更多
关键词 Hydrofoil Flutter Flow-induced vibration Fluid-structure interaction Critical velocity
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Topological magnetotransport and electrical switching of sputtered antiferromagnetic Ir20Mn80 认领 引用
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作者 熊丹荣 蒋宇昊 +7 位作者 朱道乾 杜奥 郭宗夏 卢世阳 王春旭 夏清涛 朱大鹏 赵巍胜 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第5期648-654,共7页
Topological magnetotransport in non-collinear antiferromagnets has attracted extensive attention due to the exotic phenomena such as large anomalous Hall effect(AHE),magnetic spin Hall effect,and chiral anomaly.The ma... Topological magnetotransport in non-collinear antiferromagnets has attracted extensive attention due to the exotic phenomena such as large anomalous Hall effect(AHE),magnetic spin Hall effect,and chiral anomaly.The materials exhibiting topological antiferromagnetic physics are typically limited in special Mn_3X family such as Mn_3Sn and Mn_3Ge.Exploring the topological magnetotransport in common antiferromagnetic materials widely used in spintronics will not only enrich the platforms for investigating the non-collinear antiferromagnetic physics,but also have great importance for driving the nontrivial topological properties towards practical applications.Here,we report remarkable AHE,anisotropic and negative parallel magnetoresistance in the magnetron-sputtered Ir20Mn80antiferromagnet,which is one of the most widely used antiferromagnetic materials in industrial spintronics.The ab initio calculations suggest that the Ir_4Mn16(IrMn_4)or Mn_3Ir nanocrystals hold nontrivial electronic band structures,which may contribute to the observed intriguing magnetotransport properties in the Ir20Mn80.Further,we demonstrate the spin–orbit torque switching of the antiferromagnetic Ir20Mn80by the spin Hall current of Pt.The presented results highlight a great potential of the magnetron-sputtered Ir20Mn80film for exploring the topological antiferromagnet-based physics and spintronics applications. 展开更多
关键词 non-collinear antiferromagnets anomalous Hall effect magnetization switching spin–orbit torque
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Efficient on-chip waveguide amplifiers in GeSbS-loaded etchless erbium-doped lithium niobate thin film 认领 引用 被引量：1
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作者 CHUNXU WANG JINGCUI SONG +7 位作者 ZHAOHUAN AO YINGYU CHEN YONGGUANG XIAO YIFAN ZHANG QINGMING CHEN XINGWEN YI XUEYANG LI ZHAOHUI Li 《Photonics Research》 SCIE EI CAS CSCD 2025年第6期1674-1679,共6页
In this paper,an efficient Ge25Sb10S65(GeSbS)-loaded erbium-doped lithium niobate waveguide amplifier is demonstrated.By dimensional optimization of the waveguide,an internal net gain of approximately 28 dB a... In this paper,an efficient Ge25Sb10S65(GeSbS)-loaded erbium-doped lithium niobate waveguide amplifier is demonstrated.By dimensional optimization of the waveguide,an internal net gain of approximately 28 dB and a maximum on-chip output power of 8.2 dBm are demonstrated upon 1480 nm bidirectional pumping.Due to the improved optical mode field distribution within the active erbium-doped lithium niobate film and the mode overlap ratio between the pump and signal sources,a 15% high conversion efficiency can be achieved at a modest pump power of 45 mW.Furthermore,the noise figure of the amplifier can be maintained below 6 dB for low-input-signal power levels.Compared to state-of-the-art erbium-doped waveguide amplifiers(EDWAs),this heterogeneously integrated device shows superior gain performance at the desired optical C-band while avoiding the complex plasma etching process of lithium niobate,providing an inspirative solution for power compensation in the optical telecommunications. 展开更多
关键词 chip waveguide amplifiers internal net gain gesbs loaded erbium doped lithium niobate dimensional optimization chip output power dimensional optimization waveguidean waveguide amplifier
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A general approach to qualitatively and graphically characterize the diffuse behavior of interstitial nonmetallic atoms in multiprincipal element alloys based on site preference 认领 引用
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作者 Yang Qiao Xingyu Chen +12 位作者 Bo Wu Jiawen Sun Jiaming Huang Xiangyan Su Xiaolin Zhou Xiaoqiong Zhang Xuan Fang Yan Zhao Baisheng Sa Ming Liu Yu Liu Chunxu Wang Frank Vrionis 《Materials Genome Engineering Advances》 CAS CSCD 2025年第3期114-128,共15页
It is urgent to establish a series of reasonable and general approaches to qualitatively and graphically characterize the four core effects of multi-principal element alloys(MPEAs)based on the inherent site preference... It is urgent to establish a series of reasonable and general approaches to qualitatively and graphically characterize the four core effects of multi-principal element alloys(MPEAs)based on the inherent site preference.In this contribution,a qualitatively and graphically characterizing approach to the diffusion behavior of interstitial nonmetallic atoms diffusing along the neighboring octahedra in MPEAs was explored intensively.For this purpose,the C atom diffusing along the neighboring octahedra in FCC_CoNiV MPEA with(V1.0000)1a(Co0.4445Ni0.4444V0.1111)3c,a constant ordered occupying configuration predicted in our previous paper,was demonstrated in detail.Six distinct diffusion paths along[110],[101],and[011]directions on XY,XZ,and YZ planes of FCC_CoNiV MPEA with forward and backward diffusion directions were explored one by one,respectively.The diffusion energy barrier,diffusion coefficient,diffusion constant,and activation energy were derived by employing first-principles calculations based on density functional theory alongside the Climbing Image Nudged Elastic Band method.Unlike diffusing behavior in pure metallic elements,the non-periodic diffusion energy barrier waves are revealed for the real FCC_CoNiV MPEA structure.The significant variations in the diffusion energy barriers are influenced by the atomic environment,particularly the interaction between V and C atoms,which enhances the localization of electrons and increases the overall diffusion energy barrier.The energy barriers show similar trends along six paths,but significant variations occur across different octahedral sites. 展开更多
关键词 computational materials science interstitial atom diffusing behaviors multi-principal element alloys(MPEAs) non-cyclical diffusion energy barrier waves site preference
High-efficiency Brillouin lasing in a planar GeSbS spiral-ring resonator 认领 引用
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作者 Jingcui Song Yuhang Wei +5 位作者 Chunxu Wang Shuixian Yang Yan Li Tianhua Feng Xiaojie Guo Zhaohui Li 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第7期71-76,共6页
Stimulated Brillouin scattering in planar integrated circuits promises to realize compact and highly coherent lasers.Here we report efficient Brillouin lasing at telecommunication wavelength from a planar Ge25Sb_(1... Stimulated Brillouin scattering in planar integrated circuits promises to realize compact and highly coherent lasers.Here we report efficient Brillouin lasing at telecommunication wavelength from a planar Ge25Sb10S65 chalcogenide(ChG)resonator with a high quality factor above 106.A low lasing threshold of 24.8 mW is achieved with a slope efficiency of 8.3%.An 8-kHz linewidth is measured for 1.56-mW on-chip output power.This work offers a good opportunity to enrich the versatility and functionality of the ChG photonics on account of their intrinsic advantages of low loss,high third-order nonlinearity,and potential capacity for wafer-scale fabrication. 展开更多
关键词 Brillouin lasing chalcogenide photonics planar integrated circuit high-Q resonator
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The early signal substances induced by heat stress in brains of mice 认领 引用
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作者 Chunxu WANG Hanxing WANG 《Frontiers of Medicine》 2008年第4期391-395,共5页
To study the effects of early signal substances induced by heat stress in brains of Kunming mice,six-month-old mice(n 572)were pretreated with heat stress and subsequent ischemiaeperfusion by clipping of their bilater... To study the effects of early signal substances induced by heat stress in brains of Kunming mice,six-month-old mice(n 572)were pretreated with heat stress and subsequent ischemiaeperfusion by clipping of their bilateral cervical common arteries for 7 min.According to different treatments,animals were randomly divided into four groups:(1)normal control group;(2)heat stress pre-treatment followed by ischemia and reperfusion group(HS/IR);(3)ischemia and reperfusion group(IR);(4)heat stress group(HS).Animals in the later three groups were subdivided into 3 subgroups(1 day,4 days,14 days),respectively.The changes in the expression of cAMP res-ponse element binding protein(CREB)and calcitonin gene-related peptide(CGRP)were detected by immuno-histochemistry and computer image analysis methods.The results showed that compared with the normal group,the expressions of CREB in the hippocampal CA1 region increased significantly in the HS,HS/IR and IR groups(P,0.05).Compared to the normal group,heat stress could result in CGRP excretion and redistribution in the cerebrum,with the highest level in the 4 d HS/IR group.Following heat stress,CGRP immunoreactivity was observed in varicose fibers and neuronal perikarya within the CA1 region.The results indicate that heat stress can induce CREB expression,which in turn stimulates CGRP secretion. 展开更多
关键词 heat stress pretreatment brain early signal substance reperfusion injury
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