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Effects of Temperature,Loading Frequency,Stress Amplitude,and Stress Ratio on the Low-Cycle Fatigue Behavior of FeMnSiCrNi Shape Memory Alloys 认领 引用 被引量：1
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作者 Bo Xu Beihai Huang +4 位作者 Sen Tang Xiang Xu Huabei Peng Chong Wang Qingyuan Wang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第2期133-151,共19页
FeMnSi-based shape memory alloys(SMAs)have great applied potential to large-scale structures in civil engineering,especially as an aseismic structural material.Low-cycle fatigue performance is one of the most importan... FeMnSi-based shape memory alloys(SMAs)have great applied potential to large-scale structures in civil engineering,especially as an aseismic structural material.Low-cycle fatigue performance is one of the most important properties of FeMnSi-based SMA aseismic materials.However,the low-cycle fatigue behavior of such SMAs,especially the stress-controlled low-cycle fatigue behavior(with ratchetting effect),has not been clearly understood.In this work,the low-cycle fatigue behavior of the FeMnSiCrNi SMAs subjected to stress-controlled cyclic tension–compression loads is investigated,and the effects of temperature,loading frequency,stress amplitude,and stress ratio are addressed.By analyzing the cyclic stress–strain response,fatigue fracture surface morphology,dissipation energy,ratchetting strain,and equivalent damping ratio,the mechanisms behind the temperature-,loading frequency-,stress amplitude-,and stress ratio-dependent low-cycle fatigue behavior are discussed.The results show that the plasticity,martensitic transformation,and/or the ratchetting strain caused by their tension–compression asymmetry are the decisive factors affecting the low-cycle fatigue behavior of FeMnSiCrNi SMAs. 展开更多
关键词 FeMnSiCrNi shape memory alloy Low-cycle fatigue behavior Temperature Loading frequency Stress amplitude Stress ratio
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4D printing of reprocessable thiocyanate covalent adaptable networks with reconfigurable shape memory ability 认领 引用 被引量：1
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作者 Ting Xu Kexiang Chen +7 位作者 Zhiyuan He Chuanzhen Zhang Xiaoyu Li Ziyan Zhang Wenbo Fan Zhishen Ge Chenhui Cui Yanfeng Zhang 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第2期505-511,共7页
Shape memory polymers used in 4D printing only had one permanent shape after molding,which limited their applications in requiring multiple reconstructions and multifunctional shapes.Furthermore,the inherent stability... Shape memory polymers used in 4D printing only had one permanent shape after molding,which limited their applications in requiring multiple reconstructions and multifunctional shapes.Furthermore,the inherent stability of the triazine ring structure within cyanate ester(CE)crosslinked networks after molding posed significant challenges for both recycling,repairing,and degradation of resin.To address these obstacles,dynamic thiocyanate ester(TCE)bonds and photocurable group were incorporated into CE,obtaining the recyclable and 3D printable CE covalent adaptable networks(CANs),denoted as PTCE1.5.This material exhibits a Young's modulus of 810 MPa and a tensile strength of 50.8 MPa.Notably,damaged printed PTCE1.5 objects can be readily repaired through reprinting and interface rejoining by thermal treatment.Leveraging the solid-state plasticity,PTCE1.5 also demonstrated attractive shape memory ability and permanent shape reconfigurability,enabling its reconfigurable 4D printing.The printed PTCE1.5 hinges and a main body were assembled into a deployable and retractable satellite model,validating its potential application as a controllable component in the aerospace field.Moreover,printed PTCE1.5 can be fully degraded into thiol-modified intermediate products.Overall,this material not only enriches the application range of CE resin,but also provides a reliable approach to addressing environmental issue. 展开更多
关键词 4D Printing Dynamic thiocyanate ester bonds Covalent adaptable networks Cyanate ester resin Shape memory
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Lignin-derived High-performance Near-infrared Light-responsive Shape Memory Polyurethanes for Biomedical Applications 认领 引用
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作者 Su-Yang Dai Jia-Yue Li +5 位作者 Ling-Chen Mao Dan-Hua Zhou Yu Zhang Zhi-Hua Gana Zhen-Bo Ning Yun-Feng Lu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第4期1090-1101,I0016,共12页
Near-infrared(NIR)light-responsive shape memory polymers(SMPs)show great promise for biomedical applications,but conventional photothermal agents suffer from high cost,complex preparation,or poor biocompatibility,whil... Near-infrared(NIR)light-responsive shape memory polymers(SMPs)show great promise for biomedical applications,but conventional photothermal agents suffer from high cost,complex preparation,or poor biocompatibility,while lignin-based alternatives exhibit insufficient photothermal conversion efficiency.Herein,we developed a novel strategy to enhance photothermal performance of lignin through sequential demethylation modification and Fe3+complexation for constructing NIR light responsive SMPs.Dealkaline lignin(DL)was first demethylated using iodocyclohexane to produce demethylated lignin(DDL)with increased catechol content,which was then incorporated into polycaprolactone-based polyurethane synthesis followed by Fe3+complexation.Results showed that DDL-Fe3+complexes have significantly enhanced photothermal conversion performance,and the resulting PU-DDL+Fe3+polyurethane with 0.5 wt%DDL content demonstrated a temperature increases of 39.8℃under 0.33 W·cm-2808 nm NIR irradiation.This excellent photothermal performance enables the shape-fixed PU-DDL+Fe3+polyurethane to rapidly recover to its initial shape under NIR light irradiation.Additionally,PU-DDL+Fe3+polyurethane exhibits good mechanical properties and biocompatibility,demonstrating significant biomedical application potential. 展开更多
关键词 Lignin Polyurethane Shape memory polymers NIR light responsive Polycaprolactone
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Comfort-tailored,zero-carbon thermoregulation fabric enabled by shape memory artificial muscles with noticeable amplitude 认领 引用
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作者 Weiyi Cai Jing Zou +3 位作者 Yongzhen Wang Jing Cheng Li Xu Jiaxin Li 《Science China Materials》 SCIE EI CAS CSCD 2026年第7期4211-4224,共14页
As individual demands for thermal–moisture comfort continue to increase alongside the high energy consumption issues associated with traditional heating and cooling systems and the urgent need for low-carbon energy c... As individual demands for thermal–moisture comfort continue to increase alongside the high energy consumption issues associated with traditional heating and cooling systems and the urgent need for low-carbon energy conservation,the development of shape memory smart fabrics capable of responding to environmental changes has become a research hotspot.However,existing shape memory thermal–moisture management fabrics currently face key issues such as excessively high response temperatures,inadequate response performance,and,consequently,the need for improved thermal–moisture management performance.In this work,a dual-network shape memory polymer(SMP)was prepared,and its shape memory temperature was adjusted to approach the thermal comfort range of the human body.The polymer fibers were made into shape memory fiber artificial muscles using twisted-coiled processing to increase reversible strain.Woven with wool into plain fabric,it has adaptive thermal–moisture management capabilities,with up to 17.5%warp reversible strain.At high temperatures,it contracts(air permeability of 1546 mm/s and thermal conductivity of 0.0518 W/(m K)),whereas at low temperatures,it elongates(air permeability of 1322 mm/s and thermal conductivity of 0.0426 W/(m K)),realizing“warm when cool and cool when hot”capabilities.Compared with commercial wool fabrics,this fabric can lower the skin microenvironment temperature by 1.5℃ and has an energy savings potential of approximately 222.58 MJ/m2 per year in capital cities,such as Beijing.This fabric offers a new technical pathway and design approach for future personalized comfort and low-carbon,energy-saving solutions. 展开更多
关键词 smart textile thermal–moisture management shape memory fiber artificial muscles
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Experimental Study of Mechanical Properties and Recovery Properties of Shape Memory Alloy Hybrid Composites under Static Bending 认领 引用
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作者 LI Xiao-bin ZHAO Zhe-ji +3 位作者 LI Meng-zhen ZHANG Yi-heng CHEN Wei LI Chun-bao 《船舶力学》 EI CSCD 北大核心 2026年第6期957-969,共13页
To enhance the bending mechanical properties of fiber-reinforced plastics(FRP)and address rapid damage repair under multiple bending loads,an improved shape memory alloy hybrid composite(ISMAHC)was developed by embedd... To enhance the bending mechanical properties of fiber-reinforced plastics(FRP)and address rapid damage repair under multiple bending loads,an improved shape memory alloy hybrid composite(ISMAHC)was developed by embedding layered orthogonal shape memory alloy(SMA)wires into FRP.Three-point bending and water bath recovery tests were performed on traditional single-layer unidirectional SMA hybrid composites(SMAHC),ISMAHC and FRP.The effects of layered orthogonal SMA configuration on stiffness,strength,and recovery capability were compared and investigated.Results demonstrate that SMA wires form a coupling effect with FRP,increasing the bending modulus.Furthermore,ISMAHC has higher stiffness due to its orthogonal architecture.The water bath recovery tests indicate that SMAHC and ISMAHC possess good deflection recoverability and mechanical property recoverability after multiple bending loadings.The deflection recovery rate of the first bending test is greater than 60%,and that of the second bending test is greater than 30%.Additionally,the bending modulus and bending strength recover more than 30%,with ISMAHC showing superior recoverability. 展开更多
关键词 shape memory alloy hybrid composites recovery properties mechanical properties static bending
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Synergistic size-temperature effects on the transition of compression instability modes in shape memory alloy nanorods 认领 引用
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作者 Chenyang Du Aimeng Zhang +4 位作者 Su Chen Ye Xiao Huan Li Chun Li Shaobin Zhang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第4期649-664,共16页
Size effect is typically expected to play an important role in the performance of low-dimensional materials.Meanwhile,due to thermo-mechanical coupling in shape memory alloys(SMAs),temperature also significantly influ... Size effect is typically expected to play an important role in the performance of low-dimensional materials.Meanwhile,due to thermo-mechanical coupling in shape memory alloys(SMAs),temperature also significantly influences phase transformation.This study investigates the synergistic size-temperature effects on the compression instability of NiTi SMA nanorods(NRs)through molecular dynamics simulations and theoretical modeling.The results indicate that the observed instability modes in NRs,namely phase transformation and buckling,are predominantly determined by their length-to-diameter ratio(α).The critical α for the transition between these two instability modes is dictated by a competitive mechanism involving phase transformation driving stress and buckling stress,both of which depend on the size and temperature of the system.A modified Timoshenko model is developed to theoretically predict the critical based on this stress competition mechanism,providing a comprehensive understanding of the synergistic size-temperature effects on the modulation of the critical.These findings could offer valuable insights for the mechanical design and application of microano devices utilizing SMA NRs. 展开更多
关键词 Size effect Temperature effect Compression instability Shape memory alloy Martensite transformation
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Jellyfish Robot Driven by Shape Memory Alloy Actuators 认领 引用
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作者 Montserrat Sanchez-Padilla Gabriel Jaimes-Hernandez +3 位作者 Marco Sandoval-Chileno Norma Lozada-Castillo Alberto Luviano-Juarez Ricardo Cortez 《Journal of Bionic Engineering》 SCIE EI CSCD 2026年第3期1398-1412,共15页
This study focuses on the design,development,and testing of a soft robot that emulates the contraction pattern of the Craspedacusta sowerbyi jellyfish,which has been analyzed using image processing techniques.This pro... This study focuses on the design,development,and testing of a soft robot that emulates the contraction pattern of the Craspedacusta sowerbyi jellyfish,which has been analyzed using image processing techniques.This prototype is mainly composed of a 20.4 cm diameter silicone body that possesses a set of backbone structures supporting a pair of braided Shape Memory Alloy wires that,once activated,produce a change in the shape of the body.Each pair of braided wires provides agonist-antagonist motion;the first has a 1.4 mm diameter and produces a bending of 2.3 cm in the backbone structure that generates the contraction of the jellyfish bell;when the second wires,which possess a 1 mm diameter,are activated,the bell of the jellyfish expands by changing the backbone structure to a straight shape.The implementation of the contraction pattern is achieved through the sequential activation of the braided wires using electric relays;this pattern takes 10 s to execute and provides a motion speed of 15.6 mm/s.The proposed architecture for the jellyfish robot allows for a smooth shape change that generates underwater motion without creating vibrations that affect the life forms in the environment and includes a camera to perform exploration tasks. 展开更多
关键词 Bio-mimetic robot Smart actuator Shape memory alloy Soft robot Jellyfish
4D printing of shape memory alloy metamaterials:Mechanisms,structures,and applications 认领 引用
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作者 Shiqing Wang Hao Cheng +2 位作者 Xiangru Li Bo Song Yusheng Shi 《Metals Advances》 SCIE EI CAS CSCD 2026年第2期8-25,共18页
Additive manufacturing(AM),also referred to as 3D printing,is an emerging fabrication technology that enables the construction of complex multiscale architectures with high material utilization through a layer-by-laye... Additive manufacturing(AM),also referred to as 3D printing,is an emerging fabrication technology that enables the construction of complex multiscale architectures with high material utilization through a layer-by-layer deposition strategy.Based on 3D printing,4D printing introduces a stimulus-responsive functionality in the time dimension,thereby achieving the integrated design of material,structure,and intelligent functional response.With reversible deformation,reusable functionality,and a high degree of topological freedom,4D printing exhibits promising advantages for lightweight and adaptive applications,and has consequently attracted extensive research interest.Following a technology-material-structure-application framework,the paper first reviews additive manufacturing methods for shape memory alloys(SMAs),together with their transformation behavior and principal alloy systems.The concept of metamaterials is then introduced,highlighting representative lattice structures and design strategies.Subsequently,emerging applications of SMA metamaterials are discussed.Finally,current challenges in 4D-printed SMA metamaterials are outlined,and perspectives on future development are proposed,intended to provide a reference for ongoing and forthcoming research. 展开更多
关键词 Additive manufacturing 4D printing Shape memory alloys Transformation behavior Metamaterials
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Laser-induced in situ reprogramming of magnetic shape memory composites for adaptive devices 认领 引用
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作者 Qianqian Zhang Rui Li +5 位作者 Yuan Tao Yiyu Chen Yanlei Hu Dong Wu Jiaru Chu Jiawen Li 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第1期767-779,共13页
Programmableeprogrammable magneto-responsive composites(MRCs)are highly desirable for applications in soft robotics,morphable actuators,and biomedical devices due to their capabilities of undergoing reversible,complex... Programmableeprogrammable magneto-responsive composites(MRCs)are highly desirable for applications in soft robotics,morphable actuators,and biomedical devices due to their capabilities of undergoing reversible,complex,untethered,and rapid deformations.However,current MRC-based devices primarily rely on soft matrices,which revert to their original shapes and cease functioning when external magnetic fields are removed.Moreover,their magnetization programming,deformations,and functioning need to alternate between encoding and actuation platforms,limiting the adaptability and efficiency.Here,we present a reprogrammable magnetic shape-memory composite(RM-SMC)integrating a shape-memory polymer(SMP)skeleton with phase-transition magnetic microcapsules.High-intensity laser melts microcapsules for magnetic realignment under programmed fields,while low-intensity laser softens SMP for structural reconfiguration without compromising integrity.This dual-laser strategy facilitates in situ magnetization programming,shape morphing,and function execution within a single material system.Our innovative approach enables unique applications,including omnidirectional multi-degree-of-freedom actuators that can activate light switches,solar trackers that optimize energy capture,and adaptive impellers that modulate fluid pumping.By eliminating platform alternation and enabling shape/function retention post-actuation,the RM-SMC platform overcomes critical limitations in conventional MRCs,establishing a paradigm for multifunctional devices requiring persistent configuration control and field-independent operation. 展开更多
关键词 magneto-responsive composites shape memory polymer in situ programming and deformation omnidirectional multi-degree of freedom actuator adjustable fluid pumping
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Enhanced Mechanical Properties and Prolonged Recovery Onset Period of Timed Shape Memory Hydrogels via Hydrophobic Interaction 认领 引用
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作者 Xiao-Ting Jia Yi-Ting Sun +1 位作者 Chu-Jun Ni Qian Zhao 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第7期2043-2050,共8页
Shape memory behavior with programmable recovery onset have been discovered very recently in poly(acrylic acid)hydrogels crosslinked by calcium ions.Their ability to undergo apparent autonomous and timed shape transfo... Shape memory behavior with programmable recovery onset have been discovered very recently in poly(acrylic acid)hydrogels crosslinked by calcium ions.Their ability to undergo apparent autonomous and timed shape transformation,governed by thermal-sensitive phase evolution,has attracted growing interests particularly for the development of trigger-free biomedical devices.While copolymerization with various monomers can introduce multifunctional properties,this strategy often compromises the phase-separated microstructure and shortens the recovery onset period.Here we introduce hydrophobic acrylate comonomers with different lengths of aliphatic chains to investigate various properties of the copolymerized hydrogels.Upon the same comonomer weight percentage of 20 wt%,short alkyl chains disrupt the polymer aggregation and disable the timed recovery.In contrast,longer alkyl chains form hydrophobic domains which enhance the mechanical properties of the hydrogel and prolong the onset time.Quantitatively,the copolymer hydrogel provided excellent tensile strength of 5.25 MPa and maximum onset period of strikingly 800 min,which are respectively 16.7 and 35 times than the homopolymer hydrogel.This work advances the understanding of the hydrogel system with programmable recovery onset and provides a promising molecular modulation strategy for functionalization of hydrogels with responsive phase separation behavior. 展开更多
关键词 Shape memory hydrogel Trigger-free transformation Hydrophobic acrylate Phase separation Mechanical properties
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Ultra-high temperature shape memory in high-Hf content NiTiHf alloys 认领 引用 被引量：2
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作者 A.V.Shuitcev Q.Z.Li +2 位作者 M.G.Khomutov L Li Y.X.Tong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第6期124-127,共4页
The active development of space industry necessitates the cre-ation of novel materials with unique properties,including shape memory alloys(SMAs).The development of ultra-high temperature SMAs(UHTSMAs)with operating t... The active development of space industry necessitates the cre-ation of novel materials with unique properties,including shape memory alloys(SMAs).The development of ultra-high temperature SMAs(UHTSMAs)with operating temperatures above 400℃is a significant challenge[1-3].It is known that reversible thermoelas-tic martensitic transformation(MT)is the basis for shape mem-ory behavior[4].Currently,there are several systems in which MT temperatures meet the above requirements,for example,RuNb[5],HfPd[6],TiPd[7]. 展开更多
关键词 shape memory alloys smas shape memory alloys ultra high temperature reversible thermoelastic martensitic transformation space industry nitihf alloys
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Intermittent healing for alleviating the functional fatigue and restoration of the elastocaloric effect in superelastic NiTi shape memory alloy 认领 引用 被引量：2
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作者 Junyu Chen Fei Liu +1 位作者 Gang Fang Upadrasta Ramamurty 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第24期289-303,共15页
Functional fatigue in the superelastic NiTi shape memory alloys occurs due to the accumulation of dislocations and retention of martensite with the cyclic loading.These mechanisms reduce the amount of the material ava... Functional fatigue in the superelastic NiTi shape memory alloys occurs due to the accumulation of dislocations and retention of martensite with the cyclic loading.These mechanisms reduce the amount of the material available for the stress-induced transformation and,thus,lower the elastocaloric effect that originates from the stress-induced latent heat variations.In this study,the individual contributions of the micromechanisms responsible for the functional fatigue in superelastic NiTi at different maximum tensile stress(σmax)are critically examined.Results show that the elastocaloric effect degrades significantly with cycling,and the saturated degraded value increases with σmax;the steady-state adiabatic temperature change is unexpectedly non-proportional to σmax.An overheating treatment(‘healing’)after mechanical fatigue reverts the retained martensite into austenite,making it available for subsequent transformation and restoring the elastocaloric effect significantly.Such a restoration increases exponentially with σmax.Consequently,the steady-state elastocaloric effect of the healed NiTi is proportional to σmax and can reach more than twice that of NiTi without healing.The work sheds light on the physical origins of elastocaloric degradation of superelastic NiTi and also provides a feasible method for ameliorating functional fatigue. 展开更多
关键词 Shape memory alloys Fatigue Transformation-induced plasticity Martensitic transformation Elastocaloric effect
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Smart reconfigurable metadevices made of shape memory alloy metamaterials 认领 引用 被引量：2
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作者 Shiqiang Zhao Yuancheng Fan +6 位作者 Ruisheng Yang Zhehao Ye Fuli Zhang Chen Wang Weijia Luo Yongzheng Wen Ji Zhou 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2025年第2期6-14,共9页
Reconfigurable metamaterials significantly expand the application scenarios and operating frequency range of metamaterials,making them promising candidates for use in smart tunable device.Here,we propose and experimen... Reconfigurable metamaterials significantly expand the application scenarios and operating frequency range of metamaterials,making them promising candidates for use in smart tunable device.Here,we propose and experimentally demonstrate that integrating metamaterial design principles with the intrinsic features of natural materials can engineer thermal smart metadevices.Tunable extraordinary optical transmission like(EOT-like)phenomena have been achieved in the microwave regime using shape memory alloy(SMA).The strongly localized fields generated by designed metadevices,combined with the intense interference of incident waves,enhance transmission through subwavelength apertures.Leveraging the temperature-responsive properties of SMA,the morphology of the metadevice can be recontructed,thereby modifying its response to electromagnetic waves.The experiments demonstrated control over the operating frequency and transmission amplitude of EOT-like behavior,achieving a maximum transmission enhancement factor of 126.Furthermore,the metadevices with modular design enable the realization of multiple functions with independent control have been demonstrated.The proposed SMA-based metamaterials offer advantages in terms of miniaturization,easy processing,and high design flexibility.They may have potential applications in microwave devices requiring temperature control,such as sensing and monitoring. 展开更多
关键词 metamaterials extraordinary optical transmission shape memory alloy temperature tunability
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In-situ synthesis of NiTi shape memory alloys with tunable chemical composition and thermomechanical response by dual-wire-feed electron beam directed energy deposition 认领 引用 被引量：1
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作者 Ze Pu Dong Du +3 位作者 Changyong Chen Zibin Chen Kangcheung Chan Baohua Chang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第13期209-225,共17页
In this study,we demonstrate the direct in-situ synthesis of NiTi alloys with tunable chemical com-position(Ni/Ti atomic ratio)and corresponding thermomechanical response.This synthesis is achieved by regulating the f... In this study,we demonstrate the direct in-situ synthesis of NiTi alloys with tunable chemical com-position(Ni/Ti atomic ratio)and corresponding thermomechanical response.This synthesis is achieved by regulating the feeding speed ratio of pure Ni and Ti wires during the additive manufacturing pro-cess based on dual-wire-feed electron beam directed energy deposition(EB-DED)technology.Under ap-propriate process conditions,the resulting NiTi alloys exhibit a controllable evolution around the near-equiatomic composition and display a typical columnar grain morphology characteristic of additively manufactured NiTi alloys.With an increase in Ni content(shifting from Ti-rich to Ni-rich),the second phase particles present in the samples change from Ti-rich phase(Ti2 Ni)to Ni-rich phases(such as Ni4 Ti3 and Ni3 Ti2).The phase transformation temperatures gradually decrease with increasing Ni content,and the predominant matrix phase transitions from martensite to austenite.The as-built NiTi alloy exhibits a typical tensile curve with a good tensile elongation of 11%,fabricated under suitable composition and microstructure conditions.This result surpasses values reported in current in-situ synthesized NiTi alloys through additive manufacturing methods.Moreover,it almost reaches the levels achieved by additively manufactured NiTi alloys using pre-alloyed raw materials.Furthermore,this study reports,for the first time in the field of in-situ synthesized NiTi alloys,a good tensile shape memory effect,achieving an im-pressive recovery rate of up to 70%under a tensile strain of 6%.This investigation provides a meaningful theoretical perspective and technical strategy for the integrated customization of NiTi alloy components in structure,composition,and function.This low-cost and high-efficiency approach is particularly attrac-tive for the preparation of functional graded,large-scale and disposable NiTi components. 展开更多
关键词 NiTi shape memory alloys In-situ synthesize Electron beam Directed energy deposition Tensile properties
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Effect of Annealing on the Shape Memory Effect and Mechanical Properties of Laser Powder Bed Fusion NiTi Alloy 认领 引用 被引量：1
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作者 Yunting Guo Mengqi Liu +8 位作者 Chaorui Jiang Ruiyao Liu Jundong Zhang Pengwei Sha Hang Li Zhenglei Yu Zhihui Zhang Zezhou Xu Luquan Ren 《Additive Manufacturing Frontiers》 CSCD 2025年第1期125-135,共11页
The emergence of additive manufacturing technology,particularly laser powder bed fusion,has revitalized NiTi alloy production.However,challenges arise regarding its mechanical properties and diminishing shape memory e... The emergence of additive manufacturing technology,particularly laser powder bed fusion,has revitalized NiTi alloy production.However,challenges arise regarding its mechanical properties and diminishing shape memory effect,which hinder its widespread application.Heat treatment has been identified as a method to enhance the performance of metallic materials in the realm of additive manufacturing.This process eliminates residual stress and enhances performance through precipitation strengthening.This study conducted a comprehensive annealing investigation on NiTi alloys to explore the impact of annealing time and temperature on the phase transformation behavior and shape memory performance.The mechanism underlying the performance enhancement was analyzed using scanning electron microscopy,energy-dispersive X-ray spectroscopy,electron backscatter diffraction,and transmission electron microscopy.The findings revealed that different annealing conditions resulted in multistep phase transformation behavior,with the 500℃-5 h sample exhibiting the best mechanical properties owing to the formation of nanoscale dispersed precipitates like Ni4Ti3.However,higher temperatures led to larger precipitates,significantly weakening the properties of the NiTi alloy.Additionally,the annealing treatment did not have a notable impact on the grain size,texture strength,or direction.This study provides valuable insights for optimizing the heat treatment process of LPBF-NiTi alloys. 展开更多
关键词 Annealing LPBF-NiTi Shape memory effect Mechanical properties Precipitates
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Phase Field Simulation of Fracture Behavior in Shape Memory Alloys and Shape Memory Ceramics:A Review 认领 引用
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作者 Junhui Hua Junyuan Xiong +2 位作者 Bo Xu Chong Wang Qingyuan Wang 《Computers, Materials & Continua》 SCIE EI 2025年第10期65-88,共24页
Shape memory alloys(SMAs)and shape memory ceramics(SMCs)exhibit high recovery ability due to the martensitic transformation,which complicates the fracture mechanism of SMAs and SMCs.The phase field method,as a powerfu... Shape memory alloys(SMAs)and shape memory ceramics(SMCs)exhibit high recovery ability due to the martensitic transformation,which complicates the fracture mechanism of SMAs and SMCs.The phase field method,as a powerful numerical simulation tool,can efficiently resolve the microstructural evolution,multi-field coupling effects,and fracture behavior of SMAs and SMCs.This review begins by presenting the fundamental theoretical framework of the fracture phase field method as applied to SMAs and SMCs,covering key aspects such as the phase field modeling of martensitic transformation and brittle fracture.Subsequently,it systematically examines the phase field simulations of fracture behaviors in SMAs and SMCs,with particular emphasis on how crystallographic orientation,grain size,and grain boundary properties influence the crack propagation.Additionally,the interplay between martensite transformation and fracture mechanisms is analyzed to provide deeper insights into the material responses under mechanical loading.Finally,the review explores future prospects and emerging trends in phase field simulations of SMA and SMC fracture behavior,along with potential advancements in the fracture phase field method itself,including multi-physics coupling and enhanced computational efficiency for large-scale simulations. 展开更多
关键词 Phase field fracture behavior shape memory alloy shape memory ceramic
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Design,Analysis and Prototype Testing of a Non-explosive Self-deploying Wing Actuated by NiTi Shape Memory Alloy Wires 认领 引用
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作者 Bin Huang Jun Wang +2 位作者 Xiaojun Gu Jihong Zhu Weihong Zhang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2025年第3期229-242,共14页
This paper introduces an innovative approach to the deployment of folding wings on cruise missiles,aiming to overcome the issues associated with explosive devices.The proposed solution involves employing NiTi shape me... This paper introduces an innovative approach to the deployment of folding wings on cruise missiles,aiming to overcome the issues associated with explosive devices.The proposed solution involves employing NiTi shape memory wires for a nonexplosive self-deploying wing mechanism.The fundamental concept of the design revolves around the utilization of NiTi wires,which contract upon electric heating.This contraction action severs the shear pin,consequently releasing the folded wings.The operational performance of the NiTi wire is thoroughly examined through a series of electro-thermo-mechanical tests,offering valuable insights for selecting the appropriate wire material.Moreover,the mechanical dynamics involved in the self-deploying process are elucidated through finite element simulations.The simulations highlight that the thermally-induced phase transformation within the NiTi wires generates substantial actuation forces,exceeding 700 N,and strokes of over 6 mm.These forces are deemed sufficient for breaking the aluminum shear pin and effecting wing deployment.The proposed mechanism’s practical viability is substantiated through prototype tests,which conclusively establish the superiority of the nonexplosive self-deploying wing mechanism when compared to conventional methods.The experimental outcomes underscore the mechanism’s capability to markedly reduce overload stress while remaining compliant with the designated requirements and constraints. 展开更多
关键词 Folding wing Shape memory alloy Cruise missile Explosion overload Actuation
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Effect of Co Content on Microstructure and Mechanical Properties of High-Entropy High-Temperature Shape Memory Alloy 认领 引用
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作者 Zhao Yanchun Jin Bo +4 位作者 Feng Yuanfei Ma Huwen Yu Zhiqi Feng Li Liaw Peter K 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第1期10-16,共7页
(TiZrHf)50Ni30Cu20-xCox(x=2,4,6,at%)high-entropy high-temperature shape memory alloys were fabricated by watercooled copper crucible in a magnetic levitation vacuum melting furnace,and the effects of Co co... (TiZrHf)50Ni30Cu20-xCox(x=2,4,6,at%)high-entropy high-temperature shape memory alloys were fabricated by watercooled copper crucible in a magnetic levitation vacuum melting furnace,and the effects of Co content on microstructure and mechanical properties were investigated.The results indicate that the grain size of the alloy decreases with increasing the Co content.In the as-cast state,the alloy consists primarily of the B19′phase,with a trace of B2 phase.The fracture morphology is predominantly composed of the B19′phase,whereas the B2 phase is nearly absent.Increasing the Co content or reducing the sample dimensions(d)markedly enhance the compressive strength and ductility of the alloy.When d=2 mm,the(TiZrHf)50Ni30Cu14Co6 alloy demonstrates the optimal mechanical properties,achieving a compressive strength of 2142.39±1.8 MPa and a plasticity of 17.31±0.3%.The compressive cyclic test shows that with increasing the compressive strain,the residual strain of the(TiZrHf)50Ni30Cu14Co6 alloy increases while the recovery ability declines.The superelastic recovery capability of the alloy is continuously enhanced.The superelastic recovery rate increases from 1.36%to 2.12%,the residual strain rate rises from 1.79%to 5.52%,the elastic recovery rate ascends from 3.86%to 7.36%,while the total recovery rate declines from 74.48%to 63.20%. 展开更多
关键词 high-temperature shape memory alloy high-entropy alloy microstructure mechanical property
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Modulation of transformation strain based on crystal orientation effects in NiTi shape memory alloy 认领 引用
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作者 Aimeng Zhang Su Chen +3 位作者 Chenyang Du Fa Wu Chun Li Shaobin Zhang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2025年第12期43-55,共13页
Equiatomic NiTi shape memory alloys(SMAs)can exhibit multiple martensitic transformations from a parent phase,significantly influencing the advanced macroscopic properties of SMAs,such as the large deformation/strain ... Equiatomic NiTi shape memory alloys(SMAs)can exhibit multiple martensitic transformations from a parent phase,significantly influencing the advanced macroscopic properties of SMAs,such as the large deformation/strain ability.A comprehensive atomic-scale understanding of the selection rule of the martensite phase/variant and its impact on the macroscopic mechanical behavior of SMA could be helpful for the development of high-performance SMAs.This work studies the transformation pathway,preferred martensite variant and corresponding macroscopic behavior of single crystal and bicrystal NiTi SMAs based on molecular dynamics and theoretical analysis.It is found that the transformation strain of single crystal NiTi is significantly influenced by the crystal orientation-dependent transformation pathway and martensite variant.The selection rule is that the transformation pathway and preferred martensite variant,leading to maximum transformation strains for each orientation,are energetically preferred.It can be predicted theoretically and agrees well with the molecular dynamic simulations.In addition,the stress-strain response of bicrystal NiTi can be modulated by changing its transformation pathway based on the orientation effect.This work provides atomic insights into the orientation-dependent deformation ability of NiTi and could be helpful for the development of high-performance SMAs through orientation modulation. 展开更多
关键词 Transformation strain Crystal orientation Shape memory alloy Martensite variant Transformation pathway
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Shape Memory Polymers with Self-folding Deformation and Multi-stimulus Response 认领 引用
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作者 Lan Zhang Wei Zhang +2 位作者 Qiushi Wang Suqian Ma Xia Yan 《Journal of Bionic Engineering》 SCIE EI CSCD 2025年第1期238-250,共13页
Shape Memory Polymers(SMPs)need to be given a temporary shape in advance to realize the shape memory process,but the manual shaping process is cumbersome and has low precision.Here,we propose a universal applicable me... Shape Memory Polymers(SMPs)need to be given a temporary shape in advance to realize the shape memory process,but the manual shaping process is cumbersome and has low precision.Here,we propose a universal applicable method for 4D printing self-folding SMPs by pre-stretching extruded filaments during 3D printing,the temporary shape of the SMPs were designed and fixed during 3D printing.Prepared samples can automatically perform shape memory process under stimulation without manual temporary shape programming process.Furthermore,using carbon ink as a photothermal conversion agent enables the 4D printing SMPs to have thermal and light response characteristics.In addition,some bionic applications of self-folding SMPs were demonstrated,such as self-morphing grasper,DNA double helix structures,programmable sequential switching mimosa,self-folding box and human hand.The combination of SMP and 3D printing fully takes advantage of 4D printing technology,and the self-folding SMPs show great potential applications in the fields of tissue engineering scaffold,self-folding robots,self-assembly system and so on. 展开更多
关键词 3D printing 4D printing Shape memory Multi-stimulus response Self-folding
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