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Influence of Fe Addition on Phase Transformation,Microstructure and Mechanical Property of Equiatomic NiTi Shape Memory Alloy

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Acta Metallurgica Sinica(English Letters) 2017年第8期30卷 762-770页

作者： Ya-Nan Zhao shu-yong jiang Yan-Qiu Zhang Yu-Long Liang College of Mechanical and Electrical Engineering Harbin Engineering University Harbin 150001 China College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

Based on equiatomic nickel and titanium, three kinds of NiTiFe alloys with a nominal chemical composition of Ni49Ti49Fe2, Ni48Ti48Fe4 and Ni47Ti47Fe6 （at.%）, respectively, have been designed to investigate the influence of the addition of Fe element on phase transformation, microstructure and mechanical property of equiatomic NiTi shape memory alloy. The microstructures of three kinds of NiTiFe alloys are characterized by the equiaxed grains instead of the dendrites. Consequently, some Ti2Ni precipitates are found to distribute in the grains interior and at the grain boundaries. The content of Fe element has an important influence on mechanical property of NiTiFe alloy. With increasing content of Fe element, the strength of NiTiFe alloy increases substantially, but the plasticity decreases sharply. It can be concluded that pre- cipitation strengthening and solution strengthening play a significant role in enhancing the strength of NiTiFe alloy. In the case of three NiTiFe alloys, neither martensitic transformation nor reverse transformation can be observed in the range from -150 to 150 ~C. On the one hand, the phase transformation temperature is probably out of the scope of the present experimental temperature. On the other hand, the addition of Fe element probably suppresses first-order martensitic transformation or reverse transformation, and consequently the second-order-like phase transformation from an incom- mensurate stage to a commensurate stage can probably take place.

关键词： Shape memory alloy Mechanical property Microstructure Phase transformation

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Molecular dynamics simulation on mechanisms of plastic anisotropy in nanotwinned polycrystalline copper with{111}texture during tensile deformation

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Transactions of Nonferrous Metals Society of China 2021年第5期31卷 1381-1396页

作者： Yan-qiu ZHANG shu-yong jiang College of Mechanical and Electrical Engineering Harbin Engineering UniversityHarbin 150001China

Based on molecular dynamics(MD)simulation,the mechanisms of plastic anisotropy in nanotwinned polycrystalline copper with{111}texture during tensile deformation were systematically studied from the aspects of Schmid factor of the dominant slip system and the dislocation *** results show that the Schmid factor of dominated slip system is altered by changing the inclining angle of the twin boundaries(TBs),while the yield stress or flow stress does not strictly follow the Schmid *** exist hard and soft orientations involving different dislocation mechanisms during the tensile *** strengthening mechanism of hard orientation lies in the fact that there exist interactions between the dislocations and the TBs during plastic deformation,which leads to the dislocation blocking and *** softening mechanism of soft orientation lies in the fact that there is no interaction between the dislocations and the TBs because only the slip systems parallel to the TBs are activated and the dislocations slip on the planes parallel to the *** is concluded that the plastic anisotropy in the nanotwinned polycrystalline copper with{111}texture is aroused by the combination effect of the Schmid factor of dominated slip system and the dislocation mechanism.

关键词： mechanical property dislocations molecular dynamics plastic anisotropy nanotwins

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Prediction of grain scale plasticity of NiTi shape memory alloy based on crystal plasticity finite element method

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Transactions of Nonferrous Metals Society of China 2019年第4期29卷 775-784页

作者： Li HU shu-yong jiang Lai-xin SHI Yan-qiu ZHANG College of Material Science and Engineering Chongqing University of TechnologyChongqing 400054China College of Mechanical and Electrical Engineering Harbin Engineering UniversityHarbin 150001China

Grain scale plasticity of NiTi shape memory alloy(SMA)during uniaxial compression deformation at 400℃was investigated through two-dimensional crystal plasticity finite element simulation and corresponding analysis based on the obtained orientation *** and strain distributions of the deformed NiTi SMA samples confirm that there exhibits a heterogeneous plastic deformation at grain *** stored dislocation(SSD)density and geometrically necessary dislocation(GND)density were further used in order to illuminate the microstructure evolution during uniaxial *** is responsible for sustaining plastic deformation and it increases along with the increase of plastic *** plays an important role in accommodating compatible deformation between individual grains and thus it is correlated with the misorientation between neighboring grains,namely,a high GND density corresponds to large misorientation between grains and a low GND density corresponds to small misorientation between grains.

关键词： grain scale plasticity NiTi shape memory alloy crystal plasticity finite element method plastic deformation microstructure evolution

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Stress-induced martensite phase transformation of FeMnSiCrNi shape memory alloy subjected to mechanical vibrating polishing

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Transactions of Nonferrous Metals Society of China 2020年第6期30卷 1582-1593页

作者： shu-yong jiang Yu WANG Xiao-dong XING Yan-qiu ZHANG College of Mechanical and Electrical Engineering Harbin Engineering UniversityHarbin 150001China College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China

Fe66Mn15Si5Cr9Ni5(wt.%)shape memory alloy(SMA)withγaustenite andεmartensite was subjected to mechanical vibrating polishing and consequently its surface suffered from plastic deformation in the case of compressive *** completeεmartensite transformation is found to occur in FeMnSiCrNi sample subjected to mechanical vibrating polishing,where stress-induced martensite transformation plays a predominant *** martensite transformation of FeMnSiCrNi SMA is closely related to the orientation of external *** complicated compressive stress which results from the mechanical vibrating polishing contributes toεmartensite transformation fromγaustenite of FeMnSiCrNi *** vibrating polishing has a certain influence on the surface texture ofεmartensite of FeMnSiCrNi SMA,where■texture appears in the polished FeMnSiCrNi SMA.

关键词： shape memory alloy mechanical polishing martensitic transformation texture microstructure

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Mechanically-induced martensite transformation of NiTiFe shape memory alloy subjected to plane strain compression

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Transactions of Nonferrous Metals Society of China 2020年第5期30卷 1325-1334页

作者： shu-yong jiang Jun-bo YU Yan-qiu ZHANG Xiao-dong XING College of Mechanical and Electrical Engineering Harbin Engineering UniversityHarbin 150001China College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China

Based on the channel die compression, NiTiFe shape memory alloy(SMA) was subjected to plane strain compression. Mechanically-induced martensite transformation, nanocrystalline and amorphous phase can be observed in the case of large plastic strain. Mechanically-induced martensite transformation is obviously different from the conventional stress-induced martensite transformation. The former generally occurs after dislocation slip, whereas the latter arises prior to dislocation slip. The occurrence of B19’ martensite phase contributes to accommodating subsequent plastic deformation of NiTiFe SMA. Mechanically-induced B19’ martensite is partially stabilized due to the existence of local high stress field and consequently it is unable to be reverted to B2 austenite phase during unloading.

关键词： shape memory alloy NiTiFe alloy plastic deformation martensitic transformation microstructure

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Constitutive equation and processing map of equiatomic NiTi shape memory alloy under hot plastic deformation

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Transactions of Nonferrous Metals Society of China 2016年第8期26卷 2152-2161页

作者： Yan-qiu ZHANG shu-yong jiang Ya-nan ZHAO Si-wei LIU School of Mechanical and Electrical Engineering Harbin Engineering University Harbin 150001 China Hubei Water Resources Research Institute Wuhan 430070 China

In order to describe the deformation behavior and the hot workability of equiatomic NiTi shape memory alloy (SMA) during hot deformation, Arrhenius-type constitutive equation and hot processing map of the alloy were developed by hot compression tests at temperatures ranging from 500 to 1100 °C and strain rates ranging from 0.0005 to 0.5 s?1. The results show that the instability region of the hot processing map increases with the increase of deformation extent. The instability occurs in the low and high temperature regions. The instability region presents the adiabatic shear bands at low temperatures, but it exhibits the abnormal growth of the grains at high temperatures. Consequently, it is necessary to avoid processing the equiatomic NiTi SMA in these regions. It is preferable to process the NiTi SMA at the temperatures ranging from 750 to 900 °C.

关键词： NiTi alloy shape memory alloy hot plastic deformation constitutive equation hot processing map

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Influence of Fe addition on phase transformation behavior of Ni Ti shape memory alloy

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Transactions of Nonferrous Metals Society of China 2017年第7期27卷 1580-1587页

作者： Yan-qiu ZHANG shu-yong jiang Xiao-ming ZHU Ya-nan ZHAO Yu-long LIANG Dong SUN College of Mechanical and Electrical Engineering Harbin Engineering University Harbin 150001 China College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

Three different NiTi-based alloys,whose nominal compositions were Ni50Ti50,Ni49Ti49Fe2,Ni45Ti51.8Fe3.2(molefraction,%),respectively,were used in the current research to understand the influence of Fe addition on phase transformationbehavior in NiTi shape memory alloy(SMA).The microstructure and phase transformation behavior of the alloys were investigatedby optical microscopy(OM),transmission electron microscopy(TEM),X-ray diffraction(XRD)and differential scanningcalorimetry(DSC)*** results show that the matrix of the Ni50Ti50alloy consists of both B19′(martensite)phase and B2(austenite)***,the substructures of twins could be observed in the B19′***,the ternary alloys of NiTiFeexhibit B2phase in the *** microstructures were also characterized by large presence of Ti2Ni precipitatesdispersed homogenously in the matrix of the two kinds of *** addition of Fe to the NiTi SMA results in the decrease in phasetransformation temperatures in the ternary *** on mechanism analysis,it can be concluded that this phenomenon isprimarily attributed to atom relaxation of the distorted lattice induced by Ni-antisite defects and Fe substitutions during phasetransformation,which enables stabilization of B2phase during phase transformation.

关键词： shape memory alloy NiTi alloy NiTiFe alloy microstructure austenite martensite

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Dynamic recovery and dynamic recrystallization of NiTi shape memory alloy under hot compression deformation

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Transactions of Nonferrous Metals Society of China 2013年第1期23卷 140-147页

作者：江树勇张艳秋赵亚楠哈尔滨工程大学工程训练中心哈尔滨150001

Mechanical behavior of nickel？titanium shape memory alloy（NiTi SMA） under hot deformation was investigated according to the true stress—strain curves of NiTi samples under compression at the strain rates of 0.001-1 s-1 and at the temperatures of 600？1000℃.Dynamic recovery and dynamic recrystallization of NiTi SMA were systematically investigated by microstructural *** influence of the strain rates,the deformation temperatures and the deformation degree on the dynamic recovery and dynamic recrystallization of NiTi SMA was obtained as *** SMA was characterized by the combination of dynamic recovery and dynamic recrystallization at 600℃ and 700℃,but the complete dynamic recrystallization occurred at other deformation *** the deformation temperatures or decreasing the stain rates leads to larger equiaxed *** deformation degree has an important influence on the dynamic recrystallization of NiTi *** exists the critical deformation degree during the dynamic recrystallization of NiTi SMA,beyond which the larger deformation degree contributes to obtaining the finer equiaxed grains.

关键词： NiTi alloy shape memory alloy dynamic recovery dynamic recrystallization hot deformation

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罕见双峰织构在提高AZ31镁合金板材冷轧成形性能中的作用

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Transactions of Nonferrous Metals Society of China 2023年第8期33卷 2351-2364页

作者：韩修柱胡励贾东永陈家明周涛江树勇田政北京空间飞行器总体设计部北京100094 重庆理工大学材料科学与工程学院重庆400054 太原理工大学材料科学与工程学院太原030024

对基极由板材法向向轧向偏离±40°的罕见双峰织构AZ31镁合金板材进行多道次冷轧实验研究。该板材由等径角轧制−连续弯曲−退火工艺制备。实验结果表明,该罕见双峰织构能大幅度提高板材的冷轧累积减薄率至39.2%,是传统强基面织构板材冷... 详细信息

对基极由板材法向向轧向偏离±40°的罕见双峰织构AZ31镁合金板材进行多道次冷轧实验研究。该板材由等径角轧制−连续弯曲−退火工艺制备。实验结果表明,该罕见双峰织构能大幅度提高板材的冷轧累积减薄率至39.2%,是传统强基面织构板材冷轧累积减薄率的2倍以上(18.3%)。金相和电子背散射衍射分析表明,该罕见双峰织构板材在冷轧过程中的显微组织及织构演化与传统强基面织构板材的区别显著。施密特因子(SF)分析表明,在冷轧过程中,基面滑移和{1012}拉伸孪晶的SF值较大,而柱面滑移和锥面滑移的SF值较小。因此,基面滑移和{1012}拉伸孪晶在该罕见双峰织构AZ31镁合金板材冷轧过程中将被大量激活来承载塑性应变,进而显著提高板材的冷轧成形性能。

关键词： AZ31镁合金非基面织构冷轧工艺显微组织演化变形机制

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Effect of solution treatment and aging on microstructural evolution and mechanical behavior of NiTi shape memory alloy

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Transactions of Nonferrous Metals Society of China 2013年第12期23卷 3658-3667页

作者：江树勇赵亚楠张艳秋胡励梁玉龙哈尔滨工程大学工程训练中心哈尔滨150001 哈尔滨工程大学材料科学与化学工程学院哈尔滨150001

As-received nickel-titanium （NiTi） shape memory alloy with a nominal composition of Ni50.9Ti49.1 （mole fraction,%） was subjected to solution treatment at 1123 K for 2 h and subsequent aging for 2 h at 573 K, 723 K and 873 K, respectively. The influence of solution treatment and aging on microstructural evolution and mechanical behavior of NiTi alloy was systematically investigated by transmission electron microscopy （TEM）, high resolution transmission electron microscopy （HRTEM）, scanning electron microscopy （SEM） and compression test. Solution treatment contributes to eliminating the Ti2Ni phase in the as-received NiTi sample, in which the TiC phase is unable to be removed. Solution treatment leads to ordered domain of atomic arrangement in NiTi alloy. In all the aged NiTi samples, the Ni4Ti3 precipitates, the R phase and the B2 austenite coexist in the NiTi matrix at room temperature, while the martensitic twins can be observed in the NiTi samples aged at 873 K. In the NiTi samples aged at 573 and 723 K, the fine and dense Ni4Ti3 precipitates distribute uniformly in the NiTi matrix, and thus they are coherent with the B2 matrix. However, in the NiTi sample aged at 873 K, the Ni4Ti3 precipitates exhibit the very inhomogeneous size, and they are coherent, semi-coherent and incoherent with the B2 matrix. In the case of aging at 723 K, the NiTi sample exhibits the maximum yield strength, where the fine and homogeneous Ni4Ti3 precipitates act as the effective obstacles against the dislocation motion, which results in the maximum critical resolved shear stress for dislocation slip.

关键词： NiTi alloy shape memory alloy microstructural evolution mechanical properties solution treatment aging

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