Effect of chemical ordering annealing on superelasticity of Ni-Mn-Ga-Fe ferromagnetic shape memory alloy microwires  

作　　者：Yanfen Liu Xuexi Zhang Hongxian Shen Jianfei Sun Qinan Li Xiaohua Liu Jianjun Li Weidong Cheng 刘艳芬;张学习;沈红先;孙剑飞;李奇楠;刘晓华;李建军;程伟东(Department of Physics,Qiqihar University,Qiqihar 161006,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]Department of Physics,Qiqihar University,Qiqihar 161006,China [2]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Chinese Physics B》2020年第5期414-419,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 51701099,51801044,and 51671071);the Natural Science Foundation of Heilongjiang Province of China (Grant No. LH2019E091);Fundamental Research Funds in Heilongjiang Provincial Universities,China (Grant No. 135409320);the help of Technology Innovation Center of Agricultural Multi-Dimensional Sensor Information Perception,Heilongjiang Province.

摘　　要：Ni50Mn25Ga20Fe5 ferromagnetic shape memory alloy microwires with diameters of^30-50μm and grain sizes of^2-5μm were prepared by melt-extraction technique.A step-wise chemical ordering annealing was carried out to improve the superelasticity strain and recovery ratio which were hampered by the internal stress,compositional inhomogeneity,and high-density defects in the as-extracted Ni50Mn25Ga20Fe5 microwires.The annealed microwires exhibited enhanced atomic ordering degree,narrow thermal hysteresis,and high saturation magnetization under a low magnetic field.As a result,the annealed microwire showed decreased superelastic critical stress,improved reversibility,and a high superelastic strain(1.9%)with a large recovery ratio(>96%).This kind of filamentous material with superior superelastic effects may be promising materials for minor-devices.

关 键 词：Ni-Mn-Ga-Fe microwire chemical ordering annealing martensite transformation SUPERELASTICITY 

分 类 号：TG139.6[一般工业技术—材料科学与工程] TG156.2[金属学及工艺—合金]