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Chin. Phys. B, 2020, Vol. 29(5): 056202    DOI: 10.1088/1674-1056/ab8213
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

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

Yanfen Liu(刘艳芬)1, Xuexi Zhang(张学习)2, Hongxian Shen(沈红先)2, Jianfei Sun(孙剑飞)2, Qinan Li(李奇楠)1, Xiaohua Liu(刘晓华)1, Jianjun Li(李建军)1, Weidong Cheng(程伟东)1
1 Department of Physics, Qiqihar University, Qiqihar 161006, China;
2 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Abstract  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.
Keywords:  Ni-Mn-Ga-Fe microwire      chemical ordering annealing      martensite transformation      superelasticity  
Received:  06 February 2020      Accepted manuscript online: 
PACS:  62.20.fg (Shape-memory effect; yield stress; superelasticity)  
  71.20.Lp (Intermetallic compounds)  
  81.30.Kf (Martensitic transformations)  
Fund: 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), and Fundamental Research Funds in Heilongjiang Provincial Universities, China (Grant No. 135409320). Thanks to the help of Technology Innovation Center of Agricultural Multi-Dimensional Sensor Information Perception, Heilongjiang Province.
Corresponding Authors:  Yanfen Liu     E-mail:  lxylyf_0@163.com

Cite this article: 

Yanfen Liu(刘艳芬), Xuexi Zhang(张学习), Hongxian Shen(沈红先), Jianfei Sun(孙剑飞), Qinan Li(李奇楠), Xiaohua Liu(刘晓华), Jianjun Li(李建军), Weidong Cheng(程伟东) Effect of chemical ordering annealing on superelasticity of Ni-Mn-Ga-Fe ferromagnetic shape memory alloy microwires 2020 Chin. Phys. B 29 056202

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