Gamma-phase influence on shape memory properties in Ni-Mn-Co-Ga-Gd high-temperature shape memory alloys

被引：3
作者：
Zhang, Wei [1 ]
Zhang, Xin [1 ]
Wang, Qian [1 ]
Liu, Qing-Suo [1 ]
机构：
[1] Tianjin Univ Technol, Sch Mat Sci & Engn, Tianjin 300384, Peoples R China
来源：
ACTA METALLURGICA SINICA-ENGLISH LETTERS | 2018年 / 31卷 / 05期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Shape memory alloys; Ni-Mn-Ga alloys; Thermomechanical training; Second phase; Two-way shape memory effect; MARTENSITE DEFORMATION; STRAIN; MICROSTRUCTURE; STABILITY; NI2MNGA;
D O I：
10.1007/s40195-017-0675-3
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The effect of gamma-phase on two-way shape memory effect (TWSME) of polycrystalline Ni56Mn25-xCoxGa18.9Gd0.1 alloys was investigated. The results show that an appropriate amount of ductile gamma-phase significantly enhances the TWSME. The largest TWSME of 1.4% without training is observed in Ni56Mn21Co4Ga18.9Gd0.1 alloy, and this value is increased to 2.0% after thermomechanical training. The as-trained TWSME decays over the first five thermal cycles and then reaches a stable value as the number of cycles further increasing. Only the degradation of 0.2% is observed after 100 thermal cycles. The better TWSME and thermal stability are ascribed to the stable extra stress field formed by the plastically deformed gamma-phase.
引用
收藏
页码：471 / 476
页数：6
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