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

页码：471 / 476

页数：6

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