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

被引：0
作者：
Wei Zhang
Xin Zhang
Qian Wang
Qing-Suo Liu
机构：
[1] Tianjin University of Technology,School of Materials Science and Engineering
来源：
Acta Metallurgica Sinica (English Letters) | 2018年 / 31卷
关键词：
Shape memory alloys; Ni–Mn–Ga alloys; Thermomechanical training; Second phase; Two-way shape memory effect;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The effect of γ-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 γ-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 γ-phase.
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页码：471 / 476
页数：5
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