Microstructure and transformation related behaviors of a Ni45.3Ti29.7Hf20Cu5 high temperature shape memory alloy
Microstructure and transformation related behaviors of a Ni45.3Ti29.7Hf20Cu5 high temperature shape memory alloy
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DOI：
10.1016/j.msea.2014.12.111
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发表时间：
2015-03
期刊：
影响因子：
6.4
通讯作者：
H. Karaca;E. Acar;G. S. Ded;S. Saghaian;B. Başaran;H. Tobe;M. Kök;H. Maier;R. Noebe;Y. C
中科院分区：
文献类型：
--
作者：
H. Karaca;E. Acar;G. S. Ded;S. Saghaian;B. Başaran;H. Tobe;M. Kök;H. Maier;R. Noebe;Y. C
研究了热处理温度和时间对Ni45.3Ti29.7Hf20Cu5（at %）高温多晶形状记忆合金的显微组织和形状记忆行为（相变温度、偏载形状记忆效应、超弹性、双向形状记忆效应及相关性能）的影响。热处理可用于控制TT，并在较小程度上控制可恢复和不可恢复的应变。Ni45.3Ti29.7Hf20Cu5合金能够在高于100 ° C的温度下在高压缩应力（700 MPa）下恢复高达2%的形状记忆应变，并且在非强应力循环训练过程之后，高达0.8%的TWSME应变是可能的。然而，由于克劳修斯-克拉珀龙斜率高、温度滞后大以及相变应力对温度的强烈依赖性，没有观察到完全可恢复的超弹性行为，因为塑性变形与应力诱导的马氏体相变同时发生。
Effects of heat treatment temperature and time on the microstructure and shape memory behaviors (e.g. transformation temperatures, load-biased shape memory effect, superelasticity, two-way shape memory effect, and related properties) were investigated in a Ni45.3Ti29.7Hf20Cu5(at%) high temperature polycrystalline shape memory alloy. Heat treatments could be used to control the TTs and to a lesser extent recoverable and irrecoverable strains. The Ni45.3Ti29.7Hf20Cu5alloy was capable of recovering shape memory strains of up to 2% at temperatures above 100 °C under high compressive stresses (700 MPa) and up to 0.8% TWSME strain was possible after a non-intense stress-cycling training process. However, due to high Clausius–Clapeyron slopes, large temperature hysteresis, and a strong dependence of transformation stress on temperature, fully recoverable superelastic behavior was not observed because plastic deformation occurred concurrently with the stress-induced martensitic transformation.