材料科学
温度循环
无扩散变换
纳米晶材料
形状记忆合金
钛镍合金
多孔性
马氏体
复合材料
冶金
相(物质)
粒度
剪切矩阵
剪切(地质)
合金
热的
微观结构
热力学
纳米技术
化学
物理
非晶态金属
有机化学
作者
Bingfei Liu,Yuyang Wang,Wen Bing Wu
标识
DOI:10.1002/adem.202301019
摘要
Herein, the effects of thermal cycling and porosity on the martensitic phase transformation behavior of porous nanocrystalline (NC) NiTi shape memory alloys (SMAs) at the atomic scale are investigated by molecular dynamics simulation. The simulation results show that thermal cycling causes the NC NiTi SMAs to repeatedly undergo martensitic phase transformation and inverse phase transformation processes. The martensitic phase transformation capability is suppressed with increasing porosity and number of cycles, but the suppression effect of thermal cycling is weakened with increasing porosity. Moreover, the start temperature of martensitic transformation, residual martensitic phase, and the fraction of interstitial atoms increase with increasing porosity. Thermal cycling causes the disordered structures and shear plastic deformation to accumulate as cycling increases. Recoverable shear deformation is generated within the grain, but shear plastic deformation is mainly concentrated at both grain boundaries and pore surfaces. Residual martensitic phase increases after thermal cycling. These results provide important explanations and references for a deeper understanding of phase transformation behavior and pore effects caused by thermal cycling.
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