A non-isothermal phase field study of the shape memory effect and pseudoelasticity of polycrystalline shape memory alloys
A non-isothermal phase field study of the shape memory effect and pseudoelasticity of polycrystalline shape memory alloys
复制标题
多晶形状记忆合金形状记忆效应和赝弹性的非等温相场研究
DOI：
10.1016/j.commatsci.2019.05.036
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发表时间：
2019-09
影响因子：
3.3
通讯作者：
Zhou Kun
中科院分区：
文献类型：
--
作者：
Sun Yuanzun;Luo Jun;Zhu Jingming;Zhou Kun
In this paper, a non-isothermal phase field (PF) model is proposed to investigate the shape memory effect (SME) and pseudoelasticity (PE) of polycrystalline shape memory alloys (SMAs) with consideration of the latent heat effect. The latent heat release and absorption accompanying the phase transformation processes are explicitly considered by coupling the phase field evolution with latent heat conduction. A modified Gibbs free energy function is proposed to accommodate the continuously varying temperature. It is shown that the SME and PE of polycrystalline SMAs under different ambient temperatures can be well characterized with the proposed PF model within a unified framework. The PF simulation results are in accordance with the previously reported experimental results. The influences of various factors such as the ambient temperature, grain size, crystal orientation, and latent heat effect on the phase transformation process and mechanical responses as well as the temperature evolution of SMAs are systematically discussed by conducting PF simulations. Some important implications for the devise of elastocaloric cooling devices are provided.
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