A phase-field model for interactive evolution of phase transformation and cracking in superelastic shape memory ceramics
A phase-field model for interactive evolution of phase transformation and cracking in superelastic shape memory ceramics
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DOI：
10.1016/j.commatsci.2022.111844
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发表时间：
2023-01
影响因子：
3.3
通讯作者：
Amirreza Lotfolahpour;W. Huber;M. Asle Zaeem
中科院分区：
文献类型：
--
作者：
Amirreza Lotfolahpour;W. Huber;M. Asle Zaeem
本文提出了一种修正的相场模型，用于精确耦合形状记忆陶瓷的相变和开裂。现有的相场模型低估了弹性响应的机械响应的开始。我们修改的化学自由能，以控制相变的速率，从而获得一个物理弹性响应开始之前的相变。首先，研究了3mol%氧化钇稳定的四元氧化锆超弹性单晶的正向和反向马氏体相变。在此基础上，研究了位移控制加载条件下相变与断裂的相互作用。该模型预测了一个现实的机械响应和实验观察到的微观结构和裂纹偏转由于相变。此外，该模型捕获的逆相变和应力降，由于裂纹扩展。
This work presents a modified phase-field model for accurate coupling of phase transformation and cracking in shape memory ceramics. The existing phase-field models underestimate the elastic response at the beginning of the mechanical response. We modified the chemical free energy to control the rate of phase transformation and consequently obtain a physical elastic response before initiation of phase transformation. First, the forward and reverse martensitic phase transformation in a superelastic single crystal 3 mol% yttria-stabilized tetragonal zirconia is studied. Then, the interaction between phase transformation and fracture under displacement-controlled loading condition is investigated. The model predicts a realistic mechanical response and the experimentally observed microstructure and crack deflection due to the phase transformation. In addition, the model captures the reverse phase transformation and the stress drop due to the crack propagation.