Three-Dimensional Phase-Field Simulation of Stress-Assisted Two-Way Shape Memory Effect and Its Cyclic Degradation of Single-Crystal NiTi Shape Memory Alloy

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外文标题：Three-Dimensional Phase-Field Simulation of Stress-Assisted Two-Way Shape Memory Effect and Its Cyclic Degradation of Single-Crystal NiTi Shape Memory Alloy

外文摘要：In this work,a three-dimensional crystal-plasticity-based phase-field model considering three kinds of inelastic deformation mechanisms,i.e.,martensitic transformation,dislocation slip in austenite,and dislocation slip in martensite,is established to simulate the stress-assisted two-way shape memory effect(SATWSME)of NiTi single crystals and its cyclic degradation.The simulation results show that the ability of the SATWSME of NiTi single crystal increases as increasing the constant stress in the range discussed in this work(10-100 MPa),which is due to the increase of reoriented martensite formed in the cooling process due to the enhanced variant-selection capability of increased constant stress.The martensitic transformation and its reverse in the cyclic process reflecting the SATWSME show more and more obvious localization characteristics,resulting in the accumulation of significantly heterogeneous plastic deformation(mainly caused by the dislocation slip in austenite),which leads to the cyclic degradation of SATWSME.The simulation results and the conclusions drawn from this work are helpful for further understanding the mechanism of functional cyclic degradation of NiTi alloys.

外文关键词：

Phase-fieldNiTi shape memory alloyCrystal plasticityStress-assisted two-way shape memory effectCyclic degradation

作者：

Bo Xu、Chao Yu、Chong Wang、Qingyuan Wang、Guozheng Kang

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作者单位：

Failure Mechanics and Engineering Disaster Prevention,Key Laboratory of Sichuan Province,Sichuan University,Chengdu 610065,China

Key Laboratory of Deep Underground Science and Engineering,Ministry of Education,Sichuan University,Chengdu 610065,China

Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province,School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 610031,China

Institute of Applied Mechanics,State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China

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关键词：

Phase-field NiTi shape memory alloy Crystal plasticity Stress-assisted two-way shape memory effect Cyclic degradation

出版年：

2024

DOI：

10.1007/s10338-024-00504-5

固体力学学报(英文版)

中国力学学会

固体力学学报(英文版)

影响因子：0.214

ISSN：0894-9166

年,卷(期)：2024.37(6)