梯度纳米晶NiTi形状记忆合金的超弹性和形状记忆效应相场模拟

徐波; 康国政

doi:10.6052/0459-1879-20-397

梯度纳米晶NiTi形状记忆合金的超弹性和形状记忆效应相场模拟

doi: 10.6052/0459-1879-20-397

徐波^*,
康国政^*,†,2), ,

^*西南交通大学力学与工程学院, 应用力学与结构安全四川省重点实验室, 成都 610031
^††西南交通大学牵引动力国家重点实验室, 成都 610031

基金项目: 1) 国家自然科学基金资助项目(11532010)

详细信息

作者简介:
2) 康国政, 教授, 主要研究方向: 材料的循环本构关系、疲劳与断裂. E-mail: guozhengkang@swjtu.edu.cn

通讯作者:
康国政

中图分类号: O341
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出版历程
- 收稿日期: 2020-11-23
- 刊出日期: 2021-03-10

PHASE FIELD SIMULATION ON THE SUPER-ELASTICITY AND SHAPE MEMORY EFFECT OF GRADIENT NANOCRYSTALLINE NiTi SHAPE MEMORY ALLOY

Xu Bo^*,
Kang Guozheng^{*,†,2)
, ,}

^*Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province$,$ School of Mechanics and Engineering$,$ Southwest Jiaotong University$,$ Chengdu $610031$$,$ China
^††State Key Laboratory of Traction Power$,$ Southwest Jiaotong University$,$ Chengdu $610031$$,$ China

摘要

摘要: 通过建立考虑两个马氏体变体的二维相场模型,对梯度纳米晶镍钛(NiTi)合金系统的超弹性、单程和应力辅助双程形状记忆过程进行了模拟和预测.模拟结果显示: 在梯度纳米晶NiTi合金的超弹性过程中,较粗晶粒的区域保留了传统粗晶的马氏体相变和逆相变特征,即局部马氏体带的形核-扩展和缩减-消失, 而随着晶粒尺寸的减小,细晶粒区域表现为均匀相变的特点, 即无局部马氏体带产生; 此外,在超弹性和形状记忆过程中,马氏体相变和重取向都首先在较粗晶粒区域开始并逐步向细晶粒区域传播,而逆相变则相反.马氏体相变和重取向的逐步扩展使梯度纳米晶NiTi合金的应力-应变和应变-温度曲线呈现出“硬化状”,其可归因于纳米多晶NiTi合金中马氏体相变对晶粒尺寸的依赖性,即随着晶粒尺寸的减小, 相变或重取向壁垒逐渐增大,马氏体相变或重取向的形核、扩展越来越困难. 可见,梯度纳米晶结构具有比传统均匀晶粒尺寸NiTi合金更宽的相变应力区间、重取向应力区间和相变温度区间,可显著提高该合金非弹性变形的可控性.
- 梯度纳米晶NiTi形状记忆合金 /
- 相场模拟 /
- 超弹性 /
- 形状记忆效应
Abstract: A two-dimensional phase field model was established to simulate and predict the super-elasticity, one-way and stress-assisted two-way shape memory effects of gradient nanocrystalline NiTi shape memory alloy system. The simulated results show that in the super-elastic process of gradient nanocrystalline NiTi alloy, the characteristics of martensite transformation and its reverse in the traditional coarse-grained NiTi alloy, i.e., nucleation-expansion and reduction-disappearance of local martensite band, are retained in the relatively coarse-grained region, but with the decrease of grain size, a homogeneous transformation mode, i.e., without the formation of local martensite band, is observed in the fine-grained region; moreover, in the super-elastic and shape memory processes, both the martensite transformation and reorientation originate from the relatively coarse-grained region and then propagate progressively to the fine-grained one, while the reverse transformation is opposite. The gradual propagations of martensite transformation and reorientation make the stress-strain and strain-temperature curves of gradient nanocrystalline NiTi alloy show a remarkable “hardening”, which can be attributed to the grain size-dependence of martensite transformation and re-orientation in nanocrystalline NiTi alloy, i.e., with decreasing the grain size, the transformation or re-orientation barrier increases gradually, and the nucleation and expansion of martensite transformation or re-orientation becomes more and more difficult. It is concluded that the gradient nanocrystalline structure has wider transformation stress, reorientation stress and transformation temperature windows than the traditional uniform-grained NiTi alloys, which means that the controllability of the inelastic deformation of such alloy is significantly improved.
- gradient nanocrystalline NiTi shape memory alloy /
- phase field simulation /
- super-elasticity /
- shape memory effect

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