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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

徐波, 康国政. 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[J]. 力学学报, 2021, 53(3): 802-812. doi: 10.6052/0459-1879-20-397
引用本文: 徐波, 康国政. 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[J]. 力学学报, 2021, 53(3): 802-812. doi: 10.6052/0459-1879-20-397
Xu Bo, Kang Guozheng. PHASE FIELD SIMULATION ON THE SUPER-ELASTICITY AND SHAPE MEMORY EFFECT OF GRADIENT NANOCRYSTALLINE NiTi SHAPE MEMORY ALLOY[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(3): 802-812. doi: 10.6052/0459-1879-20-397
Citation: Xu Bo, Kang Guozheng. PHASE FIELD SIMULATION ON THE SUPER-ELASTICITY AND SHAPE MEMORY EFFECT OF GRADIENT NANOCRYSTALLINE NiTi SHAPE MEMORY ALLOY[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(3): 802-812. 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
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

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

  • 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.

     

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出版历程
  • 收稿日期:  2020-11-23
  • 刊出日期:  2021-03-10

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