应力作用下NiTi形状记忆合金微结构演化的相场模拟及其本征应变率敏感性

席尚宾 苏煜

席尚宾, 苏煜. 应力作用下NiTi形状记忆合金微结构演化的相场模拟及其本征应变率敏感性[J]. 爆炸与冲击, 2022, 42(9): 091403. doi: 10.11883/bzycj-2021-0461
引用本文: 席尚宾, 苏煜. 应力作用下NiTi形状记忆合金微结构演化的相场模拟及其本征应变率敏感性[J]. 爆炸与冲击, 2022, 42(9): 091403. doi: 10.11883/bzycj-2021-0461
XI Shangbin, SU Yu. Phase-field simulation of microstructural dynamics in NiTi shape memory alloys and their intrinsic strain rate sensitivities[J]. Explosion And Shock Waves, 2022, 42(9): 091403. doi: 10.11883/bzycj-2021-0461
Citation: XI Shangbin, SU Yu. Phase-field simulation of microstructural dynamics in NiTi shape memory alloys and their intrinsic strain rate sensitivities[J]. Explosion And Shock Waves, 2022, 42(9): 091403. doi: 10.11883/bzycj-2021-0461

应力作用下NiTi形状记忆合金微结构演化的相场模拟及其本征应变率敏感性

doi: 10.11883/bzycj-2021-0461
基金项目: 国家自然科学基金(12172046,11672036)
详细信息
    作者简介:

    席尚宾(1986- ),男,博士,xishangbin@ifet-tsinghua.org

    通讯作者:

    苏 煜(1975- ),男,博士,教授,adamyusu@bit.edu.cn

  • 中图分类号: O347

Phase-field simulation of microstructural dynamics in NiTi shape memory alloys and their intrinsic strain rate sensitivities

  • 摘要: 基于Ginzburg-Landau动力学控制方程建立了NiTi形状记忆合金非等温相场模型,实现了对NiTi合金内应力诱导马氏体相变的数值模拟。同时将晶界能密度引入系统局部自由能密度,从而考虑多晶系统中晶界的重要作用。数值计算了单晶和多晶NiTi形状记忆合金在单轴机械载荷作用下微结构的动态演化过程和宏观力学行为,并重点研究了晶粒尺寸为60 nm的NiTi纳米多晶在低应变率下(0.0005~15 s−1)力学行为的本征应变率敏感性。研究结果表明,单晶NiTi合金系统高温拉伸-卸载过程中马氏体相变均匀发生,未形成奥氏体-马氏体界面。而纳米多晶系统在加载阶段出现了马氏体带的形成-扩展现象,在卸载阶段出现了马氏体带的收缩-消失现象。相同外载作用过程中,NiTi单晶系统的宏观应力-应变曲线具有更大的滞回环面积,拥有更优的超弹性变形能力。计算结果显示,在中低应变率下纳米晶NiTi形状记忆合金应力-应变关系表现出较明显的应变率相关性,应变率升高导致材料相变应力提升。这一应变率相关性主要源于相场模型中外加载荷速率与马氏体空间演化速度的相互竞争关系。
  • 图  1  NiTi 形状记忆合金局部自由能密度与序参量的关系

    Figure  1.  Relationship between local free energy density and order parameter of NiTi shape memory alloy

    图  2  数值计算边界条件及外加载荷历程

    Figure  2.  Boundary conditions and applied load history of the simulations

    图  3  单晶NiTi合金290 K环境温度下单轴拉伸-卸载过程的应力-应变曲线

    Figure  3.  Stress-strain curve of monocrystal NiTi shape memory alloy during tension-unloading at 290 K

    图  4  对应于图3中应力-应变曲线上关键点处的微结构,图中不同颜色代表不同的微结构形态

    Figure  4.  Microstructures corresponding to the representative points of the stress-strain curve in Fig. 3, and different colors represent different microstructural morphologies

    图  5  晶粒尺寸为60 nm的多晶NiTi形状记忆合金有限元模型

    Figure  5.  A finite element model of the polycrystalline NiTi shape memory alloy with the grain size of 60 nm

    图  6  晶粒尺寸为60 nm的NiTi多晶形状记忆合金290 K环境温度下单轴拉伸-卸载过程的应力-应变响应

    Figure  6.  Stress-strain response of the NiTi polycrystalline shape memory alloy with the grain size of 60 nm during tension-unloading at 290 K

    图  7  对应于图6中应力-应变曲线上关键点处的微结构云图

    Figure  7.  Microstructural morphologies corresponding to the representative points of the stress-strain curve in Fig.6

    图  8  NiTi单晶、多晶系统在20 s−1应变率下的应力-应变响应

    Figure  8.  Stress-strain curves of NiTi monocrystalline and polycrystalline at the strain rate of 20 s−1

    图  9  纳米晶NiTi多晶系统在不同应变率下的应力-应变曲线

    Figure  9.  Stress-strain curves of NiTi polycrystalline system at different strain rates

    图  10  对应于图9(a)中应力-应变曲线上关键点处的微结构形态

    Figure  10.  Microstructure morphologies corresponding to the representative points on the stress-strain curves in Fig. 9(a)

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出版历程
  • 收稿日期:  2021-11-09
  • 修回日期:  2022-07-11
  • 网络出版日期:  2022-07-23
  • 刊出日期:  2022-09-29

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