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A macroscopic constitutive model of temperature-induced phase transition of polycrystalline Ni_2MnGa by directional solidification

机译：定向凝固温度诱导多晶Ni_2MnGa相变宏观本构模型

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摘要

Directional solidification technology has been widely used to improve the properties of polycrystalline Ni_2MnGa materials. Mechanical training can adjust the internal organizational structures of the materials, reduce the stress of twin boundaries motion, and then result in larger strain at lower outfield levels. In this paper, we test the microscopic structure of Ni_2MnGa polycrystalline ferromagnetic shape memory alloy produced by directional solidification and compress it along two axes successively for mechanical training. The influences of pre-compressive stresses on the temperature-induced strains are analyzed. The macroscopic mechanical behaviors show anisotropy. According to the generating mechanism of the macroscopic strain, a three-dimensional constitutive model is established. Based on thermodynamic method, the kinetic equations of the martensitic transformation and inverse transformation are presented considering the driving force and energy dissipation. The prediction curves of temperature-induce strains along two different directions are investigated. And the results coincide well with the experiment data. It well explains the macroscopic anisotropy mechanical behaviors and fits for using in engineering.
机译：定向凝固技术已被广泛用于改善多晶Ni_2MnGa材料的性能。机械训练可以调整材料的内部组织结构，减轻双边界运动的压力，然后在较低的外场水平上产生较大的应变。在本文中，我们测试了定向凝固制备的Ni_2MnGa多晶铁磁形状记忆合金的微观结构，并沿两个轴依次压缩以进行机械训练。分析了预压缩应力对温度引起的应变的影响。宏观力学行为表现出各向异性。根据宏观应变的产生机理，建立了三维本构模型。基于热力学方法，提出了考虑驱动力和能量耗散的马氏体相变和逆相变动力学方程。研究了沿两个不同方向的温度诱导应变的预测曲线。结果与实验数据吻合良好。它很好地解释了宏观各向异性力学行为，并适合在工程中使用。

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