Abstract

Texture evolution of NiTiFe shape memory alloy (SMA) is investigated during plane strain compression based on crystal plasticity finite element method (CPFEM) and electron back-scatter diffraction (EBSD) experiment. The deformation textures of NiTiFe SMA are not influenced very considerably after experiencing recrystalline annealing at 600 °C for 1 h. Based on the results of CPFEM, the main activated slip systems of NiTiFe SMA are 〈100〉/{110} and 〈111〉/{110} ones during plane strain compression. According to the relationship between texture components and activated slip systems put forward in this study, 〈110〉 direction would rotate to rolling direction, whereas 〈100〉 and 〈111〉 directions would rotate to normal direction. These rotations contribute to the formation of γ-fibre texture and α-fibre texture in NiTiFe SMA. The deformation texture components predicted by CPFEM and determined by EBSD were compared with each other in detail. Due to the startup of the pencil glide and multiple slip in the refined microstructure, there are some differences between texture components predicted by CPFEM and texture components determined by EBSD. The deformation heterogeneity is discussed in terms of rotation angle at each integration point in the study.

Graphic Abstract

中文翻译：

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NiTiFe形状记忆合金在平面应变压缩下织构演变机理的研究

摘要

基于晶体塑性有限元法（CPFEM）和电子背散射衍射（EBSD）实验，研究了平面应变压缩过程中NiTiFe形状记忆合金（SMA）的织构演变。NiTiFe SMA的变形织构在600°C进行1 h的重结晶退火后，不会受到很大的影响。根据CPFEM的结果，在平面应变压缩过程中，NiTiFe SMA的主要活化滑动系统是〈100〉 / {110}和〈111〉 / {110}。根据本研究提出的纹理成分与活化滑移系统之间的关系，〈110〉方向将旋转至滚动方向，而〈100〉和〈111〉方向将旋转至法线方向。这些旋转有助于形成γ纤维织构和αNiTiFe SMA中的高纤维质感。将由CPFEM预测并由EBSD确定的变形纹理分量进行了详细比较。由于铅笔滑行的启动和精细组织中的多次打滑，因此CPFEM预测的纹理成分与EBSD确定的纹理成分之间存在一些差异。研究中每个积分点的旋转角度讨论了变形异质性。

图形摘要