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首页> 外文期刊>Metals and Materials International >Subgrain Effect on Grain Scale Plasticity of NiTi Shape Memory Alloy Under Canning Compression: A Crystal Plasticity Finite Element Analysis
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Subgrain Effect on Grain Scale Plasticity of NiTi Shape Memory Alloy Under Canning Compression: A Crystal Plasticity Finite Element Analysis

机译：灌流压缩下镍尺度记忆合金籽粒尺度可塑性的粒度作用：晶体塑性有限元分析

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摘要

The subgrain effect of NiTi shape memory alloy during canning compression at 400 degrees C is investigated through electron back-scattered diffraction (EBSD) experiment, transmission electron microscope (TEM) experiment and crystal plasticity finite element (CPFE) simulation in explicit consideration of subgrain within each grain. Experimental investigations based on TEM and EBSD measurements confirm that the formation of subgrain actually results from the dislocation motion during canning compression. Numerical simulations based on the constructed polycrystalline models with various subgrains are used to investigate the subgrain effect during canning compression from a different point of view. In terms of texture evolution, subgrain effect does not change the tendency of texture evolution, but it contributes to the dispersed distribution with respect to the deformed grain/subgrain orientations. As for accumulative shear strain, subgrain effect contributes to sustaining larger plastic strain inside each grain, and it also results in the strain concentration near grain boundaries. With respect to von Mises stress, the subgrain effect facilitates the ease of stress concentration near grain boundaries and it contributes to possessing a homogeneous stress distribution within the inner part of each grain.
机译：通过电子背散射衍射（EBSD）实验，在明确考虑粒度的情况下，通过电子背散衍射（EBSD）实验研究了400摄氏度在400摄氏度下罐装压缩期间的罐装压缩过程中的粒度效应。每个谷物。基于TEM和EBSD测量的实验研究证实，灌溉压缩期间的位错运动实际上产生了子粒的形成。基于具有各种子晶体的构建多晶模型的数值模拟用于研究不同观点罐中的罐头压缩过程中的粒子效应。在纹理演化方面，粒子效应不会改变纹理演化的趋势，而是有助于分散的分布相对于变形的晶粒/子粒取向。至于累积剪切菌株，粒后效应有助于在每个谷物内部维持较大的塑性菌株，并且还导致晶界附近的应变浓度。关于Von Mises应力，粒子效应有助于易于晶界附近的应力浓度，有助于在每个谷物的内部内具有均匀的应力分布。

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