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Investigation of Dynamic Recrystallization of NiTi Shape Memory Alloy Subjected to Local Canning Compression

机译：NiTi形状记忆合金在局部罐头压缩作用下的动态再结晶研究

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Physical mechanism for dynamic recrystallization of NiTi shape memory alloy subjected to local canning compression at various temperatures, 600, 700 and 800 °C, was investigated via electron backscattered diffraction experiments and transmission electron microscopy observations. With increasing deformation temperature, fractions of recrystallized grains and substructures increase, whereas fraction of deformed grains decreases. In the case of 600 and 700 °C, continuous dynamic recrystallization and discontinuous dynamic recrystallization coexist in NiTi shape memory alloy. In the case of discontinuous dynamic recrystallization, the recrystallized grains are found to be nucleated at grain boundaries and even in grain interior. The pile-up of statistically stored dislocation lays the foundation for the nucleation of the recrystallized grains during discontinuous dynamic recrystallization of NiTi shape memory alloy. Geometrically necessary dislocation plays as an important role in the formation of new recrystallized grains during continuous dynamic recrystallization of NiTi shape memory alloy.
机译：通过电子背散射衍射实验和透射电子显微镜观察，研究了NiTi形状记忆合金在600、700和800°C的各种温度下受到局部罐头压缩的动态再结晶的物理机制。随着变形温度的升高，再结晶晶粒和亚结构的分数增加，而变形晶粒的分数下降。在600和700°C的情况下，NiTi形状记忆合金中同时存在连续动态再结晶和不连续动态再结晶的现象。在不连续动态再结晶的情况下，发现再结晶晶粒在晶界甚至晶粒内部成核。统计存储的位错的堆积为NiTi形状记忆合金不连续动态再结晶过程中再结晶晶粒的形核奠定了基础。在NiTi形状记忆合金连续动态再结晶过程中，几何上必要的位错在新的再结晶晶粒的形成中起着重要作用。

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