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Microstructure and texture in Ni_(50)Mn_(29)Ga_(21) deformed by high-pressure torsion

机译:高压扭转变形Ni_(50)Mn_(29)Ga_(21)的组织与织构

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摘要

The texture in a polycrystalline Ni_(50)Mn_(29)Ga_(21) magnetic shape-memory alloy deformed by high-pressure torsion (HPT) at 1173 K was investigated with high-energy synchrotron radiation. HPT changed the extrusion texture to a predominant slightly rotated cube {0 0 1} <1 0 0> and a weak F {1 1 0} <1 0 0> component. During HPT the grain structure coarsened. Phase transformations during cooling from the deformation temperature led to coarse and fine sets of martensitic twin variants. The results are discussed with respect to deformation mode, grain growth and phase transformations.
机译:利用高能同步加速器辐射研究了在1733 K下因高压扭变而变形的Ni_(50)Mn_(29)Ga_(21)磁性形状记忆合金多晶的织构。 HPT将挤出纹理更改为主要轻微旋转的立方体{0 0 1} <1 0 0>和弱F {1 1 0} <1 0 0>组件。在HPT期间,晶粒结构变粗了。冷却过程中从变形温度开始的相变导致了马氏体孪晶变体的粗集和精集。讨论了有关变形模式,晶粒长大和相变的结果。

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