Structural changes of TiPt high-temperature shape memory alloys induced by high pressure torsion
Structural changes of TiPt high-temperature shape memory alloys induced by high pressure torsion
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高压扭转引起TiPt高温形状记忆合金的结构变化
DOI：
10.1016/j.jallcom.2022.168037
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发表时间：
2023
影响因子：
6.2
通讯作者：
M. Matsuda
中科院分区：
文献类型：
--
作者：
M. Kerber;T. Waitz;M. Matsuda
利用同步辐射实验和透射电子显微镜研究了TIPT高温形状记忆合金在高压扭转(HPT)下的显微组织。在严重塑性变形后，母组织B19马氏体得到强烈细化和高度应变。虽然没有遇到强烈的化学无序或非晶化，但观察到晶体反射的发生，这可以用L10相和长程有序堆积结构来指示。L10相的发生可能是由HPT过程中叠加的高静水应力和剪切应力所触发的。TIP的奥氏体相和马氏体相的开始和结束温度不受HPT的影响，因为加热时，再结晶发生在马氏体向奥氏体逆转变开始之前。
The microstructure of a TiPt high temperature shape memory alloy induced by high pressure torsion (HPT) was studied using synchrotron radiation experiments and transmission electron microscopy. Upon the severe plastic deformation, the parent B19 martensite is strongly refined and highly strained. While neither strong chemical disorder nor amorphization are encountered, the occurrence of crystal reflections is observed that can be indexed in terms of the L10phase and long range ordered stacking structures. The occurrence of the L10phase might be triggered by the high hydrostatic stress as well as shear stress superimposed during the HPT. The austenite and martensite start and finish temperatures of TiPt are not affected by the HPT since upon heating, recrystallization occurs prior to the onset of the reverse martensite to austenite transformation.