New dislocation dissociation accompanied by anti-phase shuffling in the α″ martensite phase of a Ti alloy
New dislocation dissociation accompanied by anti-phase shuffling in the α″ martensite phase of a Ti alloy
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Ti合金α”马氏体相中新位错解离伴随反相改组
DOI：
10.1016/j.actamat.2022.117705
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发表时间：
2022
期刊：
影响因子：
9.4
通讯作者：
Hosoda Hideki
中科院分区：
文献类型：
--
作者：
Tahara Masaki;Otaki Nao;Minami Daichi;Uesugi Tokuteru;Takigawa Yorinobu;Higashi Kenji;Inamura Tomonari;Hosoda Hideki
马氏体相在形状记忆效应和超弹性中起着至关重要的作用。通过系统的透射电镜分析和第一性原理计算，在一种钛基形状记忆合金的α ″马氏体相中发现了一种新的位错解离现象。最近< 101>在应力诱发马氏体相变制备的单晶马氏体中发现位错的滑移方向为沿着。位错< 101>解离成两个部分位错，并且两个部分位错的Burgers矢量等于1/2< 101>。在分离的部分位错之间观察到基面反相重排的平面断层。位错的解离反应< 101>可概括为< 101>→ 1/2< 101>+反相重排边界+1/2< 101>。观察到的位错多为螺型位错，游离的部分位错绕位错线扭曲。
Martensite phase plays a crucial role in the shape memory effect and superelasticity. In this study, a new dislocation dissociation was found in the α ″martensite phase of a Ti-based biomedical shape memory alloy by systematic transmission electron microscopy analysis and first-principles calculations. The slip direction of dislocation was along< 101>, which was recently found in a single-crystalline martensite fabricated using stress-induced martensitic transformation. The< 101> dislocation dissociated into two partial dislocations, and the Burgers vector for both partial dislocations was equal to 1/2< 101>. A planar fault with an anti-phase shuffling of basal plane was observed between the dissociated partial dislocations. The dissociation reaction of the< 101> dislocation was summarized as< 101>→ 1/2< 101>+ anti-phase shuffling boundary+ 1/2< 101>. Most of the observed dislocations were in the form of screw dislocations, and the dissociated partial dislocations were twisted around the dislocation line.