In this study, the propagation behavior of {332}<113> twins was investigated in a Ti-12Mo (wt.%) alloy with micro-segregation bands (Mo content ranging from 10 to 13 wt.%). A unique transition from {332}<113> twins to "-martensite was observed when those twins propagated across the Mo-lean bands inside the grain. A deflection angle of ∼18° was found between the twin boundary and the "-martensite plate. This transition was more frequently found at relatively higher stresses. Thermodynamic analysis revealed that the Mo content together with the applied stress govern the required mechanical work for triggering " martensitic phase transformation. The stress-induced " martensitic phase transformation was easier to trigger in the Mo-lean bands, with a spontaneous interruption of the {332}<113> twin propagation. The present chemically segregated microstructure provides a novel approach to comprehensively characterize the variable deformation modes in metastable titanium alloys.

中文翻译：

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在具有微偏析的 Ti-12wt.% Mo 合金中，孪晶扩展过程中独特的 {332}<113> 孪晶到 α" 马氏体转变

在本研究中，研究了具有微偏析带（Mo 含量范围为 10 至 13 wt.%）的 Ti-12Mo (wt.%) 合金中的 {332}<113> 孪晶的扩展行为。当{332}<113>孪晶在晶粒内的贫钼带上传播时，观察到从{332}<113>孪晶到“-马氏体”的独特转变。在孪晶边界和“-马氏体板”之间发现~18°的偏转角。这种转变在相对较高的应力下更常见。热力学分析表明，Mo 含量与施加的应力一起控制触发“马氏体相变”所需的机械功。应力诱导的“马氏体相变在贫钼带中更容易触发，并且{ 332}<113>孪生传播。目前的化学偏析微观结构提供了一种全面表征亚稳态钛合金中可变变形模式的新方法。