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Phase stability dependence of deformation mode correlated mechanical properties and elastic properties in Ti-Nb gum metal

机译：Ti-Nb胶金属中变形模式的相稳定性与力学性能和弹性的关系

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Gum Metal; β phase stability; Metastable titanium alloy; Mechanical twining; Stress-induced martensitic transformation%The evolution of microstructure and deformation modes in metastable Ti-23Nb-0.7Ta-2Zr-0.8O (at%) alloys with accumulated strain to 0.15 are investigated, where different solution treatments were applied to control both elemental distributions and the bcc β-phase stability. Recent studies suggest that the occurrence of specific deformation mechanism of the β-phase is strongly linked with its chemical stability. In the present study, the Bo-Md phase stability diagram was used to evaluate the β-phase stability and to discuss the deformation modes as function of solution treatment conditions, resulting in different deformed microstructures. Analysis of the deformed microstructure using electron backscatter diffraction and X-ray diffraction revealed that deformation bands formed at the initial stage of strain were composed of not only mechanically induced {332} < 112 > β and {112} < 111 > β twinning, but also stress-induced martensite a" phase. It was observed that the number of deformation bands decreases with increasing homogeneity in the alloy, which is strongly dependent on the phase constitution, and directly impacts its final properties including hardness and elastic modulus. Based on the experimentally observed results, the β-phase stability dependence of deformation features can explain the possibility of manipulating the mechanical properties without the evident elastic properties variation in Ti-Nb Gum Metal.
机译：口香糖金属; β相稳定性；亚稳钛合金；机械缠绕研究了应力诱发的马氏体相变％研究了累积应变为0.15的亚稳Ti-23Nb-0.7Ta-2Zr-0.8O（at％）合金的显微组织和变形模式的演变，在其中采用了不同的固溶处理来控制两种元素的分布和bccβ相稳定性。最近的研究表明，β相特定变形机制的发生与其化学稳定性密切相关。在本研究中，使用Bo-Md相稳定性图评估β相稳定性，并讨论变形模式与固溶处理条件的关系，从而导致不同的变形微观结构。使用电子反向散射衍射和X射线衍射对变形的微观结构进行分析，结果表明，在应变初始阶段形成的变形带不仅由机械诱导的{332} <112>β和{112} <111>β孪晶组成，而且还包括还观察到，合金中形变带的数量随均匀性的增加而降低，这在很大程度上取决于相的组成，并直接影响其最终性能，包括硬度和弹性模量。实验观察到的结果，变形特征的β相稳定性依赖性可以解释在Ti-Nb口香糖金属没有明显弹性特性变化的情况下操纵机械特性的可能性。

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