Abstract In this paper, the Ti-55511 (Ti-5Al-5Mo-5 V-1Cr-1Fe) alloy was cross-rolled in β field with various rolling reductions, following by short-time aging at 600 °C. The evolution of microstructures and mechanical properties during cross rolling was investigated, and the effect of the deformation features on the precipitation behavior of α phase was elucidate. The results indicated that cross rolling can effectively promote the grain refinement of the β phase, which results in increased tensile strength and weakened texture. Kink bands, stress/strain-induced martensite phases and β-twins were activated in the cross-rolled β matrix, which have a positive influence on the increase of ductility. Besides, the β twin was observed near the β grain boundaries where a high density of dislocations was developed, and the formation of β twins was dependent on the local element content. As a result of soaking in the α + β field, the α phase prefers to precipitate from the pre-existing dislocation structures and martensite phase.

中文翻译：

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近β-Ti合金变形特征和析出行为的多尺度表征

摘要 本文将Ti-55511（Ti-5Al-5Mo-5 V-1Cr-1Fe）合金在β场进行不同压下率的斜轧，然后在600 °C下进行短时时效。研究了交叉轧制过程中组织和力学性能的演变，阐明了变形特征对α相析出行为的影响。结果表明，交叉轧制可以有效地促进β相晶粒细化，从而导致抗拉强度增加和织构减弱。交叉轧制的 β 基体中的扭结带、应力/应变诱导马氏体相和 β-孪晶被激活，这对延展性的增加具有积极影响。此外，在发育高密度位错的β晶界附近观察到β孪晶，β孪晶的形成取决于局部元素含量。由于在 α + β 场中浸泡，α 相更倾向于从预先存在的位错结构和马氏体相中析出。