The mechanical behavior and microstructural evolution for Ti–10V–2Fe–3Al (Ti-1023) alloy with a single metastable β-grains obtained by β solution treatment (β-ST) were discussed by X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) during the various early stages of cyclic tensile loading-unloading deformation (abbreviated as cyclic deformation) at ambient temperature. The main deformation product is stress-induced martensite transformation (SIMT) by coupling mechanical characterization and microstructure observation. With the cycles increasing, the trigger stress of SIMT (σ_SIMT) decreases with a stress plateau (120 MPa ±10), and the volume fraction of SIMT gradually increases until a nearly complete α″ martensite microstructure. Besides, the deformation-induced martensite twins (DIMT) in the α″ martensite have been generated until reaching a certain strain value. Moreover, there is specific orientation relationships (SORs) between β matrix and α″ martensite with <100>_β//<100>_α″, <110>_β//<010>_α″, and <110>_β//<001>_α″. And the geometrically necessary dislocations (GNDs) structure evolution is sensitive to cyclic strain and grain orientation. Moreover, GNDs synergizes the microstructure evolution and mechanical behavior.

通过 X 射线衍射 (XRD) 和电子背散射讨论了通过 β 固溶处理 (β-ST) 获得的具有单个亚稳态 β 晶粒的 Ti-10V-2Fe-3Al (Ti-1023) 合金的力学行为和显微组织演变在环境温度下循环拉伸加载-卸载变形（缩写为循环变形）的各个早期阶段的衍射（EBSD）。主要变形产物是应力诱发马氏体转变（SIMT），通过耦合力学表征和显微组织观察。随着循环次数的增加，SIMT 的触发应力 (σ _SIMT) 随着应力平台 (120 MPa ±10) 减小，SIMT 的体积分数逐渐增加，直到接近完整的 α″ 马氏体组织。此外，α”马氏体中的形变诱导马氏体孪晶（DIMT）已经生成，直到达到一定的应变值。此外，β基体和α”马氏体之间存在特定的取向关系（SOR），分别为<100> _β //<100> _α”、<110> _β //<010> _α”和<110> _β //< 001> _α”。几何必要位错（GNDs）结构演化对循环应变和晶粒取向敏感。此外，GNDs 协同微观结构演变和机械行为。