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Mechanical behavior and microstructural evolution during cyclic tensile loading-unloading deformation in metastable Ti–10V–2Fe–3Al alloy
Materials Science and Engineering: A ( IF 6.1 ) Pub Date : 2022-01-14 , DOI: 10.1016/j.msea.2022.142663
Xueli Wang 1, 2, 3 , Fuguo Li 1, 2, 3 , Tianyu Xu 1, 2, 3 , Shitong Ma 1, 2 , Cheng Da 1, 2 , Minghe Wang 1, 2
Affiliation  

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 (σSIMT) 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.



中文翻译:

亚稳态 Ti-10V-2Fe-3Al 合金循环拉伸加载-卸载变形过程中的力学行为和显微组织演变

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。

更新日期:2022-01-18
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