Abstract The globularization behavior of the basketweave microstructure in TC17 alloy is quantitatively analyzed during deformation and subsequent heat treatment. Collaborative behavior in the α lamellae and β phase evolution are proposed to affect globularization based on the transmission electron microscopy (TEM) and high-resolution electron backscatter diffraction (EBSD) observations as follows: (i) the interleaved α lamellae restrain the rotation of neighboring α lamellae and promote the formation of low-angle boundaries (LABs) and grooves, and then (ii) the β phase has a positive effect on facilitating the complete separation of α lamellae during deformation. During heat treatment, (iii) the formation of the LABs in the β grain interiors accelerates the appearance of necklace-like α grains, and (iv) the α lamellae promotes the break-up of β phase while the β phase has a positive effect on facilitating the complete separation of α lamellae. In other words, Collaborative behavior in α lamellae and β phase evolution promotes the globularization of TC17 alloy containing a basketweave microstructure. Except for the boundary splitting and termination migration, the mechanism of substructure rotation also participates in the globularization of TC17 alloy containing a basketweave microstructure, which is different to that of the alloys containing a colony microstructure.

中文翻译：

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α片晶和β相演化的协同行为及其对TC17合金球化的影响

摘要 定量分析了TC17 合金在变形和后续热处理过程中篮织组织的球化行为。基于透射电子显微镜 (TEM) 和高分辨率电子背散射衍射 (EBSD) 观察，提出了 α 薄片和 β 相演化的协同行为影响球化：(i) 交错的 α 薄片抑制相邻的旋转α 片层并促进低角度边界 (LAB) 和凹槽的形成，然后 (ii) β 相在变形过程中对促进 α 片层的完全分离具有积极作用。在热处理过程中，(iii) β 晶粒内部 LAB 的形成加速了项链状 α 晶粒的出现，(iv) α 片层促进了 β 相的破碎，而 β 相对促进 α 片层的完全分离有积极作用。换句话说，α 片晶和 β 相演化的协同行为促进了含有篮织组织的 TC17 合金的球化。除了边界分裂和终止迁移外，亚结构旋转的机制也参与了含有篮状组织的 TC17 合金的球化，这与含有菌落组织的合金不同。