Abstract The microstructure/texture evolution (MTE, for short) map and processing map of a new near α titanium alloy Ti65 were constructed in order to investigate the workability and microstructure evolution of hot deformation. The processing map illustrated four domains, two summit domains and two instability domains. The morphologies of the α phase changed from the spheroidization (α+β region) to the deformed and elongated β grains (near the β transus temperature Tβ), and then to the obvious dynamic recrystallization (DRX) (β region) with the temperature rising from 930 °C to 1140 °C. Deformation in the α+β field mainly generated the texture component with [0001] or [ 02 2 ‾ 3 ] parallel to radial directions (RDs). While deformation in the β phase field formed two types of texture component with [0001] parallel to RDs and [ 2 1 ‾ 1 ‾ 0 ] parallel to compression direction. An optimized processing map was summarized by overlaying the macro-instability map on the original processing map, and the instability domain of Ti65 alloy was confirmed in the area with the strain rate higher than 0.01 s−1.

中文翻译：

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优化近α钛合金热变形过程的显微组织/织构演变图

摘要 为了研究热变形的可加工性和显微组织演化，构建了一种新型近α钛合金Ti65的显微组织/织构演化（简称MTE）图和加工图。加工图显示了四个域、两个峰顶域和两个不稳定域。随着温度的升高，α相的形貌由球化（α+β区）转变为变形拉长的β晶粒（β转变温度Tβ附近），再到明显的动态再结晶（DRX）（β区）从 930 °C 到 1140 °C。α+β 场的变形主要产生[0001] 或[02 2 ‾ 3 ] 平行于径向方向(RDs) 的纹理分量。而β相场中的变形形成了[0001]平行于RD和[2 1 ‾ 1 ‾ 0 ]平行于压缩方向的两种类型的织构分量。通过在原始加工图上叠加宏观不稳定性图总结出优化的加工图，并在应变率高于0.01 s-1的区域确认了Ti65合金的不稳定域。