在钛合金热加工中，通过两相区热变形将片层组织破碎为细晶等轴组织，是调控组织，获得优异综合力学性能的关键工步。本文系统综述了近年国内外学者针对片层组织钛合金热变形组织演化与流动行为的研究成果，旨在为钛合金热加工工艺优化与组织调控提供指导。

文章介绍了初始片层组织的特征，并据此讨论了其热变形中的组织演化，从球化机制、球化不均匀性和球化动力学三个方面详细分析了片层组织的球化行为；总结了片层组织热变形流动行为的典型特征，讨论了显著流动软化的内在机制；介绍了片层组织热变形组织演化与流动行为建模的最新研究进展；最后，指出了片层组织钛合金热变形组织演化与流动行为研究中仍然存在的问题与挑战。

Fig. 1. The typical lamellar microstructure after primary hot working in β-phase region (The microstructure of TA15 alloy after heating to 1020 °C, hold 5 min then air cooled).

Fig. 2. Schematic of formation process (a) [14] and Burgers relationship between α and β phase (b) [16] of lamellar microstructure.

Fig. 3. Typical orientation map (a) and orientation relationship between α and β phase (b) of lamellar microstructure [17].

Fig. 4. Important parameters of β processing, influencing mechanisms and resulting microstructure features of lamellar microstructure.

Fig. 5. General influence law of cooling rate on the microstructure features of lamellar microstructure.

Fig. 6. The typical evolution of lamellar α during hot deformation of Ti-6Al-4 V alloy with lamellar microstructure at 600 °C and 0.001 s^-1: (a) prior to deformation, and after height reductions of (b) 25%, (c) 50% and (d) 70% [11].

Fig. 7. Orientation distribution of lamellar α traces relative to the compression axis for Ti-6Al-4 V with lamellar microstructure deformed at 900 °C, 0.1 s⁻¹ to different strains [12].

Fig. 8. The typical crystallographic texture evolution of lamellar α during hot deformation of Ti-6Al-4 V alloy with lamellar microstructure at 950 °C and 0.1 s⁻¹: (a) ε = 0, (b) ε = 0.2, (c) ε = 0.7, (d) ε = 1.0 [42].

Fig. 9. The kinking of lamellar colonies during hot compression (a) and tension (b) of Ti-6Al-4 V at 900 °C, 0.1 s^-1. The compression/tension axis is vertical in both micrographs. [46].

Fig. 10. The SEM image (a) and corresponding inverse pole figure (b) of a region containing kinking of lamellar α in the hot deformation of TA15 alloy with lamellar microstructure [17]. (In the inverse pole figure, β phase is indicated by gray areas, the black lines correspond to HABs, and the silver lines represent LABs).

高鹏飞，西北工业大学副教授，博导，中国科协青年人才托举工程、人社部“香江学者”计划入选者，获机械工程学会上银优博与陕西省优博奖。主要从事航空航天领域难变形材料复杂构件的高性能精确塑性成形理论与技术研究，先后主持国家自然科学基金面上项目及青年项目、装备预研航天科技联合基金等国家与省部级项目6项；在本领域知名国际期刊发表SCI论文40余篇。