The thermo-mechanical processing of Ti-alloys comprises several steps where complex deformation and temperature cycles are achieved. In this work, the static recrystallization behaviour of a Ti-17 alloy is investigated using ex-situ characterization and in-situ synchrotron radiation experiments aiming to understand the operating mechanisms and to establish the recrystallization kinetics. Hot compression in the β- field for different strain rates is applied to provide different initial microstructures before isothermal heat treatments and continuous cooling. Strain induced boundary migration is the main operating nucleation mechanism during static recrystallization. A simple mesoscale model is proposed to couple the evolution of the microstructure during hot deformation followed by annealing considering the heterogeneity of deformation within the β-grains, for the nucleation and growth of grains and the formation of the substructure by static recovery. Electron backscattered diffraction measurements are used after isothermal annealing and continuous cooling treatments to validate the model. A strong influence of the localization of deformation in the vicinity of the prior β-high angle grain boundaries is observed and empirically implemented in the mesoscale model. The strong influence of the temperature is attributed to the difference in high angle grain boundary mobility during static recrystallization. Grain refinement is not successfully achieved up to the investigated strain due to the insufficient nucleation rate with respect to the growth rate. However, a homogenous recrystallized microstructure is observed. The model can predict the microstructure for any starting microstructure, even beyond the experimental validation.

钛合金的热机械加工包括几个步骤，可实现复杂的变形和温度循环。在这项工作中，采用异位表征和原位同步加速辐射实验研究了Ti-17合金的静态再结晶行为，旨在了解其工作机理并建立再结晶动力学。在等温热处理和连续冷却之前，对不同应变率的β场进行热压缩，以提供不同的初始微观结构。应变诱导的边界迁移是静态再结晶过程中的主要工作成核机制。提出了一个简单的中尺度模型，该模型耦合了热变形过程中微观结构的演化，然后考虑了β晶粒内变形的异质性进行退火，以进行晶粒的形核和生长以及通过静态恢复形成亚结构。在等温退火和连续冷却处理之后，使用电子背散射衍射测量来验证模型。在中尺度模型中观察到并在经验上实现了对变形的局部化的强烈影响，该变形在先前的β-高角度晶界附近。温度的强烈影响归因于静态再结晶过程中高角度晶界迁移率的差异。由于成核速率相对于生长速率的不足，直到所研究的应变都不能成功地实现晶粒细化。但是，观察到均质的重结晶组织。该模型可以预测任何起始微观结构的微观结构，甚至可以超出实验验证范围。