体积深过冷熔体非平衡凝固组织中的再结晶研究

再结晶转变在工业生产中的应用十分广泛，其主要被用于调控金属材料微观组织的晶粒度和织构等, 从而获取所需性能。目前，传统的再结晶理论和技术大多是基于固态金属或者合金在塑性变形后退火过程中的再结晶，探索和设计新的再结晶加工工艺方法的需求十分迫切。以往非平衡凝固和再结晶的理论和实验研究相互独立，未考虑极端非平衡凝固过程中非平衡效应的物理作用，致使关于非平衡凝固与固态再结晶这两个密切关联的物理过程的研究长期进展缓慢。本项目立足于深过冷快速凝固等技术，研究快速凝固过程中非平衡效应对固态再结晶的影响，以及非平衡凝固组织中再结晶晶粒界面形貌、迁移速率和再结晶动力学能垒随过冷度的演化规律, 并建立相关物理模型。在大过冷度熔体快速凝固前，采用快淬技术对过冷熔体快淬，结合冷变形，揭示极端非平衡凝固组织中晶体缺陷特征及其回复和再结晶机制，从而拓展关于非平衡凝固与固态再结晶间内在联系的理论与技术。

Recrystallization transformation is widely used in industrial production, and it can be used to control the grain size and texture of the microstructure of the alloy to obtain the required performance. At present, most theories and techniques of recrystallization are based on the recrystallization of the annealed solid metal or alloy after the processing of plastic deformation. It is very urgent to explore and design new recrystallization processing technologies. In the past, the theoretical and experimental research on non-equilibrium solidification and recrystallization are independent of each other, the non-equilibrium effects in the processing of extreme non-equilibrium solidification are not considered. The study of these two closely related physical processes has been lacked. This project is based on the undercooling rapid solidification technology and the study of the two simple single phase solution alloy, , the effect of non-equilibrium effect on solid state recrystallization during solidification are to be studied, the two simple single phase solution alloy, the interface morphology and migration rate of recrystallized grains and the evolution rule of the recrystallization kinetic energy barrier with undercooling are to be studied, and the related physical model will be established. Applying the quenching technology to quench the undercooled melt before rapid solidification, incombination with cold deformation, we study the characteristics of crystal defects and the mechanism of recovery and recrystallization under the annealing condition and solid-state recrystallization, then expanding the theory and technology of the intrinsic link between the non-equilibrium solidification and solid-state recrystallization transformation.