TC11钛合金片层组织热变形球化机制

Globularization Mechanisms during Hot Deformation Processes of TC11 Alloy with Lamellar Structure

摘要:

采用TEM、SEM和EBSD等组织分析技术研究了β退火态片层组织TC11钛合金两相区热变形球化过程中组织的精细结构和晶界特征。结果表明，片层组织的球化过程包括α片内小角度晶界形变和回复亚结构的形成、β相沿亚晶界扩散和晶界滑动作用下片层的解体以及晶界扩散和滑动驱动下α晶粒的球化和组织的均匀化。EBSD测试结果揭示了片层组织两相区热变形的球化机制为α相的连续动态再结晶和β相的动态回复或不连续动态再结晶过程

Abstract:

Microstructure and grain boundary character during hot deformation globularization processes of TC11 alloy with annealed-lamellar structure were investigated by TEM, SEM and EBSD techniques. The results indicate that globularization processes include: 1) forming of sub-structures with low-angle boundaries by deformation and recovery in α plates; 2) disintegrating of α plates by diffusion and slipping along grain boundaries; 3) globularizing of α grains and homogenizing of structure by diffusing and slipping along grain boundaries. EBSD testing results indicate that globularization mechanisms during hot deformation processes of the alloy with lamellar structure are continuous dynamic recrystallization occurring in α plates and dynamic recovery or discontinuous dynamic recrystallization occurring in β phase