TEM Characterization of Dynamic Recrystallization in TiB<sub>2</sub>Particles after Hypervelocity Impact

• 作者: D. L. Sun J. F. Li L. L. Hou Q. Guo
• 来源期刊: 显微镜研究(英文)
• 学科: 工学
• 关键词: Impact TIB2 Particle Dynamic RECRYSTALLIZATION
• 年，卷（期）: 2014,（3）
• 页码范围: 51-55
• 页数: 5页
• 分类号: TG14

摘要

Characteristic of dislocations and dynamic recrystallization in TiB2 particles associated with hypervelocity impact craters in 65 vol.% TiB2/Al composite were investigated by transmission electron microscopy (TEM). As high temperature due to hypervelocity impact can make the dislocation climb, a bunch of vacancies were generated and then gathered to form vacancy slice, finally formed dislocation rings. In addition, by climbing, edge dislocations rearranged themselves into wall vertical with slip plane, which finally forms sub grain boundary. Moreover, big angle grain boundaries were observed, which demonstrates that dynamic recrystal grains were formed in impacted TiB2 particles. As a result, deformation behavior of TiB2 particles in 65 vol.% TiB2/Al composite under hypervelocity impact includes generation of dislocation, slip and climb of dislocation, and dynamic recrystallization.