激光冲击LY12CZ和纯铝的正电子湮没特性  

POSITRON ANNIHILATION CHARACTER OF LY12CZ AND PURE Al PROCESSED BY LASER SHOCK

作　　者：刘富荣[1,2] 邹鸿承[1,2] 戴蜀娟 杨晓[1,2] 彭寿战 

机构地区：[1]华中理工大学激光技术国家重点实验室 [2]广州建筑职工大学

出　　处：《中国有色金属学报》1997年第2期122-124,共3页The Chinese Journal of Nonferrous Metals

摘　　要：采用快快正电子湮没仪分别测定了ＬＹ１２ＣＺ和纯铝经激光冲击处理后的正电子谱，激光冲击使ＬＹ１２ＣＺ和纯铝的平均寿命降低而捕获率提高，表明激光冲击使材料内部的缺陷浓度增加且缺陷浓度与激光功率密度呈指数关系。激光冲击硬化是由于激光冲击后在材料内部形成大量位错等缺陷，这些位错相互缠结在一起，相互钉扎，形成稳定的胞状组织。Positron lifetime spectra of LY12CZ and pure Al with laser shock processing(LSP) by positron annihilation instrument were measured, that the average lifetime decreased with increasing traping rates showed that the defect densities in the materials with LSP were improved. Besides, the relation between the laser power density and the defect densities was analysed, the effect of laser shock hardening was also investigated and explored.

关 键 词：激光冲击 LSP 正电子谱 铝 湮没 激光器 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TN249[金属学及工艺—金属学]