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，从而提高材料的力学性能 The fast electron positron annihilation was used to measure the positron spectra of LY12CZ and pure aluminum after laser shock treatment. The laser shock reduced the average life of LY12CZ and pure aluminum and the capture rate increased, which indicated that laser shock caused the defect concentration Increasing and the defect concentration exponential relationship with the laser power density. Laser shock hardening is due to the formation of a large number of dislocations and other defects within the material after the laser shock, these dislocations intertwined with each other, pinged each other to form a stable cellular structure, thereby enhancing the mechanical properties of the material