采用1420铝锂合金板材制作成中心圆孔疲劳试件和金相试件进行激光冲击处理,通过冲击区外观电镜扫描、疲劳实验和显微硬度测试,结果发现,经激光冲击处理后,铝锂合金表面没有受强脉冲激光和冲击波的破坏,而显微硬度明显提高,疲劳性能大幅度改善,激光冲击处理后的强化区与光斑相当,深度约为1 mm.

In this paper, the fatigue specimens with center hole and metallography specimens made by sheet of 1420 Al-Li alloy were processed by intense pulse laser, then the surface of laser shock processed zone was observed by SEM, and the fatigue test and hardness measurement were processed. Results showed that the surface of 1420 Al-Li alloy sheet was not destroyed by intense laser or shock waves, while laser shock processing could improve the hardness and fatigue properties obviously, and strengthened zone was similar to the laser spot in size, and the hardened depth was up to about 1 mm.