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为了研究激光冲击对AZ80-T6挤压镁合金低周疲劳性能的影响,采用钕玻璃脉冲激光器对疲劳试样进行激光冲击强化(LSP)和激光冲击温强化(WLSP)处理,并进行拉-拉疲劳实验。结果表明:LSP和300℃时WLSP处理后镁合金表面产生的残余压应力分别为-125 MPa和-158 MPa,而其疲劳寿命分别比原始试样提高11.42%和75.74%。WLSP明显地延迟裂纹萌生时间,提高AZ80-T6镁合金的疲劳寿命。另外对激光冲击诱导的镁合金微观结构及其低周疲劳行为进行了分析和讨论。
In order to study the effect of laser shock on the low cycle fatigue behavior of AZ80-T6 magnesium alloy extruded by compression, Nd-glass pulsed lasers were used to treat the fatigue specimens by laser shock-lapping (LSP) and laser shock-tempering (WLSP) Fatigue experiment. The results show that the residual compressive stresses on the surface of magnesium alloy after LSP and WLSP treatment at 300 ℃ are -125 MPa and-158 MPa, respectively, while the fatigue life increases by 11.42% and 75.74% respectively compared with the original sample. WLSP obviously delayed the crack initiation time and improved the fatigue life of AZ80-T6 magnesium alloy. In addition, the microstructure of laser induced magnesium alloy and its low cycle fatigue behavior were analyzed and discussed.