AZ80-T6挤压镁合金激光冲击温强化和低周疲劳行为  

Warm Laser Shock Peening and Low Cycle Fatigue Behavior of Extruded AZ80-T6 Magnesium Alloy

作　　者：张青来[1] 刘惠[1] 张冰昕 李兴成[3] 王荣[1] 邵伟[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]上海交通大学密西根学院,上海200240 [3]江苏理工学院机械工程学院,江苏常州213000

出　　处：《中国激光》2015年第11期61-68,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(51175231)

摘　　要：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 processing on low cycle fatigue behavior of extruded AZ80- T6 magnesium alloy, laser shock peening （LSP） and warm laser shock peening （WLSP） have been carried out on fatigue specimens using Nd： glass laser as well as tensile-tensile fatigue test. The results show that residual compressive stresses generated by LSP and WLSP at 300 ℃ are -125 MPa and -158 MPa, and their fatigue lifes are improved by 11.42% and 75.74%, respectively. The crack initiation time is delayed obviously by WLSP so that fatigue life of AZ80-T6 alloy is improved. Laser shock induced microstructures of magnesium alloy and low cycle fatigue behavior are analyzed and discussed.

关 键 词：激光技术 AZ80镁合金 激光冲击温强化 残余压应力 低周疲劳行为 微观结构 

分 类 号：TN249[电子电信—物理电子学] TG146.2[一般工业技术—材料科学与工程]