激光冲击处理对AZ31B镁合金力学性能的影响  

Effect of Laser Shock Processing on Mechanical Properties of AZ31B Magnesium Alloy

作　　者：葛茂忠[1,2] 项建云[1,2] 张永康[1] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013 [2]常州轻工职业技术学院模具系,江苏常州213164

出　　处：《材料工程》2013年第9期54-59,共6页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(50735001;50675089;50975127)

摘　　要：为了研究激光冲击处理对AZ31B镁合金力学性能的影响,采用波长为1054nm,脉冲宽度为15ns,脉冲能量为10J,光斑直径为3mm的YAG脉冲激光,对变形镁合金AZ31B薄板试样表面进行冲击处理。结果表明:根据优化的工艺参数,激光冲击处理能在AZ31B镁合金上制备出纳米结构表层,表面晶粒尺寸约为20nm;试样表面激光诱导的残余压应力高达-125MPa;激光冲击处理试样的抗拉强度提高了16.9%;屈服强度提高了16.3%;表面硬度提高了91.8%。利用透射电镜(TEM)、扫描电镜(SEM)观测激光冲击试样微观结构,并分析了力学性能提高的机理。In order to investigate the effect of laser shock processing（LSP） on mechanical properties of AZ31B magnesium alloy. AZ31B magnesium alloy sheets were treated by using Nd：YAG laser with a wavelength of 1054nm, a pulse width of 15ns, a pulse energy of 10J and a spot diameter of 3mm. The results show that a nanostructured surface layer can be produced on an AZ31B magnesium alloy by using the optimized laser parameters,and the surface grain size is about 20nm. Residual compressive stress induced by LSP at the surface of the specimen is up to --125MPa. The tensile strength and the yield strength are improved by 16.9% and 16.3%, respectively. Surface microhardness is improved by 91. 8%. The microstructures of specimens by LSP were analyzed by TEM and SEM, and the mechanism which caused the mechanical properties improvement was discussed.

关 键 词：激光冲击处理 AZ31B镁合金 晶粒细化 残余压应力 抗拉强度 

分 类 号：TN249[电子电信—物理电子学] TG113.2[金属学及工艺—物理冶金]