激光冲击处理对AZ31B镁合金力学性能的影响

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_T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。...

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Bibliographic Details
Published in材料工程 no. 9; pp. 54 - 59
Main Author 葛茂忠 项建云 张永康
Format Journal Article
LanguageChinese
Published 江苏大学机械工程学院,江苏镇江212013 2013
常州轻工职业技术学院模具系,江苏常州213164%江苏大学机械工程学院,江苏镇江,212013
Subjects
AZ31B镁合金
抗拉强度
晶粒细化
残余压应力
激光冲击处理
AZ31B镁合金
激光冲击处理
抗拉强度
residual compressive stress
tensile strength
残余压应力
laser shock processing
grain refinement
晶粒细化
AZ31B magnesium alloy
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ISSN1001-4381
1001-4381
DOI10.3969/j.issn.1001-4381.2013.09.011

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Summary: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_T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。
Bibliography:11-1800/TB
GE Mao-zhong, XIANG Jian-yun （1 School of Mechanical Engineering,Jiangsu University, Zhenjiang 2 2 Mould Department, Changzhou , ZHANG Yong-kang1 12013, Jiangsu, China; Institute of Light Industry Technology, Changzhou 213164 ,Jiangsu, China）
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 mec
ISSN:1001-4381
1001-4381
DOI:10.3969/j.issn.1001-4381.2013.09.011