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材料研究学报  2014, Vol. 28 Issue (3): 166-172    DOI: 10.11901/1005.3093.2013.660
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激光冲击成形对AZ31镁合金微观结构和残余应力的影响*
张青来1(),洪妍鑫1,王荣1,李兴成1,段钧剑1,张永康2
1. 江苏大学材料科学与工程学院 镇江 212013
2. 东南大学机械工程学院 南京 210096
Effect of Laser Shock Forming on Microstructure and Residual Stress of AZ31 Magnesium Alloy Sheet
Qinglai ZHANG1,**(),Yanxin HONG1,Rong WANG1,Xingcheng LI1,Junjian DUAN1,ZHANG Yongkang2
1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013
2. School of Mechanical Engineering, Southeast University, Nanjing 210096
引用本文:

张青来,洪妍鑫,王荣,李兴成,段钧剑,张永康. 激光冲击成形对AZ31镁合金微观结构和残余应力的影响*[J]. 材料研究学报, 2014, 28(3): 166-172.
Qinglai ZHANG, Yanxin HONG, Rong WANG, Xingcheng LI, Junjian DUAN, ZHANG Yongkang . Effect of Laser Shock Forming on Microstructure and Residual Stress of AZ31 Magnesium Alloy Sheet[J]. Chinese Journal of Materials Research, 2014, 28(3): 166-172.

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摘要: 

采用最大输出能量为12.5 J的Nd-YAG激光器对AZ31镁合金薄板进行激光冲击成形(LSF), 用高分辨率透射电镜分析和研究了试样冲击区表面状态和微观结构。结果表明: 在镁合金薄板LSF冲击区凹面出现了纹理清晰的周期性波纹结构, 波纹间距为纳米级, 在LSF过程中伴随着亚晶、纳米晶和形变孪晶的产生。分析了冲击凹面残余应力分布, 并探讨了LSF过程中镁合金形成表面波纹现象和纳米晶形成的原因。

关键词 金属材料AZ31镁合金激光冲击成形表面波纹纳米结构残余应力    
Abstract

Thin AZ31 magnesium alloy sheet is laser-shock-formed (LSF) by means of a Nd-YAG pulse laser beam with a maximum output energy of 12.5 J. The surface morphology and microstructure in the shocked zone were characterized by optical microscopy and high resolution transmission electron microscopy. The results show that, periodic ripple structure with clear texture and nanoscale space appeared on concave in LSF shocked zone, with which the growth of sub-grains, nanocrystallites and deformation twins might be accompanied. The distribution of residual stress in the shocked concave was analyzed, and the relevant mechanism concerning ripple phenomenon and nanocrystallites formation during LSF was also discussed.

Key wordsmetallic materials    AZ31 magnesium alloy    laser shock forming (LSF)    surface ripple    nanostructure    residual stress
收稿日期: 2013-09-12     
基金资助:* 国家自然科学基金51175231 资助项目。
作者简介:

本文联系人: 张青来, 教授

图1  AZ31镁合金薄板的组织
图2  激光冲击成形试验装置示意图
图3  AZ31镁合金薄板激光冲击成形试样
图4  不同能量激光LSF后冲击区镁合金波纹分布TEM像
图5  激光能量为9 J和连续4次冲击区域的横断面组织
图6  LSF冲击区域镁合金组织结构TEM像和电子衍射花样
图7  原始镁合金板料组织TEM像
图8  不同次数激光冲击表面的残余应力分布和模拟结果
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