Microstructure and Hardness of Laser Shocked Ultra-fine-grained Aluminum

材料科学技术（英）, 2011, 27(9): 793-796.

Microstructure and Hardness of Laser Shocked Ultra-fine-grained Aluminum

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China

2.School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China／State Key Laboratory of Metastable Mater-ials Science and Technology, Yanshan University, Qinhuangdao 066004, China

3.School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China

4.School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China

5.School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China

6.Department of Mechanical Engineering, University of South Florida, Tampa FL 33620, USA

基金项目: Financial support from the National Natural Science Foundation of China(50801021)

关键词：显微硬度 , 激光冲击 , 超精细 , 显微组织 , 透射电子显微镜 , 铝 , 微观结构 , 超细晶粒

Microstructure and Hardness of Laser Shocked Ultra-fine-grained Aluminum

Keywords： Ultra-fine grains , Commercial purity aluminum , Laser processing , Microstructure , Hardness ,

Ultra-fine-grained commercial purity aluminum was produced by severe cold rolling, annealing and then strain- ing at ultra-high rate by a single pass laser shock. Resulted microstructure was investigated by transmission electron microscopy. Microhardness of annealed 0.6μm ultra-fine grained aluminum increased by 67% from 24 to 40 HV. Many 0.3 μm sub-grains appeared at the shock wave center after a single pass laser shock, while high density dislocation networks were observed in some grains at the shock wave edges. Accordingly, microhardness at the impact center increased by 37.5% from 40 to 55 HV. From the impact center to the edge, microhardness decreased by 22% from 55 to 45 HV.

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Microstructure and Hardness of Laser Shocked Ultra-fine-grained Aluminum

Microstructure and Hardness of Laser Shocked Ultra-fine-grained Aluminum

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