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陆莹,李松夏,乔红超,曲楠,赵吉宾,胡太友.TiAl合金激光冲击强化表面微观形貌演变分析[J].稀有金属材料与工程(英文),2019,47(3):841~846.[LuYing,Lisongxia,Qiao hongchao,Qunan,Zhaojibin and hutaiyou.The surface microstructure evolution analysis of TiAl alloy by laser shock peening[J].Rare Metal Materials and Engineering,2019,47(3):841~846.]
The surface microstructure evolution analysis of TiAl alloy by laser shock peening
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Received:August 17, 2017  Revised:March 21, 2018
Key words: TiAl  alloy, laser  shock processing, protrusions, microstructure, plastic  deformation
Foundation item:辽宁省自然科学基金资助(项目号2015020115);国家重点研发计划资助(项目号2016YFB1102704)
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LuYing,Lisongxia,Qiao hongchao,Qunan,Zhaojibin and hutaiyou  
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      The evolution of surface microstructure of the poly crystals formed in TiAl alloy which is treated by laser shock processing is studied in this paper. After a single laser shock peening treated, there are some uneven distributed briefs in the pits formed on the surface of the sample was found, the relative height of briefs ranges from 100 nm to 300 nm and the raised edge is an annular boss. When the samples are treated with different energy density lasers, research on the protrusions showed that the numbers increased significantly and the relative height have an increasing tendency, and the average surface roughness of the pits increased obviously. Further study on the changes in shape of multiple impacts with the spot overlap rate of 50% reveals that the number of briefs significantly reduced compared with a single laser shock processing treatment, and the surface roughness is slightly increased. This is because the elastic deformation and plastic deformation tends to be saturated with the increase in the number of laser shock processing treatment, and the elastic deformation part gets rebound. The formation mechanism of the surface protrusions is analyzed, and the uneven plastic deformation flow model and shock wave superposition model are established. The surface topography formed by laser shock processing is the result of the coupling effect of the two models.