DISLOCATION MECHANISM OF SURFACE MODIFICATION FOR COMMERCIAL PURITY ALUMINUM  AND ALUMINUM ALLOY BY LASER SHOCK PROCESSING

doi:10.3724/SP.J.1037.2013.00035

Acta Metall Sin

2013, Vol. 49

Issue (6): 667-674 DOI: 10.3724/SP.J.1037.2013.00035

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DISLOCATION MECHANISM OF SURFACE MODIFICATION FOR COMMERCIAL PURITY ALUMINUM AND ALUMINUM ALLOY BY LASER SHOCK PROCESSING

LUO Xinmin¹⁾, CHEN Kangmin^1,2), ZHANG Jingwen¹⁾, LU Jinzhong ³⁾, REN Xudong ³⁾,LUO Kaiyu³⁾, ZHANG Yongkang⁴⁾

1) School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013
2) Analysis and Test Center, Jiangsu University, Zhenjiang 212013
3) School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013
4) School of Mechanical Engineering, Southeast University, Nanjing 211189

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LUO Xinmin, CHEN Kangmin, ZHANG Jingwen, LU Jinzhong,REN Xudong,LUO Kaiyu, ZHANG Yongkang. DISLOCATION MECHANISM OF SURFACE MODIFICATION FOR COMMERCIAL PURITY ALUMINUM AND ALUMINUM ALLOY BY LASER SHOCK PROCESSING. Acta Metall Sin, 2013, 49(6): 667-674.

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Abstract

Surface modification experiment of the commercial purity aluminum (α-Al) and Al-Cu-Mg alloyed aviation aluminum alloy 2A02 by laser shock processing (LSP) was implemented. The surface strengthening effect of both the target materials was investigated from dislocation mechanisms of microstructural response by means of TEM method. The results show that the strengthening effect of the two kinds of materials by laser shock processed is significantly different. The strengthening mechanism of α-Al by laser shock can be attributed to the multiplication of a large number of dislocations. With the increase of the impact number of laser shock and the degree of deformation, the new-generated dislocations will pile up and interact with the forest dislocations, and the dislocation lines will gradually evolve into waved-like, or wind into dislocation tangles and dislocation networks. But the hardness curve of the laser shocked (α-Al) will fast and linearly decline due to Bauschinger effect (BE) and stress wave damping. The laser shock strengthening mechanisms of the aging-hardened aluminum alloy 2A02 can be summarized to the enhancement of the matching between the elastic energy of dislocations with the ultra-high energy of laser shock processing due to the higher matrix strength and the dislocation-pinning effect of large number of dispersed precipitates, as well as the complex dislocation networks in between the precipitates constructed by the dislocations induced by laser shock. The matrix strengthened by laser shock processing and the precipitates keep the extra-semi-coherent relationship to coordinate the total deformation, with the number of laser shock increase, dislocation multiplication and the vacancy motion constitutes geometrically necessary boundaries (GNBs), which consists of the sub-grain boundaries to refine the matrix into the nanometer-grains. The strengthening mechanism of surface modification of aluminum alloy by laser shock processing is formed of the internal stress state caused by the combination of the complex dislocation configurations and the Hall-Petch effect of the nanocrystalline grains.

Key words: commercial purity aluminum (α-Al) aluminum alloy laser shock processing surface modification, dislocation microstructure

Received: 24 January 2013

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	LUO Xinmin
	CHEN Kangmin
	ZHANG Jingwen
	LU Jinzhong
	REN Xudong
	LUO Kaiyu
	ZHANG Yongkang

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00035 OR https://www.ams.org.cn/EN/Y2013/V49/I6/667

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