Microstructure and Mechanical Property of Nanocrystalline Surface Layer on 7A52 Aluminium Alloy

Abstract:

Surface nanocrystallization of 7A52 aluminium alloy was realized via non-equilibrium treatment induced by supersonic particles bombarding. Surface morphology and microstucture of the nanocrystalline surface layer were observed and analyzed by SEM, XRD and TEM, respectively. And the micro-hardness was tested using micro-hardness tester. The results indicated that the coarse grains on surface of 7A52 aluminium alloy could be refined to nanoscale via non-equilibrium treatment induced by supersonic particles bombarding. Average grain size on the superficial layer was approximately 40nm, micro-strain was about 0.12~0.14% and the thickness of nanocrystalline surface layer reached to approximately 80μm. Micro-hardness of the nanocrystalline surface layer was about 1.81times to that of the original substrate.

• Periodical: Key Engineering Materials (Volumes 562-565)
• Pages: 842-845
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.562-565.842
• Online since: July 2013
• Authors: Xiao Ming Wang, Sheng Zhu, Qing Chang, Xue Qiang Feng
• Keywords: Aluminium Alloy, Microstructure, Nanocrystalline

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