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Influence of Hot Extrusion on Microstructure and Hardness of SiC Particle Reinforced Al-Zn-Mg-Cu Alloy Matrix Composite

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Abstract:

In this paper, the microstructure and mechanical property of the Al-Zn-Mg-Cu aluminum matrix composite reinforced by SiC particles with the contents of 2.5, 4.5, and 6.5wt% through vacuum casting are studied. The homogenization treatment was conducted at 465°C heat insulation for 24h. The purpose of this study is to analyze hot extrusion influence on the microstructure and hardness of the Al-Zn-Mg-Cu aluminum matrix composite. SiCp under pre-processing possesses good wetability with the analysis of Laser Particle Sizer and XRD. Metallurgical microscope, XRD, SEM and EDS is applied to analyze the microstructure of the Al-Zn-Mg-Cu aluminum matrix composite. It has proved that the hot extrusion can effectively improve the homogenization of SiCp and dissolve the second rough phases to reinforce the dispersal of CuAl2 and MgZn2 phase. The hardness of Al/SiCp composite rises as the increase of the SiCp content. It is shown that when the SiCp content is above 5%, its hardness obviously reinforced as well as that of the Al/SiCp composite.

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Periodical:

Materials Science Forum (Volume 816)

Pages:

118-125

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.816.118

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Online since:

April 2015

Authors:

Xiao Hong Wang*, Jun Guo, Liang Luo, Min Ye, Yuan Hua Lin, Jian Peng, Xiong Han

Keywords:

Aluminium Matrix Composite, Hardness, Microstructure, SiCp

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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