Effect of hot extrusion on microstructure and tribological behavior of Al2O3p reinforced 7075 aluminum-matrix composites

来源期刊:中南大学学报(英文版)2021年第8期

论文作者:闫洪 雷雨顺 魏志帆 熊俊杰 张鹏翔 万剑平 王志录

文章页码:2269 - 2284

Key words:7075 alloy; Al2O3p; composites; hot extrusion; microstructure; tribological behavior

Abstract: The effects of hot extrusion and addition of Al2O3p on both microstructure and tribological behavior of 7075 composites were investigated via optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and transmission electron microscopy (TEM). The experimental consequences reveal that the optimal addition of Al2O3p was 2 wt%. After hot extrusion, the Mg(Zn,Cu,Al)2 phases partially dissolve into the matrix and generate many uniformly distributed aging precipitation particles, the Al7Cu2Fe phases are squeezed and broken, and the Al2O3p become uniform distribution. The microhardness of as-extruded 2 wt% Al2O3p/7075 composites reaches HV 170.34, increased by 41.5% than as-cast composites. The wear rate of as-extruded 2 wt% Al2O3p/7075 composites is further lower than that of as-cast composites under the same condition. SEM-EDS analyses reveal that the reinforced wear resistance of composites can put down to the protective effect of the Al2O3p reinforced transition layer. After hot extrusion, the transition layer becomes stable, which determines the reinforced wear resistance of the as-extruded composites.

Cite this article as: LEI Yu-shun, YAN Hong, WEI Zhi-fan, XIONG Jun-jie, ZHANG Peng-xiang, WAN Jian-ping, WANG Zhi-lu. Effect of hot extrusion on microstructure and tribological behavior of Al2O3p reinforced 7075 aluminum- matrix composites [J]. Journal of Central South University, 2021, 28(8): 2269-2284. DOI: https://doi.org/10.1007/ s11771-021-4768-9.

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