Effect of Mg on Microstructures and Abrasive Resistance of In-situ Synthesis TiC-Al2O3/Al Composites
ZHANG Rui-ying1, CHEN Su-juan1, SHI Zhi-ming1, ZHANG Lian-feng2
1. Key Laboratory of Light Metal Materials, School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
2. Inner Mongolia First Machinery Group Corporation, Baotou 014030, Inner Mongolia, China
Abstract：TiC and Al2O3 particles reinforced aluminum matrix composite was synthesized from TiO2,C,Al and Mg powder by the in-situ method. The effects of Mg on the microstructure and abrasive resistance of TiC-Al2O3/Al composite were investigated using XRD,SEM and wear testing. The results show that Mg influences the reaction process and the second phase distribution. The abrasive resistance of the composites increases with increasing Mg content. When Mg content in green compacts reaches 1.0% (mass fraction),the reinforcement particles are the most uniform and the smallest. The average size of reinforcement particles is about 2μm. The abrasive resistance of composites is optimal and the abrasion loss is only 1/6 of the matrix. However,with the further increase of Mg content,the abrasion resistance of composites decreases inversely due to producing coarse needle-like Al3Ti.
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