Fabrication of TiB_2 participate reinforced magnesium matrix composites by powder metallurgy

摘要

Magnesium metal matrix composites (MMCs) reinforced with 10, 20 and 30 vol. percent TiB_2 participates, respectively, were fabricated by powder metallurgy. The microstracture, porosity, hardness and abrasive wear behavior of the composites were evaluated. Microstructural characterization of Mg MMCs showed generally uniform reinforcement distribution. As compared with pure Mg, the hardness (HB) values of Mg MMCs reinforced with 10, 20 and 30 vol. percent TiB_2 particulates were increased by 41 percent, 106 percent and 181 percent, respectively. The abrasive wear tests showed that the wear resistance of Mg MMCs is increased with the increasing of the reinforcement volume fraction. This was due to the strong particulate-matrix bonding and high hardness of the TiB_2 particulate.