Metal matrix composite and process for producing the same

摘要

A metal matrix composite comprising 2 to 80 volume % of alpha -alumina powder as a reinforcement, said alpha -alumina powder comprises polyhedral primary particles substantially having no fracture surface, D50 of alpha -alumina powder is 0.1 mu m to 50 mu m and a ratio of D50 to D10 is not more than 2, wherein D10 and D50 are particle sizes at 10% and 50% cumulation from the smallest particle side of a weight cumulative particle size distribution, respectively, and a process for producing the metal matrix composite which comprises infiltrating a molten metal into the alpha -alumina powder under pressure or non-pressure.