PURPOSE: To obtain a heat resistant ceramic-reinforced Al alloy composite material excellent in specific strength, specific modulus of elasticity, fatigue strength, strength and ductility by uniformly dispersing a ceramic in an Al alloy having a specified grain diameter as a matrix.
CONSTITUTION: A ceramic is uniformly dispersed in an Al alloy having ≤10μm grain diameter as a matrix. The ceramic is preferably dispersed at ≤40μm intervals and the proper volume fraction of the ceramic is about 5-40%. High strength ceramic particles of SiC, etc., having about ≤30μm particle diameter, short fibers or whiskers are used as the ceramic. The dispersing process can be carried out by powder metallugical processing using starting material having a small particle diameter, a molten metal impregnating method accompanied by proper grain refining heat treatment, a molten metal stirring method or a spray forming method. The objective ceramic-reinforced Al alloy composite material having high specific strength, a high specific modulus of elasticity and high fatigue strength and excellent in heat resistance, strength and ductility is obtd.
IWAMURA HIROSHI
KINO KEIJI
