コンポキャスティング法による粒子分散型アルミニウム合金基複合材料の製造および諸特性

Abstract

An attempt to fabricate particle dispersed Al-4mass% Cu alloy composites was made by compocasting. The recovery of particles introduced in the molten metal is governed by the particle size, fraction solid of the metal and Mg concentration in the metal. Mg 0.5mass% is required in the metal to ensure homogeneous dispersion of SiC particles 40μm in size in the molten metal. A spinel product MgAl2O4 is observed at the Al2O3 particle-Al interface, but no reaction product is found at the SiC-Al interface. The wear loss of the composites decreases with increases in size and content of dispersed Al2O3 particles so significantly that 2017 alloy containing 2.5mass% of Al2O3 particles is equivalent to FC25 cast iron in wear loss. Rolling of Al2O3 particle dispersed 2017 alloy composites results in a decrease in tensile elongation with increases of size and content of particles. The strength of the alloy containing dispersed Al2O3 20μm in size from 0 to 7.5mass% decreases only slightly by rolling.