Abstract
Aging process of Al–1.0 mass% Mg2Si alloy composite materials with 4 vol% and 8 vol% Al2O3 particles was investigated by Vickers micro-hardness measurement and transmission electron microscope observation. When Al2O3 particles are dispersed into an Al–Mg–Si alloy, the age-hardenability was obviously lowered above at 473 K aging. The rectangular shaped spinels were observed at the interface between Al2O3 particles and the matrix. The overaged composite material with 4 vol% Al2O3 particles incluedes various kinds of metastable phase precipitates: namely β′ phase, the TYPE–B and TYPE–C precipitates of which crystal structures are different each other. Fraction of the three kinds of precipitates are the same as in the mother alloy containing 0.2 mass% excess Si. The composite material with 8 vol% Al2O3 particles contains the TYPE–A, TYPE–B and TYPE–C precipitates, but is free from β′ phase precipitates. The existence of those precipitates has correspondingly been observed in the mother alloy containing 0.4 mass% excess Si.
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