Abstract
Tensile properties have been investigated in SiC particulate-reinforced cast A356 aluminum alloy composites with systematically controlled solidification structure and aging condition. Tests were also performed for an unreinforced matrix alloy for comparison. The composite exhibited increased elastic modulus, 0.1% proof stress and reduced elongation compared to the matrix alloy. Refinement of the solidification structure provided comparable improvement in proof stress, UTS and elongation values in both the composite and the matrix alloy. The Hall-Petch type relation was found between the proof stress and the dendrite arm spacing. The aging time dependence of the tensile properties of the composite was comparable to that of the matrix alloy. Consequently, each effect of particle reinforcements, solidification structure and age-hardening was successfully extracted from the overall yield stress increment of the composite.
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