Abstract
An investigation has been carried out of the tensile and fatigue fracture behavior and of the influence of water environments on fatigue strength of a SiC whisker reinforced high strength AlZnMg alloy composite (SiC w/7075-T6) fabricated by a powder metallurgy process. Apart from the elongation at failure, the mechanical properties of the composite were superior to those of an unreinforced 7075-T6 alloy. The fatigue strength in air of the composite at a stress ratio of 0·1 was higher than that of an unreinforced aluminum alloy. At lower stress level, a water environment decreased the fatigue strength of the composite, although the strength was superior to that of an unreinforced aluminum alloy in air. A fatigue crack initiated at a whisker cluster or a crack normal to the loading axis directly initiated at the specimen surface. In water, a fatigue crack was initiated at a corrosion pit.
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