Hot Working Behavior of Discontinuous Sic/Al Composites Obtained by Rheocasting
Composites based on the Al-7Si-0.6Mg alloy and reinforced by short SiC (NICALON) fibers were processed by rheocasting giving the matrix a globular microstructure. Tensile tests were performed at high temperatures with various strain rate. The presence of fibers impeds the plastic deformation giving rise to strong strain hardening effect and low strain rate sensitivity compared to the unreinforced matrix deformed in the highest range of temperature. The observation of a stronger activation energy for the composites is correlated with the modification of residual stresses within the matrix.
KeywordsResidual Stress Flow Stress Unreinforced Matrix Strain Rate Sensitivity Exponent Steady State Flow Stress
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