The influence of thermomechanical processing on the elevated temperature mechanical behavior of 6061 aluminum - alumina metal matrix composite materials
Magill, Marvin D.
Kalu, P. N.
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A cast, aluminum-based discontinuous metal matrix composite was thermomechanically processed. The material studied was 6061 aluminum containing 10 vol. pct. or 15 vol. pct. alumina (Al2O3) particles, fabricated by casting and subsequently extruded by Duralcan, Inc. of San Diego, CA. Processing included rolling the extruded bars to large strain values at 350 C and 500 C with controlled reheating between passes. Mechanical testing was conducted at temperatures and strain rates ranging from 200 C to 500 C and 6.7 x 10-5 s-1 to 3.3 x 10-1 s-1, respectively. This material displayed a tendency for increased elongation with an increase in the strain rate above 6.7 x 10-4 s-1. Elongation data for the 350 C rolled materials, containing both 10 vol. pct. and 15 vol. pct. alumina, displayed greater values at lower temperatures than the 500 C rolled materials. Values for strength agreed well with previous results.
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