Affiliation:
1. University of Southern California
2. Indian Institute of Technology
3. University of California, Davis
Abstract
Al 5083 alloy powder was mechanically milled in liquid nitrogen to achieve a
nanocrystalline (NC) structure having an average grain size of 50 nm with high thermal stability,
and then consolidated by quasi-isostatic (QI) forging. The consolidation resulted in ultrafine grains
(UFG) of about 250 nm, and the bulk material exhibited enhanced strength compared to
conventionally processed Al 5083. The hardness of as-cryomilled powder and the UFG material
was measured by nanoindentation using loading rates in the range of 50−50,000 /N/s, and results
were compared with the conventional grain size alloy. Negative strain rate sensitivity was observed
in the cryomilled NC powder and the forged UFG plate, while the conventional alloy was relatively
strain rate insensitive.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Cited by
6 articles.
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