Affiliation:
1. Kyushu University
2. Nippon Steel Corporation
3. University of Southampton
Abstract
Equal-channel angular pressing (ECAP) is a valuable technique for refining grain sizes
to the submicrometer or the nanometer range. This study explores the reason for the difference in
the grain refining behavior between pure Al and pure Cu. First, very high purity levels were adopted
in order to minimize any effects of impurities: 99.999% for Al and 99.99999% for Cu. Second, high
purity (99.999%) Au was also used in order to examine the effect of stacking fault energy. All three
pure metals were subjected to ECAP and microstructural observations and hardness measurements
were undertaken with respect to the number of ECAP passes. It is concluded that the stacking fault
energy plays an important role and accounts for the difference in the grain refining behavior in the
ECAP process.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
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