TY - JOUR
T1 - Microstructural change of ultrafine-grained aluminum during high-speed plastic deformation
AU - Tsuji, N.
AU - Toyoda, T.
AU - Minamino, Y.
AU - Koizumi, Y.
AU - Yamane, T.
AU - Komatsu, M.
AU - Kiritani, M.
N1 - Funding Information:
The present study was financially supported by Industrial Technology Research Grant Program in ‘01 from New Energy and Industrial Technology Development Organization (NEDO) of Japan, under project ID 01A23025d.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2003/6/15
Y1 - 2003/6/15
N2 - Effect of strain rate on microstructural change in deformation of the ultrafine grained (UFG) aluminum produced by severe plastic deformation (SPD) was studied. Commercial purity 1100 aluminum sheets were highly strained up to an equivalent strain of 4.8 by the Accumulative Roll-Bonding (ARB) process at ambient temperature. The ARB-processed sheets were found to be filled with pancake-shaped ultrafine grains surrounded by high-angle grain boundaries. The ultrafine grains had a mean grain thickness of 200 nm and a mean grain length of 1100 nm. The ultrafine-grained aluminum sheets were deformed at various strain rates ranging from 2 to 6.0 x 104 s-1 by conventional rolling, ultra-high-speed rolling, and impact compression. High-speed plastic deformation generates a large amount of heat, inducing coarsening of the ultrafine grains during and after deformation. On the other hand, it was also suggested that high-speed plastic deformation is effective for grain-subdivision, in other words, ultra-grain refinement, if the effect of heat generation is extracted.
AB - Effect of strain rate on microstructural change in deformation of the ultrafine grained (UFG) aluminum produced by severe plastic deformation (SPD) was studied. Commercial purity 1100 aluminum sheets were highly strained up to an equivalent strain of 4.8 by the Accumulative Roll-Bonding (ARB) process at ambient temperature. The ARB-processed sheets were found to be filled with pancake-shaped ultrafine grains surrounded by high-angle grain boundaries. The ultrafine grains had a mean grain thickness of 200 nm and a mean grain length of 1100 nm. The ultrafine-grained aluminum sheets were deformed at various strain rates ranging from 2 to 6.0 x 104 s-1 by conventional rolling, ultra-high-speed rolling, and impact compression. High-speed plastic deformation generates a large amount of heat, inducing coarsening of the ultrafine grains during and after deformation. On the other hand, it was also suggested that high-speed plastic deformation is effective for grain-subdivision, in other words, ultra-grain refinement, if the effect of heat generation is extracted.
KW - Grain growth
KW - Grain subdivision
KW - Heat generation
KW - Impact compression
KW - Rolling
KW - Severe plastic deformation
KW - Ultra-high-speed plastic deformation
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U2 - 10.1016/S0921-5093(02)00709-8
DO - 10.1016/S0921-5093(02)00709-8
M3 - Article
AN - SCOPUS:0038807902
VL - 350
SP - 108
EP - 116
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -