TY - GEN
T1 - EBSD and TEM characterization of ultrafine grained high purity aluminum produced by accumulative roll-bonding
AU - Kamikawa, N.
AU - Huang, X.
AU - Tsuji, N.
AU - Hansen, N.
AU - Minamino, Y.
PY - 2006/1/1
Y1 - 2006/1/1
N2 - High purity aluminum (99.99% purity) was severely deformed by accumulative roll-bonding (ARB) to a thickness reduction of 98.4%. Quantitative microstructural characterization of the deformed sample was carried out by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). EBSD scans at various locations from the sample surface to the mid-thickness revealed a fairly uniform and equiaxed structure, although a small fraction of an elongated structure parallel to rolling direction (RD) was also observed. Misorientation angle distributions for grain boundaries of which misorientation angle was larger than 2° were evaluated by EBSD, showing that more than 70% of the boundaries were high-angle ones (>15°). More detailed structural features, such as low-angle boundaries (<2°) and dislocations between boundaries were characterized by TEM. The TEM results indicated that about 17% of the boundaries have misorientations <2° and that the fraction of high-angle boundaries is about 52%. An estimated yield strength based on the structural parameters determined by TEM was in good agreement with the measured value.
AB - High purity aluminum (99.99% purity) was severely deformed by accumulative roll-bonding (ARB) to a thickness reduction of 98.4%. Quantitative microstructural characterization of the deformed sample was carried out by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). EBSD scans at various locations from the sample surface to the mid-thickness revealed a fairly uniform and equiaxed structure, although a small fraction of an elongated structure parallel to rolling direction (RD) was also observed. Misorientation angle distributions for grain boundaries of which misorientation angle was larger than 2° were evaluated by EBSD, showing that more than 70% of the boundaries were high-angle ones (>15°). More detailed structural features, such as low-angle boundaries (<2°) and dislocations between boundaries were characterized by TEM. The TEM results indicated that about 17% of the boundaries have misorientations <2° and that the fraction of high-angle boundaries is about 52%. An estimated yield strength based on the structural parameters determined by TEM was in good agreement with the measured value.
KW - Accumulative roll-bonding (ARB)
KW - EBSD
KW - High purity aluminum
KW - Microstructural characterization
KW - TEM
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U2 - 10.4028/0-87849-996-2.91
DO - 10.4028/0-87849-996-2.91
M3 - Conference contribution
AN - SCOPUS:35848929947
SN - 0878499962
SN - 9780878499960
T3 - Materials Science Forum
SP - 91
EP - 96
BT - Advanced Structural and Functional Materials Design - Proceedings of the International Symposium on Advanced Structural and Functional Materials Design, 2004
PB - Trans Tech Publications Ltd
T2 - International Symposium on Advanced Structural and Functional Materials Design, 2004
Y2 - 10 November 2004 through 12 November 2004
ER -