Grain Refinement of High-Purity FCC Metals Using Equal-Channel Angular Pressing

Abstract:

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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.

Info:

Periodical:

Materials Science Forum (Volumes 558-559)

Edited by:

S.-J.L. Kang, M.Y. Huh, N.M. Hwang, H. Homma, K. Ushioda and Y. Ikuhara

Pages:

1273-1278

DOI:

10.4028/www.scientific.net/MSF.558-559.1273

Citation:

Z. Horita et al., "Grain Refinement of High-Purity FCC Metals Using Equal-Channel Angular Pressing", Materials Science Forum, Vols. 558-559, pp. 1273-1278, 2007

Online since:

October 2007

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Price:

$35.00

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