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High-strain-rate Superplastic Flow in 6061 Al Composite Enhanced by Liquid Phase

Published online by Cambridge University Press:  31 January 2011

W.J. Kim ,
S.H. Hong ,
H.G. Jeong  and
S.H. Min
W.J. Kim
Affiliation:
Dept. of Metallurgy and Materials Science, Hong-Ik University, 72–1, Sangsu-dong, Mapo-ku, Seoul, 121–791, Korea
S.H. Hong
Affiliation:
Dept. of Material Science and Engineering, Korea Advanced Institute of Science and Technology,Kusung-dong, Yusung-ku, Taejon, 305–701, Korea
H.G. Jeong
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan
S.H. Min
Affiliation:
Dept. of Metallurgy, Kangnung National University, Kangwon-do, Kangnung, 210–702, Korea
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Abstract

High-strain-rate superplastic behavior of powder-metallurgy processed 0%, 10%, 20%,and 30% SiC particulate reinforced 6061 Al composites was studied over a range of temperatures from 430 to 610 °C. The strength of the 6061 Al composites was lowerthan that of the 6061 Al matrix alloy in the temperature range where grain boundarysliding is believed to control the plastic flow. The difference in their strength was alsoobserved to be temperature dependent, increasing with increase in temperature.Abnormally high activation energy for superplastic flow was another important featureof the 6061 Al composites. These behaviors in particle weakening and activationenergy have strong resemblance to those noted in the high-strain-rate superplastic 2124Al composites studied previously. The observed particle weakening was attributed toliquid-enhanced superplastic flow and discussed by adopting the concept of effectivediffusivity considering mass flow through liquid phase formed at the solute-segregatedregion near SiC/Al interfaces.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 1 , January 2002 , pp. 65 - 74
Copyright
Copyright © Materials Research Society 2002

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