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Effect of SN Additions on Superplasticity in Al-Mg-Mn-Sc Alloys

Published online by Cambridge University Press:  10 February 2011

C. H. Henager Jr. ,
J. S. Vetrano ,
V. Y. Gertsman  and
S. M. Bruemmer
C. H. Henager Jr.
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, [email protected]
J. S. Vetrano
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, [email protected]
V. Y. Gertsman
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, [email protected]
S. M. Bruemmer
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, [email protected]
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Abstract

Identical Al-Mg-Mn-Sc alloys without and with 0.034-wt% Sn additions were fabricated, heat-treated, and tensile tested in a fine-grain (d < 6 pm) condition at four strain rates from 10−2 to 10−4 s−1 and at temperatures from 723K to 823K. Alloys with Sn additions exhibited reduced failure strains at 723K but higher failure strains at 823K for the slowest strain rates. The effect of Sn on flow stress, activation energy for flow stress, and strain rate exponent was explored and was found to be small. The main effect of Sn was suggested to be in reducing cavitation by allowing a redistribution of stress at critical hetero-junctions in the alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 31
Copyright
Copyright © Materials Research Society 2000

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