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Influence of rare earth element additions on phase transformations in the Zn−27% Al alloy

Published online by Cambridge University Press:  03 March 2011

Yao Hua Zhu  and
Frank E. Goodwin
Yao Hua Zhu
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico
Frank E. Goodwin
Affiliation:
International Lead Zinc Research Organization, Inc., Research Triangle Park, North Carolina 27709-2036
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Abstract

Rare earth additions of 3 wt. % were added to the Zn−27% Al−2% Cu−0.02% Mg alloy, known as ZA-27. The as-cast microstructure of this alloy consisted of two phases of supersaturated face-centered cubic β′s and α′s together with a hexagonal close-packed rare-earth-containing zinc-rich phase termed E phase. The phase transformations in this alloy after aging at 100 °C and 200 °C were determined. The E phase was determined to have the lattice parameters a0 = 9.0348 Å and c0 = 13.2194 Å, giving c0/a0 = 1.4632. The chemical formula of the E phase was determined to be RE1Zn10.9Cu0.8. The addition of 3% rare earths into ZA-27 delayed the phase transformations of this alloy. This was caused by an increase in the aluminum content of the supersaturated β′s phase.

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Type
Articles
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Journal of Materials Research , Volume 8 , Issue 12 , December 1993 , pp. 3043 - 3049
Copyright
Copyright © Materials Research Society 1993

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