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Precipitation of bcc nanocrystals in bulk Mg–Cu–Y amorphous alloys

Published online by Cambridge University Press:  31 January 2011

Wenshan Liu  and
William L. Johnson
Wenshan Liu
Affiliation:
W. M. Keck Laboratory of Engineering, 138–78, California Institute of Technology, Pasadena, California 91125
William L. Johnson
Affiliation:
W. M. Keck Laboratory of Engineering, 138–78, California Institute of Technology, Pasadena, California 91125
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Abstract

Coexistent amorphous and nanoscale bcc-Mg7Li3 phases were found in slowly quenched alloys of the Mg65–xLixCu25Y10 system containing 3 to 15 at. % Li. The crystallization behavior of these alloys has been studied. The grain size of the nanocrystalline bcc phase which is formed ranges from 2 to 20 nm. The volume fraction of nanocrystalline phases as well as the grain size of the nanocrystals increase as the Li composition increases. Transmission electron microscopy studies suggest that the alloy exhibits phase separation in the undercooled liquid state and that the nucleation and growth of the bcc-nanocrystals is related to the phase separation. Some characteristic thermal properties of the glassy phase are presented, and the composition dependence of Tg and Tx is discussed. It is concluded that the addition of a small amount of Li is essential for the production of a bcc nanocrystalline phase in the Mg–Li–Cu–Y system.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 9 , September 1996 , pp. 2388 - 2392
Copyright
Copyright © Materials Research Society 1996

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References

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