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Published September 1996 | Published
Journal Article Open

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


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.

Additional Information

© 1996 Materials Research Society. (Received 17 August 1995; accepted 9 May 1996) The financial support from the Department of Energy (Grant No. DEFG0386ER45242) is greatly acknowledged.

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August 22, 2023
October 17, 2023