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Phase constitutions of rapid solidification/powder metallurgy Mg–Zn–Ca–RE alloys

Tao Zhou, Mingbo Yang, Hua Xia, Jianjun Hu and Zhenhua Chen

Mg-6Zn-5Ca-3Ce and Mg-6Zn-5Ca-3Ce-0.5La (wt.%) alloys in the form of rods were prepared by hot extrusion of rapidly solidified powders, produced via atomization of the alloy melt and subsequent splat-quenching between a pair of water-cooled copper rollers. The microstructures and phase constitutions of the alloys were investigated. The results showed that the thermally stable MgxZnyREz phase with a small amount of Ca was present in the alloys, and its formation may be due to the dissolving of Ca in MgxZnyREz phase. For the Mg-6Zn-5Ca-3Ce alloy, the grain size ranged from 350 nm to 1 μm. With an addition of 0.5 wt.% La, the microstructure of the alloy was refined, for which the grain size ranged from 300 nm to 500 nm, mainly resulting from the increase in both the number of RE-containing intermetallics and the melting point of the MgxZnyREz phase with a small amount of Ca.

c Correspondence address, Associate Professor Tao Zhou, College of Material Science and Engineering, Chongqing University of Technology, Chongqing, China, Tel.: +86-023-65030023, Fax: +86-023-65030023, E-mail:


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Received: 2012-8-8
Accepted: 2012-12-3
Published Online: 2013-01-08
Published in Print: 2013-08-08

© 2013, Carl Hanser Verlag, München