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Amorphization and metastable polymorphs of ordered intermetallics Zr3Al and Ni3Al

Published online by Cambridge University Press:  03 March 2011

E. Ma
E. Ma
Affiliation:
Materials Group, Department of Mechanical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803-6413
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Abstract

Observations of various metastable crystalline and amorphous polymorphs of Ll2-type intermetallics Zr3Al and Ni3Al are summarized. The difference in the tendency of these two alloys to become amorphous is obvious. Regardless of the nonequilibrium routes employed for synthesis and processing, amorphous Zr3Al is obtained easily, while amorphization of Ni3Al is rare. An analysis of thermodynamic and kinetic factors responsible for the observed polymorph selection and amorphization behavior is presented. The inadequacy of a simplified model proposed earlier is also discussed.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 3 , March 1994 , pp. 592 - 597
Copyright
Copyright © Materials Research Society 1994

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