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The Effect of Scandium on the Microstructure of Ti3Al

Published online by Cambridge University Press:  01 January 1992

Paul R. Munroe
Paul R. Munroe*
Affiliation:
School of Materials Science and Engineering, University of New South Wales, P.O.Box 1, Kensington, NSW 2033, Australia.
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Abstract

Using Pettifor Maps as a guide to alloying, scandium additions were made to Ti3Al to try and transform the crystal structure of this intermetallic alloy from ordered hexagonal to ordered face centred cubic. Scandium was found to have a solid solubility limit of about 6.4at.% in Ti3Al and preferentially occupy the titanium sublattice. According to the A3B Pettifor Map, these are criteria which should effect a change in crystal structure, however no such transformation was observed. Scandium additions in excess of the solid solubility limit resulted in the formation of SC2AI at grain boundaries and triple points.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 391
Copyright
Copyright © Materials Research Society 1995

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