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The structure and fracture mode of rapidly solidified Pt3Ga

Published online by Cambridge University Press:  31 January 2011

C. L. Briant ,
A. I. Taub  and
E. L. Hall
C. L. Briant
Affiliation:
General Electric Company, Research and Development Center, Schenectady, New York 12301
A. I. Taub
Affiliation:
General Electric Company, Research and Development Center, Schenectady, New York 12301
E. L. Hall
Affiliation:
General Electric Company, Research and Development Center, Schenectady, New York 12301
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Abstract

This paper reports a study of the structure and fracture mode of Pt3Ga. The results show that the structure of this compound is a tetragonal distortion of the L12 structure with lattice parameters of a = 5.47 Å and c = 7.89 Å. If the gallium concentration decreases from 22.8 at.% to 21.5 at.%, a disordered face-centered cubic phase also forms. This phase is Pt-rich and appears to form along the grain boundaries of the Pt3Ga phase. The fcc phase can also contain coherent Pt3Ga precipitates. Single phase Pt3Ga fails in a very brittle manner, and the fracture mode is intergranular. Boron additions have no effect on the fracture mode, since boron does not segregate to the grain boundaries. The fracture of an alloy containing a small amount of the disordered fcc phase is also brittle, but the fracture mode is predominantly transgranular.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 12 , December 1990 , pp. 2841 - 2848
Copyright
Copyright © Materials Research Society 1990

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