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The Influence of Interstitial Alloying Elements on the Phase Stability and Fracture Toughness of V3Au

Published online by Cambridge University Press:  28 February 2011

M. A. Kassem ,
Y. Fahmy  and
C. C. Koch
M. A. Kassem
Affiliation:
Materials Science & Engineering Department, North Carolina State University, Raleigh, North Carolina 27695
Y. Fahmy
Affiliation:
Materials Science & Engineering Department, North Carolina State University, Raleigh, North Carolina 27695
C. C. Koch
Affiliation:
Materials Science & Engineering Department, North Carolina State University, Raleigh, North Carolina 27695
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Abstract

Additions of the interstitial elements oxygen and carbon to the A15 structure V3Au intermetallic compound resulted in the formation of the L'2 perovskite structure. The composition of the L'12 phase is about 17.5 at.% oxygen. Analysis of x-ray diffraction line intensities indicated that the interstitial stabilized phase was L'12 perovskite structure rather than the L12, Cu3Au structure type. The microhardness of the L'12 phase is about 20% lower than that of the A15 phase and its fracture toughness is 2 to 3.5 times greater. The mechanism for the improved fracture toughness in the L'12 phase is the subject of continued research.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 186: Symposium I – Alloy Phase Stability and Design , 1990 , 369
Copyright
Copyright © Materials Research Society 1991

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