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Effect of Interstitials on the Phase Stability of Selected Intermetallics

Published online by Cambridge University Press:  26 February 2011

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

The possibility of modifying the complex crystal structure of selected refractory metal aluminides and silicides of AB3 stoichiometry by interstitial alloying additions was investigated. The compounds Nb3Si, V3Si, Mo3Si, Cr3Si, and Nb3Al were alloyed with oxygen or carbon up to about 20 atomic %. Alloying with oxygen or carbon in V3 Au was studied as a model for the A15 to Ll2 (or L'l2) structural change induced by interstitial alloying. Oxygen and carbon stabilized the perovskite, L'l2, structure in V3Au. Oxygen stabilized a L12 phase in Nb3Si while carbon induced a hexagonal structure phase. No L12 or L'12 phases were stabilized with the addition of oxygen or carbon in V3Si, Mo3Si, Mo3A1, Cr3Si, or Nb3Al. The Pettifor structural map for AB3 compounds was used to predict the structural changes in these compounds on alloying of oxygen or carbon.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 801
Copyright
Copyright © Materials Research Society 1991

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References

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