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Site Occupancies in Ternary C15 Ordered Laves Phases

Published online by Cambridge University Press:  15 February 2011

P. G. Kotula ,
I. M. Anderson ,
F. Chu ,
D. J. Thoma ,
J. Bentley  and
T. E. Mitchell
P. G. Kotula
Affiliation:
Materials Science and Technology Division, Mail Stop K765, Los Alamos National Laboratory, Los Alamos, NM 87545
I. M. Anderson
Affiliation:
Materials Science and Technology Division, Mail Stop K765, Los Alamos National Laboratory, Los Alamos, NM 87545
F. Chu
Affiliation:
Materials Science and Technology Division, Mail Stop K765, Los Alamos National Laboratory, Los Alamos, NM 87545
D. J. Thoma
Affiliation:
Materials Science and Technology Division, Mail Stop K765, Los Alamos National Laboratory, Los Alamos, NM 87545
J. Bentley
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P O Box 2008, Oak Ridge, TN 37831
T. E. Mitchell
Affiliation:
Materials Science and Technology Division, Mail Stop K765, Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

Site occupancies in three C15-structured AB2(X) Laves phases have been determined with Atom Location by CHanneling Enhanced MIcroanalysis (ALCHEMI). In NbCr2(V), the results are consistent with exclusive site occupancies of Nb for the A sublattice and Cr and V for the A sublattice. The B-site occupancy of V can be interpreted in terms of electronic structure. In NbCr2(Ti), the results are consistent with Ti partitioning mostly to the A sites with some anti-site defects likely. In HfV2(Nb), the results are consistent with Nb partitioning between the A and A sites. The results of the ALCHEMI analyses of these ternary C15 Laves phase materials are discussed with respect to previously determined phase diagrams and first-principles total energy and electronic structure calculations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 617
Copyright
Copyright © Materials Research Society 1997

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References

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