Site occupancies in ternary C15 ordered Laves phases

Technical Report · Tue Dec 31 04:00:00 EST 1996

DOI:https://doi.org/10.2172/441755· OSTI ID:441755

Kotula, P G; Chu, F; Thoma, D J; Mitchell, T E ^[1]; Anderson, I M; Bentley, J ^[2]

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1. Los Alamos National Lab., NM (United States). Materials Science and Technology Div.
2. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

Site occupancies in three C15-structured AB{sub 2}(X) Laves phases have been determined by Atom Location by CHanneling Enhanced MIcroanalysis (ALCHEMI). In NbCr{sub 2}(V), the results were consistent with exclusive site occupancies of Nb for the A sublattice and Cr and V for the B sublattice. The B-site occupancy of V is not expected from atom size effects alone. In NbCr{sub 2}(Ti), the results were consistent with Ti partitioning mostly to the A sites with some anti-site defects likely. In HfV{sub 2}(Nb), the results were consistent with Nb partitioning between the A and B sites. The results of the ALCHEMI analyses of these ternary C15 Laves phase materials will be discussed with respect to previously determined phase diagrams and first-principles total energy and electronic structure calculations.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 441755
• Report Number(s): LA-UR--96-4068; CONF-961202--30; ON: DE97001690
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
HAFNIUM ALLOYS
INTERMETALLIC COMPOUNDS
LAVES PHASES
NIOBIUM ALLOYS
TITANIUM ALLOYS
VANADIUM ALLOYS