Phase formation and stability in sputter deposited Be--Nb compounds
- Pacific Northwest Laboratory, Battelle Memorial Institute, Richland, Washington 99352 (United States)
The phase relations and thermal stabilities of phases in sputter deposited Be--Nb alloys (3--14% Nb) have been studied. An amorphous phase forms during deposition at ambient temperatures (30 {degree}C) for compositions {gt}5% Nb. Metastable crystalline phases form during deposition at 350--450 {degree}C as well as during annealing of the amorphous phase. One metastable bcc phase designated as Be{sub 12}Nb{prime} can be explained by an extremely high fault density in the Be{sub 12}Nb structure and is a precursor phase to the formation of both Be{sub 12}Nb and Be{sub 17}Nb{sub 2}. Another metastable bcc phase also forms during high temperature deposition. Transformation to the equilibrium phases occurs at temperatures {gt}800 {degree}C. A stoichiometric range of about 5.5--7.8% is indicated for the Be{sub 12}Nb phase and is probably due to vacancies on the Nb sublattice. No evidence of a Be{sub 5}Nb phase was found and the Be{sub 17}Nb{sub 2} phase is stable to room temperature.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5007585
- Journal Information:
- Journal of Materials Research; (United States), Journal Name: Journal of Materials Research; (United States) Vol. 7:1; ISSN JMREE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
AMORPHOUS STATE
BERYLLIUM ALLOYS
BERYLLIUM BASE ALLOYS
BINARY ALLOY SYSTEMS
INTERMETALLIC COMPOUNDS
NIOBIUM ALLOYS
PHASE STUDIES
PHYSICAL PROPERTIES
SPUTTERING
STABILITY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMODYNAMIC PROPERTIES