Hydrogen as a local probe: Diffusion and short-range order in Ti sub 1 minus y V sub y alloys
Journal Article
·
· Physical Review (Section) B: Condensed Matter; (USA)
- Natuurkundig Laboratorium, Vrije Universiteit te Amsterdam, NL-1081HV Amsterdam, The Netherlands (NL)
Diffusion coefficients of hydrogen have been measured in disordered Ti{sub 1{minus}{ital y}}V{sub {ital y}} alloys, as a function of temperature, hydrogen concentration, and alloy composition. Diffusion and electron microprobe analysis data indicate the existence of short-range order (clustering) in Ti{sub 1{minus}{ital y}}V{sub {ital y}} alloys, as observed before in the related Ti{sub 1{minus}{ital y}}Nb{sub {ital y}} alloy system by diffusive x-ray scattering. The diffusion data are analyzed by means of a model, incorporating site-dependent activation energies, effective hydrogen-hydrogen interactions, and selective-blocking factors, generalized for alloys with short-range order. Site energies are calculated by means of the embedded-cluster model, assuming the energy of the hydrogen atoms to be predominantly determined by the nearest-neighbor metal atoms. An approximate relation between the short-range-order parameter {sigma} and the site distribution is established. For {sigma}{lt}0 a chain'' model and for {sigma}{gt}0 a cluster'' model are in good agreement with Monte Carlo calculations. Using the short-range-order parameter {sigma} as the only fit parameter, the short-range order in Ti{sub 1{minus}{ital y}}V{sub {ital y}} alloys is determined from diffusion and solubility data. The quantitative determination of the short-range order in Ti{sub 1{minus}{ital y}}V{sub {ital y}} alloys and Mo{sub 1{minus}{ital y}}Ti{sub {ital y}} alloys from diffusion and solubility data, which are in excellent agreement with diffusive x-ray scattering data, shows that hydrogen can be a valuable tool to investigate the microscopic structure of concentrated disordered alloys.
- OSTI ID:
- 5556405
- Journal Information:
- Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:6; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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