Diffusion of titanium and niobium in b.c.c. Ti-Nb alloys
Pontau, Arthur Erwin
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https://hdl.handle.net/2142/25594
Description
Title
Diffusion of titanium and niobium in b.c.c. Ti-Nb alloys
Author(s)
Pontau, Arthur Erwin
Issue Date
1978
Doctoral Committee Chair(s)
Lazarus, David
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
titanium
niobium
bcc alloys
diffusion coefficients
lathe sectioning techniques
Language
en
Abstract
The diffusion coefficients for titanium and niobium radioactive tracers were simultaneously measured in Ti, Ti94.6,
Ti80.4, Nb19.6 and Ti64.3Nb35.7 over the temperature range from 9S0°C to 1511°C using
643 3S standard lathe sectioning techniques. The samples were initially heat treated by annealing above the a-B phase transition temperature and then either cooling slowly to room temperature or quenching. The room temperature crystal morphology was then examined using x-ray diffraction. Alloy concentrations were chosen both to suppress the B-a transition and to obtain the metastable w-phase. [DATA]The hypothesized enhancement of diffusion by w-phase fluctuations or effects of the h.c.p. to b.c.c. phase transformation cannot be ruled out by this work, but are certainly not supported directly by the present results.
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