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Title:Diffusion of titanium and niobium in b.c.c. Ti-Nb alloys
Author(s):Pontau, Arthur Erwin
Doctoral Committee Chair(s):Lazarus, David
Department / Program:Physics
Discipline:Physics
Degree:Ph.D.
Genre:Dissertation
Subject(s):titanium
niobium
bcc alloys
diffusion coefficients
lathe sectioning techniques
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.
Issue Date:1978
Genre:Dissertation / Thesis
Type:Text
Language:English
URI:http://hdl.handle.net/2142/25594
Rights Information:1978 Arthur Erwin Pontau
Date Available in IDEALS:2011-06-30
Identifier in Online Catalog:356013


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