Diffusion of titanium and niobium in b.c.c. Ti-Nb alloys

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date

2011

Author dc:creator

• Pontau, Arthur Erwin

Contributors dc:contributor

• Lazarus, David

• titanium
• niobium
• bcc alloys
• diffusion coefficients
• lathe sectioning techniques

Statement dc:rights

• 1978 Arthur Erwin Pontau

Language dc:language

en

Identifier

356013

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/25594