The metallurgy and superconductivity of the Nb-Ti-Ta ternary alloy system were studied.
The Nb-Ti, and Ta-Ti binary samples, and Nb-Ti-Ta ternary samples were precipitation
heat treated under different schedules. After the precipitating heat treatment, the samples
were characterized by X-Ray Diffraction (XRD) techniques. Equilibrium binary and
ternary phase diagrams based on the different alloy compositions and heat treatment
temperatures were developed. The Ta-Ti binary phase diagram is very close to the ASM
standard phase diagram. The ��-phase boundary of Nb-Ti binary phase diagram developed
here is at a higher temperature relative to the ASM standard one. A working ternary
equilibrium phase diagram for the Nb-Ti-Ta system has been developed that is based on
the experimental measurements and quantitative thermodynamic calculations.
Measurements of superconducting critical temperature, Tc, show a good agreement with
previous measurements of Tc in the ternary alloys. / Graduation date: 2002
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/32437 |
| Date | 13 April 2001 |
| Creators | Li, Na |
| Contributors | Warnes, William H. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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