STUDY OF THE THORIUM-URANIUM ALLOY SYSTEM
>The thorium-uranium phase diagram has been determined from 0 to 2/ wt.% uranium. A new hightemperature region in the phase disgram is proposed. The data were obtained from resistivity and lattice parameter measurements. Metallography indicates that uranium has a slight solubility in thorium, that is, abont 1% at room temperature. The excess uranium occurs as a finely divided second phase in arc-melted alloys. The fine particles coalesce when the alloys are held at 600 deg C for several months, a thermal treatment which might be encountered in the operation of a nuclear power reactor. Mechanical property measurements indicate that thorium is strengthened at room temperature and at 500 deg C by adding uranium; three or four percent uranium added io thorium increases the sirength of thorium about 50% at the respective temperatures. The thermal conductivity for several alloys was calculated as a function of temperature, using resistivity data and the Weidemann-Franz relation. The thermal conductivity of thorium was found to increase approximately linearly from 0.090 at 100 deg C to 0.110 cal/cm/ deg C/sec at 1100 deg C. (auth)
- Research Organization:
- Atomics International Div., North American Aviation Inc., Canoga Park, Calif.
- NSA Number:
- NSA-12-014819
- OSTI ID:
- 4308340
- Report Number(s):
- A/CONF.15/P/706
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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