THE PRECIPITATION OF METASTABLE ALPHA PHASE DURING THE GAMMA TO GAMMA PRIME TRANSFORMATION IN URANIUM-16 wt pct MOLYBDENUM

Journal Article · Mon Oct 01 04:00:00 EDT 1962 · Trans. Met. Soc. AIME

OSTI ID:4772376

Kramer, D; Rhodes, C G

The kinetics of precipitation of transient alpha phase during the gamma -to- gamma -transformation in U--18 wt % Mo between 400 and 550 deg C were studied using quantitative metallography and electrical resistivity measurements. The volume percent of alpha phase goes through a maximum in time, corresponding to a critical degree of progress of gamma ' formation, prior to its re-solution after prolonged annealing. The fastest rate of alpha precipitation occurs at 500 deg C with a concomittant lowest peak of 9.5 vol% alpha . At 450 deg C, 14 vol% alpha , greatest for any temperature, was observed after 24 hr with an associated slowest rate of formation. alpha precipitation at 400 deg C ceases after approximately 180 hr, and the amount of alpha present remains unchanged after long times at temperature; no gamma ' was observed metallographically at this temperature. (auth)

• Research Organization: Atomics International, Canoga Park, Calif.
• NSA Number: NSA-17-001987
• OSTI ID: 4772376
• Journal Information: Trans. Met. Soc. AIME, Journal Name: Trans. Met. Soc. AIME Vol. Vol: 224
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANNEALING
ELECTRIC CONDUCTIVITY
MEASURED VALUES
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
PHASE DIAGRAMS
PRECIPITATION
REACTION KINETICS
TEMPERATURE
TRANSIENTS
URANIUM ALLOYS