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TRANSFORMATION OF METASTABLE PHASES IN THE URANIUM-MOLYBDENUM ALLOY SYSTEM

Technical Report ·
OSTI ID:4775569
; ; ;
The transformation of three metastable phases in quenched Mo--U alloys was studied using metallographic, x-ray, and hardness techniques. At 450 deg C, transformation of the metastable phases in the 5, 10, and 15 at.% molybdenum alloys to the equilibrium alpha + gamma' structure was accompanied by marked increases in hardness. The metallographic changes accompanying transformation in the 5 and 10 at.% molybdenum alloys were not sufficient to account for the hardness changes and it is inferred that sub-microscopic particles of an unidentified phase were precipitated. Transformation of the 25 and 30 at.% molybdenum alloys was accompanied by only minor changes in hardness. However, two metallographic forms of the gamma' phase were obtained in the 25 at.% molybdenum alloy when transformed at 450 and 550 deg C, respectively. At 450 deg C the gamma' had a banded appearance whereas at 550 deg C it was acicular. The x-ray identification of the equilibrium alpha phase in the 25 at.% molybdenum alloy transformed at 550 deg C for times in excess of 100 days was in agreement with the equilibrium diagram proposed for the Mo--U system in which the gamma decomposed by an eutectoid reaction to alpha and gamma'. (auth)
Research Organization:
United Kingdom Atomic Energy Authority. Research Group. Atomic Energy Research Establishment, Harwell, Berks, England (United Kingdom)
NSA Number:
NSA-16-032108
OSTI ID:
4775569
Report Number(s):
AERE-M/R-2840
Country of Publication:
United Kingdom
Language:
English

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Related Subjects

CONFIGURATION
EUTECTICS
EUTECTOIDS
HARDNESS
HEAT TREATMENTS
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
PHASE DIAGRAMS
PRECIPITATION
QUENCHING
REACTION KINETICS
TEMPERATURE
THERMODYNAMICS
URANIUM ALLOYS
VARIATIONS
X RADIATION