Study of Transformation by Annealing of the Body-Centered Cubic $gamma$ Phase of Uranium-Molybdenum Alloys; ETUDE DES TRANSFORMATIONS PAR REVENU DE LA PHASE $gamma$ CUBIQUE CENTREE DES ALLIAGES URANIUM-MOLYBDENE
By annealing at different temperatures. a study was made of the transformations of the body-centered cubil gamma phase for two alloys containing 6 and 10 per cent denum by weight, respectively. There is a return to the equilibrium state by formation of the stable alpha orthorhombic and epsilon ordered tetragonal phases, following two types of reaction: pearlite transformation bv nucleation and growth from the grain boundaries, preponderant when the annealing takes place at temperatures above 400 deg C, and identical for the two types of alloys. This reaction has already been studied bv numerous authors, who have constructed the corresponding TTT curvesi and transformation inside the grains of the quenched solid solution when annealing takes place at 400 gamma C or beiow: 6 per cent alloy-precipitation of fine alpha phase particles. followed by progressive ondering of the solid solution enriched in molybdenum; 10 per cent alloy-formation of small ordered regions and then a fine alpha phase precipitate. In the course of this work particular attention was paid to the study of intragranular reuctions after low-temperature annealing, the reactions involved in this case not having been explained up to the present, The gamma phase transformation was studied by means of three techniques: micrography, microhardness tests, and x-ray diff raction. (auth)
- Research Organization:
- France. Commissariat a l'Energie Atomique, Paris
- NSA Number:
- NSA-14-011973
- OSTI ID:
- 4172404
- Report Number(s):
- CEA-1270
- Country of Publication:
- France
- Language:
- English
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Related Subjects
CRYSTALLIZATION
DIAGRAMS
DIFFRACTION
EUTECTICS
EXPANSION
GRAIN BOUNDARIES
GRAIN SIZE
HARDNESS
HEAT TREATMENTS
LATTICES
LOW TEMPERATURE
MATERIALS TESTING
METALS, CERAMICS, AND MATERIALS
MICROSCOPY
MOLYBDENUM ALLOYS
NUCLEATE BOILING
PEARLITE
PHASE DIAGRAMS
PRECIPITATION
QUENCHING
REACTION KINETICS
SOLID SOLUTIONS
TEMPERATURE
THERMODYNAMICS
URANIUM ALLOYS
X RADIATION