THE URANIUM-RHENIUM ALLOY SYSTEM
The phase diagram of the unanium-- rhenium alloy system is presented along with a discussion on transformation kinetics of the unanium solid solutions. The phase diagram is of the double eutectic type with the intermediate phase having the composition URe/sub 2/. This phase exhibits allotropy at 180 deg C and melts congruentiy at 2200 deg C. URe/sub 2/ reacts sluggishly with the unanium solid solutions below 750 deg C to form the peritectoid compound U/sub 2/ Re. Eutectic reactions occur at 1105 and 2105 deg C at respective compositions of 10.5 and 85.5 wt.% Re. Eutectoid reactions occur at 543 and 681 deg C at compositions of 1.4 and 8 wt.% Re, respectively. The maximum solubility of rhenium in alpha unanium is about 0.4 wt.% at 643 deg C and in BETA uranium is 1.9 wt.% at 681 deg C. The solubility of rhenium in gamma uranium is 6 wt.% at 681 deg C and increases to about 7 wt.% at 975 deg C. The solubility of uranium is rhenium is 0.6 wt.% at room temperature with little variation up to 2000 deg C. Alloys of BETA and gamma uranium containing more than about 1.2 and 7 wt.% Re, respectively, can be readily supercooled to room temperature. Rapid cooling of gamma alloys containing less than about 7 wt.% Re resulted in a direct gamma yields alpha ' transformation, the alpha ' state being a supersaturated alpha phase having a banded microstructure. Evidence is presented for the existence of two transition stutes, one involving the gamma phase decomposition and the other the BETA yields alpha transformation. Also, the sequence of phase changes involved in cooling the uranium solid solutions is discussed. (auth)
- Research Organization:
- Ames Lab., Ames, Iowa
- DOE Contract Number:
- W-7405-ENG-82
- NSA Number:
- NSA-17-037511
- OSTI ID:
- 4647063
- Report Number(s):
- IS-474
- Country of Publication:
- United States
- Language:
- English
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CHEMICAL REACTIONS
COOLING
DECOMPOSITION
EUTECTICS
EUTECTOIDS
HIGH TEMPERATURE
INTERMETALLIC COMPOUNDS
LATTICES
METALS, CERAMICS, AND OTHER MATERIALS
PERITECTOIDS
PHASE DIAGRAMS
REACTION KINETICS
RHENIUM
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SOLID SOLUTIONS
SOLUBILITY
TEMPERATURE
THERMODYNAMICS
URANIUM
URANIUM ALLOYS
URANIUM-ALPHA
URANIUM-BETA
URANIUM-GAMMA