STABILIZATION OF THE $gamma$-PHASE IN TERNARY ALLOYS WITH MOLYBDENUM- URANIUM BASE (in French)
The stablity of the gamma -phase in uranium-molybdenum alloys was found to be increased by a ternary addition. The effects of chromium, niobium, rhenium, ruthenium, ard zirconium were studied. The molybdenum content was progressively reduced so as to maintain a constant atomic concentration of solute; the alloys fall into three groups containing, respectively, 14, 16, and 18 at.% of solute. Only zirconium reduced the stability of the gamma phase, and it is also the only one among the solutes listed which has a larger atomic radius than uranium. It appears that the metastability of the gamma -phase in the alpha + gamma ' field arises primarily from the contraction of the cubic lattice through the substitution of small atoms. In the concentration range investigated. it appears that there is for each favorable ternary solute an optimum concentration, beyond which the stability does not increase futher or else tends to return towards the value characteristic of the binary Mo-U alloy. The stabilizing capacity of the addition elements is relatively greater as the total concentration of addition elements is smaller. The comparison of the different alloys from the point of view of reactivity was made. For a given loss of reactivity the replacement of molybdenum by ruthenium allowed the period of incubation to be increased by a factor of 5. (auth)
- Research Organization:
- Centre d'Etudes Nucleaires, Saclay, France
- NSA Number:
- NSA-14-007794
- OSTI ID:
- 4185232
- Journal Information:
- J. Nuclear Materials, Journal Name: J. Nuclear Materials Vol. Vol: 1
- Country of Publication:
- Country unknown/Code not available
- Language:
- French
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