Some Studies On The Uranium Thorium Zirconium Ternary Alloy System

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ISBN 13 :
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Download or read book Phase Diagrams of Certain Ternary Systems of Uranium and Thorium written by and published by . This book was released on 1958 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of investigation of alloy structures and phase diagrams of certain ternary systems, including uranium, thorium, and their refractory compounds, which are of interest in the search for materials for reactor fuel elements are presented. The attention was concentrated mainiy on the investigation of those parts of diagrams which referred to solid substance as being the most important for practical applications of alloys. The study of hardness, microstructure, and crystal lattice of alloys affer prolonged annealing at controlled temperatures and quenching was the chief method of the investigation. The general regularity governing the arrangement of typical crystal lattices of metals in the periodic table hold for equilibrium of binary solid solutions based on the alpha, BETA, and alpha modifications of uranium much the same as the binary systems of titanium, iron, and other polymorphous metals. Phase diagrams of ternary systems U-- Cr--Mo, U-- Zr-- Nb, U-- Zr-- Mo, U--Nb--Mo, and isothermic tetrahedrons for 800 and 1000 deg C of the quaternary system U--Zr--Nb--Mo are given to characterize the structure of most important alloys of uranium with the metals notable for their high solubility in gamma uranium and low thermal neutron cross sections. Some regularities of the existence of gamma solid solutions observed in these alloys are due to physical and chemical properties of their components and to the nature of their interaction. The experimental studies of certain thorium systems show that thorium hardly forms solid solutions with other metals due to the large size of its atom. Continuous series of solid solutions are found in binary systems Th--Ce and Th--Zr, and considerable degree of solubility at moderate temperatures is found in the Th--C system. In connection with this the constitution of ternary alloys Th--Zr--U, and Th-- U--C was studied. (auth).