Constitution of Uranium and Thorium Alloys

Abstract

DISCLAIMERPortions of this document may be illegible in electronic image products. Images are produced from the best available original document. PREFACE"Constitution of Uranium and Thorium Alloys" (BMI-1300) s u p e rs e d e s "Compilation of US and UK Uranium and Thorium Constitution D i a g r a m s " (BMI-1000). m a t . The original "Compilation" h a s been used extensively and h a s been reprinted. ance of the original work implies acceptance of the concept and approach. attempt to provide an even m o r e useful r e f e r e n c e piece. e c e s s o r , t h i s work was written with the cooperation of r e p r e s e n t a t i v e s of the United Kingdom.It i s a new r e f e r e n c e piece in a modified f o r -The p r e s e n t a u t h o r s believe that this degree of acceptAs a r e s u l t , they have undertaken this "Compilation" i n a n Like i t s p r e d -The modified Metals Handbook s y s t e m of notation f o r the diag r a m s employed i n BMI-1000 w a s again used i n p r e p a r i n g these constitutional diagrams. The symbols a / o f o r atomic p e r cent and w / o for weight p e r cent have been used. In keeping with the g e n e r a l convention, p h a s e s have been designated beginning with the base. The inconvenience of having two alpha phases, alpha A and alpha B, i n the s y s t e m A -B is thereby obviated. Some slight but e a s i l y reconciled confusion m a y e x i s t with previous data w h e r e the d i a g r a m m a y have been developed f o r the s y s t e m B -A. T h i s "Compilation" is divided into two m a j o r sections, u r a n i u m alloys and thorium alloys. c u s s i o n of the t r a n s f o r m a t i o n and melting t e m p e r a t u r e s of the b a s e metal. Following the discussion a r e the v a r i o u s s y s t e m s i n alphabetical order. The m a j o r sections include both binary and t e r n a r y systems.basis of whether o r not constitutional d i a g r a m s w e r e available. t h i s "Compilation" i t w a s determined that l e s s weight should be given to the p r e s e n c e o r absence of a d i a g r a m and that utilization of the information was m o s t readily accomplished by a completely alphabetical listing.The m a j o r sections a r e preceded by a disIn the previous edition the s y s t e m s w e r e s e p a r a t e d on the F o r Generally, only unclassified r e f e r e n c e s have been used. Howe v e r , because the unclassified l i t e r a t u r e is incomplete f o r s e v e r a l s y s t e m s , some classified r e f e r e n c e s a r e given. It is believed that future declassifications m a y m a k e many now-classified r e f e r e n c e s readily available. H i s i n t e r e s t s and efforts i n bringing the origi- ACKNOWLEDGMENTS 4T h e authors a r e indebted to m a n y of the p e r s o n n e l of the U. S. AEG and its cont r a c t o r s . The presentation is basically a cooperative effort. P a r t i c u l a r thanks are due E. E p r e m i a n , f o r m e r l y of the U. S. AEC R e s e a r c h Division; G. K. URANIUM-PALLADIUM. . . URANIUM-PHOS...

Thermophysical Properties of Snap Fuel Materials.

“…The results of measurements nnade on unhydrided zirconium-uranium alloy, •The S and € hydride phases are not to be confused with the S and e phases of the unhydrided material (see References 8,24, and 48 for phase diagrams). …”

THE U-Pu-C TERNARY PHASE DIAGRAM BELOW 50 ATOMIC PERCENT CARBON. Final Report of Metallurgy Program 9.3.8

“…The U-C phase diagram, given in Figure 2, (30) shows only the monocarbide up to 50 a/o carbon; there is no appreciable carbon solubility in the terminal uranium phases.v^) The Pu-C diagram, Figure 3, has been established by Mulford et al(26) in the region that is pertinent to the present work there is a monocarbide, which exists as a phase deficient in 13 carbon, and another intermediate phase, ^, having the formula PU3C2. Carbon is not appreciably soluble in any of the plutonium allotropic modifications.…”

Differential Scanning Calorimetry Study of U–Cr Alloys

“…On the contrary, the binary U-Cr system assumes special importance for a different reason, as Cr constitutes the second major element in nuclear grade 9Cr-based ferritic-martensitic steels [2]. A survey of extant literature on U-Cr binary system reveals that bcc-Cr does not dissolve appreciably even in the high temperature c-bcc phase of uranium, owing probably to size effect [3][4][5][6][7][8][9][10][11][12]. In addition, uranium is also insoluble in chromium, due to disparity in electronic structure characteristics [7,8].…”

“…A survey of extant literature on U-Cr binary system reveals that bcc-Cr does not dissolve appreciably even in the high temperature c-bcc phase of uranium, owing probably to size effect [3][4][5][6][7][8][9][10][11][12]. In addition, uranium is also insoluble in chromium, due to disparity in electronic structure characteristics [7,8]. Interestingly, chromium is one of the few transition elements that form a simple eutectic phase diagram with uranium, without any intermediate phase [3,4,7].…”

“…In addition, uranium is also insoluble in chromium, due to disparity in electronic structure characteristics [7,8]. Interestingly, chromium is one of the few transition elements that form a simple eutectic phase diagram with uranium, without any intermediate phase [3,4,7]. Further, the presence of temperature induced polymorphic transitions in uranium, namely a(orthorhombic) ?…”