Metallurgy Division - [quarterly rpt Jul-Sep 1957]

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At room t e m p e r a t u r e the the r e s i s t a n c e s m e a s u r e d w e r e R e s i s t i v i t y of the C o r r o s i o n Films approximately 10" ohms in all on T i t a n i u m - Z i r c o n i u m Alloys c a s e s . At 290°C the r e s i s t a n c e tended to i n c r e a s e slightly with Initial R e s i s t i v i t y S p e c i m e n Composition t i m e in n e a r l y all c a s e s . 5 x 10" specimen 2 6 . 9 x 10" a r e given in Table XVI. 26 x 10" 25 21, 22. 1 x l o 9 ohm-cm f o r the l a t t e r .

D. Misch, J. E. Draley) Another s e t of r e s i s t a n c e m e a s u r e m e n t s was m a d e on c o r r o s i o n films of zirconium-base, low titanium alloys. Previously, these alloys w e r e examined a t 185O C a f t e r being corroded at 290' C. The specimens w e r e again exposed a t 29OOC f o r t i m e s f r o m 16 to 2 7 2 hours and film r e s i s tance was m e a s u r e d a t the s a m e t e m p e r a t u r e in vacuum. 52 F i g u r e 16. O Macro 22308 @TWO PHASE 710 t 2 Figure 1 7 000 Beta Region of the UraniumRuthenium P h a s e Diagram.

The alloy was fine grained and essentially single phase except f o r the p r e s e n c e of n u m e r o u s , uniformly distributed, small angular inclusions. The matrix grains again appeared to be retained gamma phase. The f a c t that no decomposition product was in evidence suggests that the alloy was either cooled m o r e rapidly f r o m the m e l t than castings N o . 5-1 and 8-1 o r that with lower carbon the eutectoid transformation is s u p p r e s s e d to lower t e m p e r a t u r e s .

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