METALLURGY OF TUBALLOY URANIUM . Progress Report by Battelle Memorial Institute.; U.S. Atomic Energy Commission.

By Battelle Memorial Institute.; U.S. Atomic Energy Commission. Division of Technical Information.; United States. Dept. of Energy. Office of Scientific and Technical Information

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P r e s s u r e , t h e composition w a s Over t h i s range o f t e m p e r a t u r e s and p r e s s u r e s , t h e e q u i l i b r i a were T ~ N ~ . ~ ~ . completely r e v e r s i b l e . The lower n i t r i d e h a s n o t been s t u d i e d because of i t s h i g h s t a b i l i t y a t r e a d i l y a t t a i n a b l e temperatures. The f o l l o w i n g experiment i s t y p i c a l o f s e v e r a l t h a t demonstrate t h i s s t a b i l i t y : TuN1. 637 A sample known t o have t h e composition w a s pumped out w i t h an automatic Toepler pump connected t o t h e specimen chamber.

0 0 0 0 0 0 0 *. * = . e 0 0 Beta Phase of' T u b a l l o y --- . 6% Mo. F i l i n g s o f t h i s a l l o y were quenched from 690OC. and c l e a n e d i n n i t r i c a c i d , which was rembved by continuous d i l u t i o n and d e c a n t a t i o n . A sharp d i f f r a c t i o n p a t t e r n o f a low-symmetry s t r u c t u r e was obtained a t room t e m p e r a t u r e Some o f t h e same f i l i n g s were r e s e a l e d w i t h o n l v v e r y f a i n t t r a c e s of oxide.

O f t h e more important c o n c l u s i o n s a r e summarized here: In a c l o s e d system c o n t a i n i n g n i t r i d e p l u s n i t r o g e n ; t h e e q u i l i b r i u m The p r e s s u r e arid t e m p e r a t u r e depend upon t h e composition o f t h e n-i t r i d e phase. r = * .. n t a Riven t e m p e r a t u r e and p r e s s u r e i s reached a t 1 I - * i t i s n e c e s s a r y t o c a l c & a t e . t h e composition of t h e s o l i d phase from t h e known mass of r i i t r o p x i i n t h e gas phase.

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