STI I Q u a r t e r l y P r o g r e s s R e p o r t No. 4 Contract No. A T ( 1 1 -1 ) -1 0 9 2 -T a s k B -Submitted t o -U . S. Atomic E n e r g y C o m m i s s i o n Chicago Ope r a t i o n s Office 9800 South C a s s Avenue Argonne, Illinois 60439 Attention: M r . F r e d C. M a t t m u e l l e r D i r e c t o r , R e s e a r c h C o n t r a c t s Division ABSTRACT Investigation of the effect of c a r b o n and oxygen additions on the p h a s e r e l a t i o n s h i p s of the n i o b i u m -r i c h region of the niobium-tungstenhafnium and n i o b i u m -t u n g s t e n -z i r c o n i u m alloy s y s t e m s i s i n p r o g r e s s . T h e n i o b i u m -r i c h solid solution phase boundaries f o r the n i o b i u m -r i c h region of the niobium -tung st en-hafnium a n d niobium -tung st en-zi r conium s y s t e m s with the addition of nominal 0. 01 w/o C w e r e e s t a b l i s h e d m e tallographically a t 1600 and 1300 C ( 2 9 12 and 2372 F). S i m i l a r data f o r
Investigation of the effect of carbon and oxygen additions on the phase relationships of the niobium-rich region of the niobium-tungstenhafnium and niobium-tungsten-zirconium alloy s y s t e m s i s in p r o g r e s s. I s o t h e r m a l annealing at 1600 and 1300C (2912 and 2372F) of the niobiumtungsten-hafnium with nominal carbon additions of 0. 5 , 0. 25, 0. 1, 0.
annealed alloy s t r u c t u r e shows a second phase o r p h a s e s p r e s e n t in a l l the alloys investigated a t both t e m p e r a t u r e s except a Nb-0. 5 w/o W -0 . 5 w/o Hf-0. 01 w/o C which showed n e a r l y a single-phase s t r u c t u r e at 1600C (2912F). alloys containing nominal 0. 25, 0. 1 , 0. 05 and 0. 01 w/o C was heat t r e a t e d i s o t h e r m a l l y at both 1600 and 1300C (2912 and 2372F). annealed and quenched alloys examined metallographically exhibit the s t r u c t u r e s with p r e c i p i t a t e s , varying i n the amounts and mode of p r e c ipitation. X -r a y diffraction studies of the carbon-bearing alloys i n the two s y s t e m s a r e i n p r o g r e s s . hafnium and niobium-tungsten-zirconium alloys with oxygen additions will be c a r r i e d out throughout the next period.Microscopic examination of the A limited number of the niobium-tungsten-zirconium All the Arc-melting of the niobium-tungsten-
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