The mutual solubilities of titanium and boron in pure aluminum
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10. J. D. Boyd: Trans. ASM, 1969, vol. 62, p. 977. of the h y d r o g e n - o r d e r e d m a t e r i a l m e a s u r e d f r o m 11. R. Gevers, P. Delavlgnette, H. Blank, J. Van Landuyt, and S. Amelinckx' Phys. Kikuchi l i n e s with B = (1010> is 0.808/~ c o m p a r e d with Status Sohdi, 1964, vol. 5, p. 595. 0.805.~ d e t e r m i n e d by X - r a y p o w d e r t e c h n i q u e s . On the b a s i s of the r e s u l t s of M a r g o l i n and P o r t i s c h s on T i - A I a l l o y s , h y d r o g e n would be e x p e c t e d to occupy t e t r a h e d r a l i n t e r s t i c e s in TisSn. H o w e v e r , the a b s e n c e of o r d e r i n g r e f l e c t i o n s o t h e r than (0001) and {1121} i m p l i e s that the unit c e l l h a s not changed. Thus, using the Ti3Sn unit c e l l , s t r u c t u r e f a c t o r s have been c a l c u l a t e d for the c o m m o n r e f l e c t i o n s a s s u m i n g a single h y d r o g e n a t o m p e r unit cell in a l l p o s s i b l e t e t r a h e d r a l i n t e r s t i c e s and u s i n g v a l u e s for the e l e c t r o n i c s c a t t e r N. J . FINCH ing a m p l i t u d e s of T i , Sn, and H taken f r o m Smith and B u r g e . 9 The s t r u c t u r e f a c t o r s a r e given in T a b l e I for mutual s o l u b i l i t i e s of t i t a n i u m and b o r o n in one c a s e . A 1 - T i - B t e r n a r y m e l t s w e r e d e t e r m i n e d over the t e m A h y d r o g e n c o n c e n t r a t i o n in solution of 11 at. pct or p e r a t u r e r a n g e 700 ~ to 1300~ and the r e s u l t s i n t e r 2000 ppm by weight i s n e c e s s a r y to e n a b l e each Ti3Sn p r e t e d in t e r m s of the a s s u m p t i o n (for which t h e r e is unit c e l l to contain one h y d r o g e n a t o m . T h i s i s not unc o n s i d e r a b l e e v i d e n c e ~) that the s o l u b i l i t i e s of t h e s e r e a s o n a b l e for a t i t a n i u m a l l o y ; indeed it has been e l e m e n t s a r e l i m i t e d by t h e i r r e a c t i o n t o g e t h e r to f o r m shown that a T i - 8 AI-1 Mo-1 V a l l o y c o n t a i n s 800 p p m t i t a n i u m d i b o r i d e (TiB2) p r o b a b l y containing a l u m i n i u m hydrogen in s o l i d solution b e f o r e h y d r i d e p r e c i p i t a t i o n d i b o r i d e . In the method u s e d , t e r n a r y m e l t s w e r e o c c u r s . 1~ F u r t h e r m o r e , T i - 1 2 . 5 A1 can a b s o r b ~4400 s a m p l e d at p r o g r e s s i v e l y l o w e r e d t e m p e r a t u r e l e v e l s ppm h y d r o g e n , of which at l e a s t 2700 p p m is thought to a f t e r allowing t i m e for t i t a n i u m d i b o r i d e p r e c i p i t a t e d be d i s s o l v e d in the Ti3A1 p h a s e , without f o r m i n g h y to s e t t l e out. d r i d e s , s In the f o r m e r a l l o y h y d r i d e f o r m a t i o n during 10 kg m e l t s w e r e m a d e f r o m s u p e r p u r i t y a l u m i n i u m electropotishing has been reported. 1 (99.99 pct) and A1-3.6 p e t T i and AI-I p c t B m a s t e r It i s i n s t r u c t i v e to c o
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