Hydrogen solubility in alpha titanium
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Hydrogen Solubility in Alpha Titanium RONALD S. V I T T AND K A N J I ONO
DESPITE
i n c r e a s i n g t e c h n o l o g i c a l i m p o r t a n c e of t i t a n i u m a l l o y s , c e r t a i r t b a s i c k n o w l e d g e of t h e s e a l l o y s h a s b e e n l a c k i n g . The b e h a v i o r of h y d r o g e n in ~ T i is one such e x a m p l e . T h i s note r e p o r t s the r e s u l t s of an e l e c t r i c a l r e s i s t i v i t y study of h y d r o g e n s o l u b i l i t y in c~-Ti, T h i s study w a s c o n d u c t e d a s p a r t of an e x t e n s i v e i n v e s t i g a t i o n on h y d r i d e p r e c i p i t a t i o n in t i t a n i u m . T h e t i t a n i u m u s e d w a s zone r e f i n e d 0.020 in, d i a m w i r e ( G r a d e I s p e c i f i c a t i o n ) o b t a i n e d f r o m the M a t e r i a l R e s e a r c h C o r p . , O r a n g e b u r g , N. Y. T h e n o m i n a l p u r i t y with r e s p e c t to a l l i m p u r i t i e s including i n t e r s t i t i a l s RONALD S. VITT, formerly Graduate Student, Materials Department, University of California, Los Angeles, Calif. is associated with Carbidex Corp., Southgate, Mich. KANJI ONO is Acting Associate Professor, Materials Department, University of California, Los Angeles. Manuscript submitted August 14, 1970. 608-VOLUME 2, FEBRUARY 1971
w a s 99.965 pct. The r e s i s t i v i t y r a t i o (pa00//p4.2) w a s 75 f o r m a t e r i a l containing l e s s than 1 p p m H. The s t a n d a r d . f o u r lead t ech n i q u e w a s u s e d w i t h n o m i n a l l y 7 in. long r e s i s t i v i t y s a m p l e s mounted in a s t a i n l e s s s t e e l c a p s u l e . A f t e r the s a m p l e s w e r e c l e a n e d with a c e t o n e and lightly etched with a 2 pct HNO3-2 pct HF aqueous solution, the capsule was sealed. The sample capsule was either evacuated for r e s i s t a n c e annealing or p r e s s u r i z e d with high p u r i t y h e l i u m gas f o r r e s i s t i v i t y m e a s u r e m e n t o r aging t r e a t m e n t . O n c e the s a m p l e s w e r e e n c a p s u l a t e d , no e x p o s u r e to a i r o c c u r r e d during the c o u r s e of the e x p e r i m e n t until t h e i r h y d r o g e n c o n tent w a s a n a l y z e d . T h e s a m p l e s w e r e r e s i s t a n c e a n n e a l e d at 550~ f o r 4 hr u n d er d y n a m i c v a c u u m of
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