Irregular growth of AlSb in solid aluminum-solid antimony diffusion couples
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T h e a l u m i n u m a n d the a n t i m o n y we u s e d i n t h i s i n v e s t i g a t i o n w e r e of 9 9 . 9 9 9 pct p u r i t y ; we m a d e a f e w diffusion runs with a l u m i n u m and a n t i m o n y s i n g l e c r y s t a l s w h i c h w e r e l e s s p u r e (99.9 p c t p u r e o r b e t t e r ) . I n p r e p a r i n g the s u r f a c e s of t h e d i f f u s i o n c o u p l e h a l v e s p r i o r t o b o n d i n g , we u s e d o n e of a v a r i e t y of f i n a l g r i n d i n g o r p o l i s h i n g p r o c e d u r e s , i n c l u d i n g the f o l l o w i n g : 1) C o a r s e g r i n d i n g w i t h n o . 600 e m e r y p a p e r ; 2) m e t a l l o g r a p h i c p o l i s h i n g e i t h e r w i t h 0.25 ~t d i a m JOHN E. LYTTLE, formerly Graduate Student, Department of Physical and Engineering Metallurgy, Polytechnic Institute of Brooklyn, Brooklyn, N. Y., is Supervisor, Howmet Corp., Microcast Division, Dover, N.J. P E T E R V. DEMBOWSKI, formerly Graduate Student, Department of Physical and Engineering Metallurgy, PolytechnicInstitute of Brooklyn, is 1st Lieutenant, U. S. Army, Watervliet Arsenal, Watervliet, N. Y. LOUIS S. CASTLEMAN is Professor, Department of Physical and EngineeringMetallurgy, PolytechnicInstitute of Brooklyn. Manuscript submitted July 7 , 1970. Mt-TALt.UR(;I('AI.
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d i a m o n d dust o r w i t h 0.05 ~t d i a m A1203 p o w d e r ; 3) e l e c t r o p o l i s h i n g . W e a l s o c l e a n e d the s u r f a c e s of a f e w aluminum and a n t i m o n y specimens immediately p r i o r t o b o n d i n g by s p u t t e r i n g t h e m i n a g l o w d i s c h a r g e a p p a r a t u s . I n m o s t c a s e s , we c l a m p e d the d i f f u s i o n c o u p l e h a l v e s t o g e t h e r in jigs at r o o m t e m p e r a t u r e , i n s e r t e d t h e m in f u r n a c e s c o n t a i n i n g a n i n e r t a t m o s p h e r e of a r g o n , a n d h e a t e d the f u r n a c e s t o t h e d i f f u s i o n a n n e a l t e m p e r a t u r e . In o t h e r c a s e s , we i n s e r t e d the d i f f u s i o n c o u p l e h a l v e s into a " h o t - p r e s s i n g " j i g w i t h the p r e p a r e d s u r f a c e s in a p p o s i t i o n but not in c o n t a c t ; we p l a c e d the j i g into a f u r n a c e a l r e a d y s t a b i l i z e d a t the diffusion anneal temperature and p r e s s e d t h e s u r f a c e s t o g e t h e r u n d e r a p r e s s u r e o f 60 t o 80 p s i , the s u r f a c e s c o n s t a n t l y b e i n g e x p o s e d to a n i n e r t a r g o n a t m o s p h e r e . F i n a l l y , we m a d e s e v e r a l d i f f u s i o n c o u p l e s in w h i c h s i n g l e c r y s t a l d i s c s of a l u m i n u m a n d of a n t i m o n y w e r e a s s e m b l e d t o g e t h e r in a j i g . T h e a n t i m o n y d i s c s h a d b e e n cut f r o m a r o d w i t h a n acid s a w to e l i m i n a t e m i c r o c r a c k i n g , 2 a n d the s u r f a c e s of the a l u m i n u m mad of the a n t i m o n y w e r e e l e c t r o p o l i s h e
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