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Fig. 1--A typical m o r p h o l o g y of the a s - c l a d bond zone b e t w e e n two c o p p e r s i n g l e c r y s t a l s - { l l 0 } o r i e n t e d , m a g n i f i c a tion 148 t i m e s .

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1. P. de Cesaris: Gazz.Chim. ltal., 1913, vol. 25, pp. 365-79. 2. W. Guertler and A. Bergmann: Z. Metallk., 1933, vol. 25, pp. 53-57.

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A Study of Explosion Clad Bonding by Transmission Electron Microscopy

LINE OF COLLISION

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The i m p o r t a n t f e a t u r e of the e x p l o s i o n - c l a d d i n g p r o c e s s is the f o r m a t i o n of a m e t a l l u r g i c a l bond, an i n t e r f a c e ~-3 o r a bond zone, 4 b e t w e e n the two c l a d m e t a l s . R e l a t i v e l y l i t t l e r e s e a r c h h a s b e e n done to d a t e with a view to c h a r a c t e r i z i n g t h e n a t u r e of t h e bond r e g i o n in any e x p l o s i o n - c l a d m e t a l s y s t e m . 4-8 In p r e v i o u s s t u d i e s %6 the e m p h a s i s was p l a c e d on s p e c i m e n s a n n e a l e d s u b s e q u e n t to c l a d d i n g in o r d e r to o b v i a t e the e x p e r i m e n t a l d i f f i c u l t i e s i n h e r e n t in s t u d y i n g the high p l a s t i c d e f o r m a t i o n of the bond r e gions in the a s - c l a d condition. In o t h e r s t u d i e s , %7 i n v e s t i g a t i o n s of the bond r e g i o n in the C u / C u p o l y c r y s t a l l i n e s y s t e m , in the a s - c l a d condition, did not l e a d to c o n c l u s i v e r e s u l t s a s to the s t r u c t u r e and the n a t u r e of that r e g i o n , i.e. w h e t h e r it is a bond zone 4 o r a p l a n a r interface.7 T h e m a i n p u r p o s e of the p r e s e n t s t u d y h a s been to c h a r a c t e r i z e the bond r e g i o n of e x p l o s i v e l y c l a d C u / C u s i n g l e c r y s t a l s f r o m the m o r p h o l o g i c a l and s t r u c t u r a l point of view, on the b a s i s of o b s e r v a t i o n s by m e a n s of t r a n s m i s s i o n e l e c t r o n m i c r o s c o p e (TEM). T h e s i n g l e c r y s t a l was u s e d a s a tool for c o m i n g to a b a s i c u n d e r s t a n d i n g of the bond n a t u r e , b e c a u s e it is f r e e of the i n t e r a c t i o n of g r a i n b o u n d a r i e s enJ. DOR-RAM is Managing Director, E.M.T. Metals (1975) Ltd., Tel Aviv, Israel, and B. Z. WEISS and Y. KOMEM are Professor and Senior Lecturer, respectively, Department of Materials Engineering, TechniconIsrael Institute of Technology, Haifa, Israel, where J. Dor-Ram was formerly an Instructor. Manuscript submitted June 17, 1976. 518-VOLUME 8A, MARCH 1977

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Fig. 2 - - S c h e m a t i c r e p r e s e n t a t i o n of the typical r a n g e of m o r phologies and s t r u c t u r e s s e e n in the clad zone of C u / C u s i n gle c r y s t a l s .

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