An electron microscopic and diffraction study of Cu-9 wt pct Al alloy
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p r e s e n c e of the s m a l l d o m a i n s s u p e r l a t t i c e (LRO) and k . ) R D E R - s t r e n g t h e n i n g is b e l i e v e d to be one of the m a its s t r u c t u r e , e x p e r i m e n t s b a s e d on t r a n s m i s s i o n e l e c j o r f a c t o r s of solid solution s t r e n g t h e n i n g and other r e t r o n m i c r o s c o p y and s e l e c t e d a r e a d i f f r a c t i o n method lated p h e n o m e n a s which o c c u r in the d e f o r m a t i o n b e w e r e d e s i g n e d for the 9 wt pct Al alloy, s u b j e c t e d to h a v i o r of a l l o y s . ~-4 the above o r d e r i n g t r e a t m e n t in the d e f o r m e d and n o n The i d e n t i f i c a t i o n of o r d e r is cited in the l i t e r a t u r e for C u - A l a l l o y s . F o r i n s t a n c e C l a r e n b r o u g h e t a l ~ i d e n - d e f o r m e d condition. tified the p r e s e n c e of SRO in this s y s t e m by m e a n s of c a l o r i m e t r y and r e s i s t i v i t y m e a s u r e m e n t s , s u g g e s t i n g MATERIAL AND E X P E R I M E N T A L the role of the v a c a n c i e s and d e f o r m a t i o n in the k i n e t i c s METHOD of o r d e r i n g . More r e c e n t l y Scattergood and Bever 6 i n v e s t i g a t e d the r o l e of o r d e r i n g on the d e f o r m a t i o n f e a The c o p p e r - a l u m i n u m alloys were c h e m i c a l l y a n a t u r e s of the C u - A l s y s t e m q u a n t i t a t i v e l y , e x a m i n i n g the lyzed, c o n t a i n i n g 9 wt pct (19 at. pct) a l u m i n u m . The changes i n its d e g r e e as a r e s u l t of heat t r e a t m e n t , u s alloys w e r e p r e p a r e d in a B a l z e r s VSG-10 v a c u u m i n ing X - r a y diffuse s c a t t e r i n g and also r e s i s t i v i t y m e a duction f u r n a c e f r o m e l e c t r o l y t i c copper (99.97 wt pct) s u r e m e n t s . R e s e a r c h work in this d i r e c t i o n was also and a l u m i n u m wire (99.97 wt pct) in a g r a p h i t e c r u c i b l e . p e r f o r m e d b y Kinoshita e t a l ~ in a 15.5 at. pct Al alloy. The ingots were s u b s e q u e n t l y hot forged at 650~ to a P e r h a p s one of the m o s t s y s t e m a t i c works on the effect t h i c k n e s s of 25 m m , pickled to r e m o v e oxide f r o m the of heat t r e a t m e n t , and alloying content, in r e g a r d of the s u r f a c e and a n n e a l e d in a v a c u u m f u r n a c e at 850~ for r o l e of o r d e r i n g in the e n h a n c e d m e c h a n i c a l p r o p e r t i e s 36 h to achieve c o m p l e t e h o m o g e n e i t y , followed b y c o o l of o r d e r - s t r e n g t h e n e d Cu-A1 alloys is that of P o p p l e ing in the f u r n a c e to r o o m t e m p e r a t u r e . The alloy was well and C r a n e . 8 They found that the higher i n c r e a s e then cold r o l l e d to 15 m m t h i c k n e s s , a n n e a l e d at 630~ in the m e c h a n i c a l p r o p e r t y data (U.T.S. and 0.2 pct offfor 1 h and water quenched p r i o r final cold r o l l i n g to set Y.S.) is obtained with a c o
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