Wrought aluminum-nickel alloys for high strength-high conductivity applications
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r e c e n t y e a r s t h e r e h a s b e e n a r a p i d i n c r e a s e in the use of a l u m i n u m a l l o y s a s s t r a n d e d c o n d u c t o r s f o r t r a n s m i s s i o n and d i s t r i b u t i o n of e l e c t r i c a l e n e r g y , p a r t l y b e c a u s e of the i n c r e a s i n g s h o r t a g e of c o p p e r and p a r t l y b e c a u s e of the r a p i d l y e x p a n d i n g e n e r g y m a r k e t . A l u m i n u m of c o n t r o l l e d p u r i t y (EC G r a d e ) h a s a m i n i m u m c o n d u c t i v i t y of about 61.0 p c t IACS and is n e x t only to s i l v e r (108 pct) and c o p p e r (100 pct). EC g r a d e a l u m i n u m h a s only m o d e r a t e m e c h a n i c a l s t r e n g t h even in h a r d d r a w n condition, n e c e s s i t a t i n g a c l o s e s p a c i n g of p o l e s and p y l o n s to l i m i t the c a t e n a r y s e l f s u p p o r t . EC g r a d e a l u m i n u m h a s a m i n i m u m of 99.45 p c t a l u m i n u m with c o n t r o l l e d i m p u r i t i e s (Table II). To i m p a r t m e c h a n i c a l s t r e n g t h to a l u m i n u m c o n d u c t o r s , w i r e s can be s t r a n d e d on a s t e e l c o r e w i r e (ACSR) o r a l l o y i n g can be r e s o r t e d to. While the f o r m e r r e d u c e s the c o n d u c t i v i t y f o r the t o t a l v o l u m e , the l a t t e r r e d u c e s c o n d u c t i v i t y b e c a u s e of a l l o y i n g . L e n y r e and Roche 1 have d e v e l o p e d an a l u m i n u m m a g n e s i u m - s i l i c o n a l l o y for c o n d u c t o r a p p l i c a t i o n , 6201-T81, to r e p l a c e ACSR f o r high v o l t a g e t r a n s m i s sion. This h a s b e t t e r t e n s i l e s t r e n g t h at 1 p e t e l o n g a tion than ACSR and the e l e c t r i c a l c o n d u c t i v i t y is e q u i v a l e n t to o r b e t t e r than that of ACSR. Dean 2 h a s r e p o r t e d an i n c r e a s e in the s t r e n g t h of a l u m i n u m b y a d d i t i o n of up to 2 p c t Ni. K u m a r 3 h a s p r o p o s e d a new p o w e r t r a n s mission conductor alloy, PM-2, developed by making a b i n a r y s o l u t e a d d i t i o n of a n u m b e r of e l e m e n t s to a l u m i n u m . This a l l o y is r e p o r t e d to p o s s e s s i m p r o v e d e l e c t r i c a l c o n d u c t i v i t y (61.5 p c t IACS) and h i g h e r s t r e n g t h (184 N / m m 2) a s c o m p a r e d to c o n v e n t i o n a l a l u m i n u m c o n d u c t o r s . N i c k e l is r e p o r t e d 3 to be i n n o c P. K. ROHATGI and K. V. PRABHAKAR are with Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India. Manuscript submitted May 24, 1974. METALLURGICAL TRANSACTIONS A
uous on the e l e c t r i c a l c o n d u c t i v i t y of a l u m i n u m and h e n c e an a t t e m p t w a s m a d e in t h i s i n v e s t i g a t i o n to s t u d y the p o s s i b i l i t y of d e v e l o p i n g high s t r e n g t h A l - N i a l l o y s f o r p o s s i b l e c o n d u c t o r a p p l i c a t i o n s . The
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