Anomalous elastic properties of a precipitation-hardened copper alloy
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extruding the titanium aluminides; to Mr. T. F. Orcutt, Mr. J. V. Smith, Sgt. R. Arnett, and Mr. E. Wysong f o r t e c h n i c a l a s s i s t a n c e ; and to Mr. M. M. Allan of P r a t t and Whitney, F l o r i d a f o r supplying m a t e r i a l s . I a l s o w i s h to thank Dr. H. A. L ip s it t of the A i r F o r c e M a t e r i a l s L a b o r a t o r y f o r his c r i t i c a l r e a d i n g of the m a n u script. 1. H. A. Lipsitt, D. Shechtman,and R. Schahik: Met. Trans. A, 1975,vol.6A, pp. 1191-96. 2. W. E. Tefft:Res. Nat. Bur. Stand., 1960,vol. 64B, no. 4, pp. 237-42. 3. W. H. Hill,K. D. Shimmin,and B. A. Wilcox:ASTMProc., 1961.vol. 61, pp. 890-906. 4. S. Spinner and W. E. Tefft: ASTMProc., 1961,vol. 61, pp. 1221-38. 5. A. T. Berztiss:SIAMRev., 1964, vol.6, Issue 3, pp. 203-27. 6. R. E. Schafrikand H. A. Lipsitt: Unpublishedresearch, Air ForceMaterialsLaboratory, Wright-Patterson AFB,Ohio, 1975. 7. D. L. Ruckle,M. J. Blackburn, and S. Z. Hayden: Unpublishedresearchperformedunder GovernmentContract F33615-75-C-1167, 1975, Materials Engineeringand Research Laboratory,Pratt & WhitneyAircraft,East Hartford, Conn. 8. N. S. Stoloffand R. G. Davies:Progr.Mater. Sci., 1966,vol. 13, no. 1, p. 10. 9. F. Garofalo,P. R. Malenack,add G. V. Smith: ASTMSpecialPublicationNo. 129, p. 10, 1952. 10. M. R. Spiegel:Statistics, 1961, p. 243, McGraw-HillBookCo., New York, N.Y.
< 0.01 lab, < 0.01 Fe, < 0.01 Ni, < 0.01 Mn, b a l a n c e Cu. M a s s d e n s i t y d e t e r m i n e d by h y d r o s t a t i c weighing is 8.94 g / c m 3. H a r d n e s s is 57.5 on a R o c k w e l l 3 0 - T s c a l e . ASTM g r a i n - s i z e n u m b e r is five. G r a i n s a r e e q u i a x e d and they show s o m e twins. But no e v i d e n c e of p r e c i p i t a t e s w a s s e e n at m a g n i f i c a t i o n s up to 500. T he m a t e r i a l w a s p r o d u c e d by the P h e l p s Dodge C o r p o r a t i o n in the f o r m of a flat e x t r u s i o n 2.5 c m x 10.8 e m in c r o s s - s e c t i o n . E s s e n t i a l l y the s a m e g r a i n g e o m e t r y is o b s e r v e d in s e c t i o n s p a r a l l e l and p e r p e n d i c u l a r to the e x t r u s i o n d i r e c t i o n . The e x t r u s i o n t e m p e r a t u r e w a s 1227 K and the s u b s e q u e n t aging t e m p e r a t u r e w a s 866 K f o r 1 h. Th e c o m m e r c i a l d e s i g n a t i o n of this m a t e r i a l is a l l o y PD 135. (This t r a d e name is used h e r e to identify the m a t e r i a l ; it is not an NBS e n d o r s e m e n t of a p a r t i c u l a r p r o d u c t . ) The n a t u r e of the p r e c i p i t a t e p h a s e has, a p p a r e n t l y , not b e e n studied, The e l a s t i c c o n s t a n t s w e r e d e t e r m i n e d by m e a s u r i n g t h e u l t r a s o n i c l o n g i t u d i n a l - w a v e and s h e a r - w a v e v e l o c ities, v l and v t using a M c S k i m i n s p u l se method at a f r e q u e n c y n e a r 10 MHz. The u su al e n g i n e e r i n g e l a s t i c c o n s t a n t s a r e r e l a t e d to t h e s e v e l o c
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