The mechanical behavior of 6063 aluminum
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10 4
298 ~ K
10 3
I~
90
I
I
I
I
I
I
I
I
I
I
I
2
5
Io- 4
2
5
Io- 3
2
5
io- z
2
5
Io -I
H = Ho + K H I - 1/2
a n d t h e v a l u e s of Ho a n d K H t h u s o b t a i n e d a r e i n reasonable agreement with limited tensile data which are available for comparison. This research was performed at the Lawrence Rad i a t i o n L a b o r a t o r y u n d e r t h e a u s p i c e s of t h e U n i t e d States Atomic Energy Commission and at the Univers i t y of M a r y l a n d u n d e r t h e a u s p i c e s of t h e A d v a n c e d R e s e a r c h P r o j e c t s A g e n c y of t h e U n i t e d S t a t e s D e p a r t m e n t of D e f e n s e . 1. G. E. Zlma and J. F. Lakner: Intern. J. Powder Met., 1968, vol. 4, p. 19. 2 E. O. Hall Nature, 1954, vol. 173, p. 948. 3. P. C. Jindal and R. W. Armstrong. Trans. TMS-AIME, 1969, vol 245, p. 623. 4. E. O. Hall: Proc. Phys Soc. London, 1951, vol. B64, p. 747; N. J. Petch: J. Iron Steellnst., 1953, vol. 174, p. 25. 5. R. W. Armstrong, I. Codd, R. M. Douthwaite, and N. J. Petch: Phil. Mag., 1962, vol. 7, p. 45. 6. R. D. Buchheit, C. H. Brady, and G. A. Wheeler: DMICMemorandum 37, Defense MetalsInformation Center, Battelle MemorialInst., 1959. 7. G. D. Rieck: Tungsten andlts Compounds, p. 30, Pergamon,Oxford, 1967. 8. H. Buckle Met. Rev., 1959, vol. 4, p. 49; B. C. Allen, D. J. Maykuth, and R. I. Jaffee"J. Inst. Metals, 1961, vol. 90, p. 120. 9. J. W. Aldrich: M Sc. thesis, Brown University, 1968. 10. R. M. Douthwaite: J. Iron Steel Inst., 1969, in press. 11. E. S. Meleranand D. A. Thomas: Trans. TMS-AIME, 1965, vol. 233, p. 937.
(sec-~)
Fig. 1--0.2 pet flow s t r e s s v s s t r a i n r a t e for a l u m i n u m 6063-0 at 298 ~ 620 ~ 720 ~ 820 ~ and 870~ r a t e s e n s i t i v i t y of f l o w s t r e s s in 6 0 6 3 - 0 a l u m i n u m in t h e t e m p e r a t u r e r a n g e 298 ~ to 870~ T e s t s p e c i m e n s c o n f o r m i n g to A S T M - 8 5 7 T w e r e m a c h i n e d f r o m c o m m e r c i a l g r a d e b a r s of 6063 T 5 a l u m i n u m . T h e s p e c i m e n s w e r e a n n e a l e d a t 415 ~ • 10~ f o r 2.5 h r , c o o l e d to 260~ i n 3 h r , t h e n a i r c o o l e d to room temperature. T h i s t r e a t m e n t i s t h e one c o m m o n l y used to produce the "0" condition in this alloy. Load-time curves at constant crosshead speeds were obtained at various temperatures using an Instron testing machine. Speeds were varied from 0.002 to 2.0 i p m g i v i n g a s t r a i n r a t e r a n g e of 2.2 x 10 -5 to 2.2 • 10 - z s e c -1. A t h r e e z o n e r e s i s t a n c e t u b e f u r n a c e was used for the elevated temperature tests. Each t e n s i l e b a r w a s h e l d a t a t e m p e r a t u r e f o r 20 m i n p r i o r to t e s t i n g a n d t h e m a x i m u m t e m p e r a t u r e v a r i a t i o n a l o n g t h e g a g e l e n g t h w a s k e p t b e l o w 2~ A t l e a s t two t e s t s w e r e r u n f o r e a c h c o n d i t i o n of s t r a i n r a t e a n d temperature. F i g . 1 s h o w s t h e 0.2 p c t o f f s e
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