Strain softening in powder metallurgy zinc
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Investigators
Temperature Range, °K
This work Hawkins and Hultgren (1967) Kim and Cosgarea (1966) Aldred and Pratt (1961) Granovskaia and Lyubimov(1953)
950° t o 1112° 950° t o 1125° 877° t o 975° 880° t o 1050° 1200° t o 1490°
kcal/mole Second-law Third-law 46.8 46.6 47.0 51.9 51.9
46.64 46.63 46.60 46.81 46.84
reproducibility of the calibration p r o c e d u r e s s t a t e d e a r l i e r , i t i s u n l i k e l y that s i g n i f i c a n t e r r o r s c o u l d a r i s e f r o m m e a s u r e m e n t s o f t h e s e two p a r a m e t e r s . In T a b l e If t h e r e s u l t s o f t h e p r e s e n t i n v e s t i g a t i o n are c o m p a r e d with r e s u l t s o f all o t h e r recently reported effusion s t u d i e s . T h e p r e s e n t work g i v e s t h e r m o d y n a m i c q u a n t i t i e s in g o o d a g r e e m e n t w i t h t h o s e r e p o r t e d by H a w k i n s a n d H u l t g r e n 4 a n d K i m a n d C o s g a r e a .3 T h e relatively r e c e n t r e s u l t s of A l d r e d and P r a t tz a n d o f G r a n o v s k a i a a n d L y u b i m o v 1 s h o w s i g n i f i c e n t d i s c r e p a n c i e s ( ~ 1 0 p c t ) b e t w e e n t h e AH~gB v a l u e s c a l c u l a t e d by t h e s e c o n d - l a w a n d t h i r d - l a w m e t h o d s , thus indicating either an appreciable experimental scatter or that the conditions u n d e r w h i c h t h e s e res u l t s w e r e m e a s u r e d did not c o r r e s p o n d t o e q u i l i b r i u m . 1. A. P. Granovskaia andA. P. Lyubimov: Zhur. Fiz. Khim., 1953, vol. 27, pp. 1437-42. 2. A. T. Aldred and J. N. Pratt: Trans. Faraday. Soc., 1961, vol. 57, pp. 611-18. 3. J. H. Kim andA. Cosgarea, Jr.: J. Chem. Phys., 1966, vol. 44, pp. 806-09. 4 . D. T.Hawkins andR. Hultgren: Trans. TMS-AIME, 1967, vol. 239, pp. 104649. 5. R. Hultgren, R. L. Orr, P. D. Anderson, and K. K. Kelley: Selected Values o f Thermodynamic Properties o fMetals and Alloys, p . 206, J. Wiley and Sons, Inc., NewYork, 1963. (Suppl. on leaddated 1965, p . 2). 6. Z. A. Munir and A. W. Searcy: J. Electrochem. Soc., 1964, vol. 111, pp. 117073. 7. W.T. Lee andZ. A. Munir: Z Electrochem. Soc., 1967, vol. 114, pp. 1236-39. 8. M. J. Mitchell andZ. A. Munir: High Temp. Sci., 1970, vol. 2, pp. 265-73. 9. P. Roy andR. Hultgren: Trans. TMS-AIME, 1965, vol. 233, pp. 1811-15. 10. Z. A. Munir andM. J. Mitchell: High Temp. Sci., 1969, vol. 1, pp. 381-87. 11. JANAF Thermochemical Tables, Dow Chemical Company, Midland, Michigan, 1963.
Strain Softening in Powder Metallurgy Zinc GLEN R. EDWARDS, JOHN C. SHYNE, AND OLEG D. S H E R B Y h d e c r e a s e in f l o w s t r e s s w i t h s t r a i n i n g at r o o m t e m p e r a t u r e h a s b e e n o b s e r v e d i n z i n c by s e v e r a l r e s e a r c h e r s . Chadwick 1 o b s e r v e d s t r a i n - s o f t e n i n g in zinc as e a r l y as 1 9 3 3 , a n d m o r e recently , Deighton GLEN R. EDWARDS, JOHN C. SHYNE, and OLEG D. SHERBY are Graduate Research Assistant, Professor of Materials Science and Chairman of the Department, and Professo
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