Criterion for peritectic and eutectic reactions in ternary systems
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1. W. W. Liang,Y. A. Changand S. Lau: ActaMet., 1973, vol. 21, pp. 629-35. 2. I. Gyuk, W. W. Liang and Y. A. Chang:Acta Met., 1973, vol. 21, pp. 635-7. 3. R. P. Anantatmula and D. B. Masson:Met. Trans., 1974, vol. 5, pp. 605-13. 4. Y. A. Chang,L Gyuk and J. Franks: Acta Met., 1971, Vol. 19, pp. 939-53. 5. I. Gyuk and Y. A. Chang: ScriptaMet., 1972,vol. 6, pp. 267-76. 6. Y. A. Chang, G. Henningand D. Naujock: AetaMet., 1974, vol. 22, pp. 7-11, and errata in Acta Met., 1974, vol. 22, p. 1319. 7. Y. A. Chang: Treatise on Materials Science and Technology, 1974, vol. 4, pp. 173-259. 8. C. Kittle: Introduction to Solid State Physics, 2rid edition, pp. 333, John Wiley, 1956. 9. L. Kaufman and R. Bernstein: Computer Calculation of Phase Diagrams, pp. 37--46,AcademicPress, 1970. 10. T. G. Chart, J. K. Critehley and R. Williams:J. Inst. Metals., 1968, vol. 96, pp. 224. 11. S. Kou and Y. A. Chang: Met. Trans. (this issue). 12. J. L. Straalsund and D. B. Masson: Trans. TMS-AIME., 1968, vol. 242, pp. 190-5. 13. D. B. Masson and S. S. Pradhan: Met. Trans., 1973, vol. 4, pp. 991-995. 14. J. Schramm:Z. Metallk., 1938, vol. 30, pp. 131-5.
Criterion for Peritectic and Eutectic Reactions in Ternary Systems
A
/ j:
I: Area = -ve, A m B = +
~
a ~k
/ . . . ~
(EUTECTIC)
/'~'~I
20
[
I
I
I
I
ve
(PERITECTIC) IT:Z~ma=+ve,AmB=+ve krrl:Ama=+ve, AmB=-ve
--
AC~cCi,
X
I
I
i
(PERITECTIC)
I
-
I
\
B
~, C
Fig. 1--The isothermal section of the ternary phase diagram showing the peritectic and eutectic regions in the three-phase triangle.
R A G H A B A P. SAHU In a t e r n a r y s y s t e m t h e r e a c t i o n b e t w e e n one l i q u i d p h a s e and two s o l i d p h a s e s c a n b e w r i t t e n I L1 + a l + ~i ~ L2 + ~2 + ~2. T h e r e a c t i o n is d e f i n e d a s e u t e c t i c , ff on c o o l i n g t h e a m o u n t s of s o l i d p h a s e s a and b o t h i n c r e a s e and t h e a m o u n t of l i q u i d p h a s e L de = c r e a s e s . If t h e a m o u n t of one of t h e s o l i d p h a s e s ( e i t h e r ~ o r fl) d e c r e a s e s on c o o l i n g , t h e n the r e a c t i o n is d e f i n e d a s p e r i t e c t i c . The a m o u n t s c a n b e m e a s u r e d e i t h e r b y w e i g h t o r b y the n u m b e r of m o l e s . S c h r a m m and L u c k e r t 2 h a v e i n v e s t i g a t e d t h e g e n e r a l p r o b l e m of p h a s e c h a n g e s due to c h a n g e in t e m p e r a t u r e in a t e r n a r y s y s t e m . H o w e v e r , t h e i r m e t h o d is c o m p l i c a t e d ff one is o n l y i n t e r e s t e d in f i n d i n g out the n a t u r e of t h e t h r e e p h a s e r e a c t i o n . H i l l e r t ~ h a s p o i n t e d out t h a t t h e c r i t e r i o n u s e d b y M a s i n g and R i c c i in t h e i r textbooks are not always correct for distinguishing bet w e e n e u t e c t i c and p e r i t e c t i c r e a c t i o n s . C o r r e c t g r a p h i c a l c r i t e r i a h a v e b e e n g i v e n b y H i l l e r t ~'3 f o r f i n d i n g out t h e n a t u r e of t h e t
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