THERMODYNAMICAL CRITERION OF SPINODAL DECOMPOSITION IN TERNARY SYSTEM

Acta Metall Sin

1990, Vol. 26

Issue (5): 79-85 DOI:

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THERMODYNAMICAL CRITERION OF SPINODAL DECOMPOSITION IN TERNARY SYSTEM

JIANG Bohong;CHANG Meihua;WEI Qing;XU Zuyao (T.Y. Hsu) Shanghai Jiaotong University

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JIANG Bohong;CHANG Meihua;WEI Qing;XU Zuyao (T.Y. Hsu) Shanghai Jiaotong University. THERMODYNAMICAL CRITERION OF SPINODAL DECOMPOSITION IN TERNARY SYSTEM. Acta Metall Sin, 1990, 26(5): 79-85.

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Abstract By expanding the Gibbs free energy of ternary system into a Taylorseries with respect to the composition, a thermodynamical criterion of spinodal de-composition is conducted as G_(xx)(δ_x)~2 + 2G_(xy)δ_xδ_y + G_(yy)(δy)~2<0, from which, various con-ditions of spinodal decomposition are discussed. When G_(xx)<0, G_(xx)~2-G_(xx)G_(yy)<0, it iscalled as unstable decomposition unrestricted by the direction of composition fluctu-ation; when G_(xx)<0, G_(xy)~2-G_(xx)G_(yy)>0, or G_(xx)>0, G_(xy)~2-G_(xx)G_(yy)>0, as well as G_(xx)=0,are all considered as unstable decomposition restricted by the direction of composi-tion fluctuation δ_x and δ_y. The phenomenon of turning round in composition duringspinodal decomposition is attempted to be explained from above poiat of view. Thecomputer calculated ranges of unstable decomposition according to the criterion ofspinodal decomposition on Cu-Ni-Fe ternary system is consistent with the experi-mental results obtained from literatures.

Key words: spinodal decomposition thermodynamics criterion CuNiFe system

Received: 18 May 1990

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