Metastable phase equilibria

It is instructive to consider the free-energy hierarchy and the metastable phase equilibria when crystallization of an amorphous material is discussed. Koster and Herold [56] discussed these aspects of crystallization and showed that crystallization reactions of amorphous alloys can be classified into the following three types polymorphic, primary and eutectic crystallization reactions. Among these three types, the slowest crystal growth process is expected for primary crystallization and thus, primary crystallization is ideal for tailoring fine microstructures upon decomposition of amorphous alloys. 

J.C. Viala, P. Fortier, and J. Bouix, Stable and Metastable phase equilibria in the chemical interaction between aluminum and silicon carbide. J. Mater. Sci. 22, 1842-1850 (1990). 

Thermodynamics of Metastable Phase Equilibria and Metastable Phase Diagrams... 

Wanl] compiled a fliermodynamic database of the Cu-Fe-X (X Al, Co, Cr, Mn, Mo, Ni, Nb, V) systems by the CALPHAD method. According to [2004Wanl], on the basis of this database much information concerning stable and metastable phase equilibria, isothermal and vertical sections, molar fractions of constituent phases, liquidus surface projection, etc., could be predicted. 

Koc] Kocherzhinskiy, Yu.A., Kulik, O.G., Dragunov, V.V., Demyanchuk, A.V., Melting Diagram of the Fe-Mn-C System (in Russian), Stable and Metastable Phase Equilibria in Metallic Systems, Nauka, Moscow, 124-128 (1985) (Experimental, Phase Diagram, Review, 15)... 

Regarding the metastable phase equilibria, two ternary reactions have been measured [1967Mal, 1974Mal] an E-type and a U-type. The compositions of the phases and the reaction temperatures have been indicated in Table 4 as taken from [1974Mal]. 

Stable and Metastable Phase Equilibria in the Salt-Water Systems... 

It is essential to study the stable and metastable phase equilibria in multi-component systems at different temperatures for its application in the fields of chemical, chemical engineering such as dissolution, crystallization, distillation, extraction and separation. 

The metastable phase equilibria of salt-water systems... 

Apparatus for the metastable phase equilibria in the salt-water system... 

In this example of the metastable phase equilibria system (NaCl - KCl - Na2B407 - K2B4O7 -H2O) at 308.15 K, the isothermal evaporation box was used. In an air-conditioned laboratory, a thermal insulation material box (70 cm long, 65 cm wide, 60 cm high) with an apparatus to... 

The isothermal evaporation method was used in metastable phase equilibria study. According to phase equilibrium composition, the appropriate quantity of salts and DDW calculated were mixed together as a series of artificial synthesized brines and loaded into clean polyethylene containers (15 cm in diameter, 6 cm high), then the containers were put into the box for the isothermal evaporation at (308.15 0.2) K. The experimental conditions with air flowing velocity of 3.5-4.0 m/s, relative humidity of 20-30%, and evaporation rate of 4-6 mm/d are presented, just like the climate of the Qaidam Basin. For... 

Deng, T.L. Meng, L.Z. Sim, B. (2008d). Metastable phase equilibria of the reciprocal quaternary system containing sodium, potassium, chloride and borate ions at 308.15 K, J. Chem. Eng. Data, Vol. 53, No. 3, pp. 704-709, ISSN 0021-9568... 

H. J. Fecht, M.X. Zhang, Y.A. Chang and J.H. Perepezko, Metastable phase equilibria in the Lead-Tin alloy system. Part II thermodynamic modelling Metall. Trans. A, 20(1989), 795-803... 

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