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Volume effects and associations in liquid alloys

Srikanth, S and Jacob, KT (1988) Volume effects and associations in liquid alloys. In: Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science, 19 (3). pp. 465-470.

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The regular associated solution model for binary systems has been modified by incorporating the size of the complex as an explicit variable. The thermodynamic properties of the liquid alloy and the interactions between theA ?B type of complex and the unassociated atoms in anA-B binary have been evaluated as a function of relative size of the complex using the activity coefficients at infinite dilution and activity data at one other composition in the binary. The computational procedure adopted for determining the concentration of clusters and interaction energies in the associated liquid is similar to that proposed by Lele and Rao. The analysis has been applied to the thermodynamic mixing functions of liquid Al-Ca alloys believed to contain Al2Ca associates. It is found that the size of the cluster significantly affects the interaction energies between the complex and the unassociated atoms, while the equilibrium constant and enthalpy change for the association reaction exhibit only minor variation, when the equations are fitted to experimental data. The interaction energy between unassociated free atoms remains virtually unaltered as the size of the complex is varied between extreme values. Accurate data on free energy, enthalpy, and volume of mixing at the same temperature on alloy systems with compound forming tendency would permit a rigorous test of the proposed model.

Item Type: Journal Article
Publication: Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science
Publisher: Minerals Metals Materials Soc
Additional Information: Copyright of this article belongs to Minerals Metals Materials Soc.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 13 Oct 2010 09:25
Last Modified: 13 Oct 2010 09:25
URI: http://eprints.iisc.ac.in/id/eprint/33074

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