Volume Effects and Associations in Liquid Alloys

Srikanth, S and Jacob, K T (1988) Volume Effects and Associations in Liquid Alloys. Metallurgical and Materials Transaction B, 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 dilu-tion and activity data at one other composition in the binary. The computational procedure adopted for deter-mining the concentration of clusters and interaction ener-gies 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 inter-action 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:Article
Official URL/DOI:http://www.springerlink.com/content/qkgx547651x061...
Uncontrolled Keywords:Binary systems; thermodynamic; liquid alloy
Divisions:Director Office
ID Code:3981
Deposited By:Sahu A K
Deposited On:23 Sep 2011 10:26
Last Modified:30 Nov 2011 10:01
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