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A geometric model for calculating the viscosity of multi-component melt from related binary physicochemistry properties was derived based on Chou’s thermodynamic geometric model. The model derived was employed to predict the viscosity of Au-Ag-Cu alloys. The results show that the calculated viscosity for Au-Ag-Cu alloys meet the experimental data very well. In addition, the viscosity of Bi-Sn-In systems was also predicted with this model.