A thermodynamic lattice theory on melting curve and eutectic point of binary alloys. Application to fcc and bcc structure |
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Authors: | Nguyen V Hung Dung T Tran Nguyen C Toan and Barbara Kirchnner |
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Institution: | (1) State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, People' Republic of China;(2) Institute of Metallurgy, TU Clausthal, Robert-Koch Strasse 42, D-38678 Clausthal-Zellerfeld, Germany; |
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Abstract: | A thermodynamic lattice theory has been developed for determination of the melting curves and eutectic points of binary alloys.
Analytical expressions for the melting curves of binary alloys composed of constituent elements with the same structure have
been derived from expressions for the ratio of root mean square fluctuation in atomic positions on the equilibrium lattice
positions and the nearest neighbor distance. This melting curve provides information on Lindemann’s melting temperatures of
binary alloys with respect to any proportion of constituent elements, as well as on their eutectic points. The theory has
been applied to fcc and bcc structure. Numerical results for some binary alloys provide a good correspondence between the
calculated and experimental phase diagrams, where the calculated results for Cu1−x
Ni
x
agree well with the measured ones, and those for the other alloys are found to be in a reasonable agreement with experiment. |
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Keywords: | |
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