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| AN EMPIRICAL RELATION BETWEEN THE DISTRIBUTION COEFFICIENT OF IMPURITIES IN BINARY ALLOYS AND THE PHASE DIAGRAM |
| WANG WEI-YUAN Institute of Metallurgy; Academia Sinica |
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Cite this article:
WANG WEI-YUAN Institute of Metallurgy; Academia Sinica. AN EMPIRICAL RELATION BETWEEN THE DISTRIBUTION COEFFICIENT OF IMPURITIES IN BINARY ALLOYS AND THE PHASE DIAGRAM. Acta Metall Sin, 1965, 8(2): 177-186.
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Abstract A linear relation has been obtained between the logarithm of the distribution co-efficient of impurities logK_B and the square root of liquidus composition for componentA x_(A, L)~(1/2). in binary systems of Ge or Si with impurities. This relationship hasbeen found to be also applicable to Au-Bi, Au-Tl, Ag-Bi, Ag-Pb and Ag-Tl systems,where the second element represents the impurity. The distribution coefficients at themelting point (K_B~o) of impurities in Ge or Si obtained by extrapolating to zero concentra-tion are in reasonable agreement with the experimental values. Besides, the values K_B~oof certain impurities in Au, Ag, Cu (from group I), Mg (from group II) and Al (fromgroup III) have been calculated. It is shown that in these systems a simple correlationexists between K_B~o and the maximum molar solid solubility of impurities, just like thatfound earlier by Fischler in the binary systems of Ge or Si.
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Received: 18 February 1965
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