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This study was carried out to investigate the physical properties of Fe-Ni, Co-Ni, Co-Mo and Co-W alloys in the liquid state.Density measurements were made by the maximum bubble pressure method at temperatures between the melting points the molar volume of Co-Mo and Co-W alloys increased with increasing concentrations of Mo and W. On the basis of the coefficients of volume expansion of the alloys and electric resistance, the structures of Fe-Ni and Co-Ni alloys in the liquid state were discussed.

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