Abstract: Maximum solid solubility (C_max) of different transition metals in metal solvent can be described by a semi-empirical equation using function Z_f that contains electronegativity difference, atomic diameter and electron concentration. The relation between C_max and these parameters of transition metals in vanadium solvent was studied. It is shown that the relation of C_max and function Z_f can be expressed as lnC_max=Z_f=7.3165-2.7805(ΔX)2-71.278δ²-0.85556n^2/3. The factor of atomic size parameter has the largest effect on the C_max of the V binary alloy; followed by the factor of electronegativity difference; the electrons concentration has the smallest effect among the three bond parameters. Function Z_f is used for predicting the unknown C_max of the transition metals in vanadium solvent. The results are compared with Darken-Gurry theorem, which can be deduced by the obtained function Z_f in this work.

Key words: solid solubility; vanadium alloys; function Z_f; electronegativity difference; atomic size parameters; electron concentration