| The effect of metalloids on the crystallization temperature(T_x) and the melting point(T_m) has been investigated in Fe_(100)-○Si_xB_y, (2.5≤20, 2.5≤25, 10≤x+y≤35) alloy wires. The atomic size difference and heat of mixing of the alloys increased with increasing metalloid content. Conversely, the electron concentration decreased with the content. T_x of the Fe-Si-B amorphous alloy wires increased with the increasing values of the underlined three factors up to a maximum at a certain value of each factor. Then, the T_x decreased with those factors after the maximum. It is assumed that the change of T_x results from the variation of the relative stability of an amorphous phase with the heat of mixing which depends on the atomic size and electron concentration in alloys. The stability relies upon the elastic energy in a solid solution and the structural stability. The latter comes from the electron concentration effect, the former the atomic size difference. In contrast to T_x, T_m initially decreased with the three factors, then increased with them after showing a minimum although the relation showed much more divergence than that of T_x. Since the maximum of T_x and the minimum of T_m occur at the nearly same values of heat of mixing, T_x/T_m(glass forming ability) has a maximum in the vicinity of these heat of mixing values. |
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