| The effect of transition metals on the glass forming ability, GFA, has been investigated in Fe_(75-x)Si_(10)B_(15) Mx(M=Cr, Mn, Co, Ni, Ti, Zr, Nb, Ta, x=2.5, 5.0at%) alloy wires. The effect of transition metals on the critical diameter of an amorphous wire was different according to the group of the periodic table. The amorphous wire with the largest critical diameter of 270 ㎛ was obtained in the Fe_(72. 5)Si_(10)B_(15)Ta(2 5) alloy. Although the GFA increased with atomic size difference and decreased with average outer electron concentration of transition metals, considerable scattering of data was shown in these relations. The GFA increased in good accordance with the boride and the silicide formation enthalpy of transition metals up to a certain level of the enthalpy, then rapidly decreased over that enthalpy level. It is thought that the enthalpies of formation of the transition metal boride and the silicide are more effective factors than the atomic size difference or the average outer electron concentration to explain the effect of the transition metals on the CFA in the Fe-Si-B alloys. |
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