REVERSIBLE STRUCTURAL RELAXATION OF AMORPHOUS NI70TM5SI10B15 (TM = V, CR, MN, FE, CO, NI) ALLOYS

The structural relaxation of amorphous Ni70TM5Si10B15 (TM = V, Cr, Mn, Fe, Co, Ni) alloy was investigated by the electrical resistance measurement under isochronal annealing. The reference Ni75Si10B15 alloy showed no reversible changes in electrical resistance. All alloys other than TM = Ni exhibited a reversible change which is peculiar to the chemical short-range ordering. Only in TM = Cr alloy was the reversible part predominantly observed after pre-annealing, and in other alloys the irreversible change was also seen. The degree of reversible change below 623 K was in the order Fe > V > Cr > Co > Mn. This origin is discussed on the basis of Ni TM correlation, which is considered to play an important role in ordering, and TM--metalloid correlation, which is considered to hinder the formation of an ordered phase.