Fe33Ni50P17非晶質合金の2段エンタルピー緩和とキュリー温度の変化

盧 泰奐, 井上 明久, 藤森 啓安, 増本 健

doi:10.2320/jinstmet1952.54.3_255

The changes in reversible enthalpy relaxation (ΔH_endo) and Curie temperature (ΔT_c) upon annealing were examined calorimetrically for an amorphous Fe₃₃Ni₅₀P₁₇ alloy, with the aim of clarifying further the mechanism of the two-stage relaxation proposed recently for amorphous alloys. The annealed Fe-Ni-P alloy exhibited a typical two-stage enthalpy relaxation behavior. That is, a clearly distinctive two-stage splitting with maxima at about T_g-200 K and T_g was observed in the change of ΔH_endo with annealing temperature. The activation energy for relaxation increases from 0.19 to 0.30 aJ for the first-stage relaxation at the lower temperature to 0.35 to 0.51 aJ for the second-stage relaxation, accompanied by a rapid increase of the frequency term. The ΔH_endo increases almost linearly with ΔT_c at the first-stage while no appreciable correspondence is observed at the second stage, indicating the existence of a similar mechanism for the changes of ΔH_endo and T_c in the first-stage relaxation. From these results, it was interpreted that the first-stage enthalpy relaxation and the change in Curie temperature are due to the development of the chemical short-range ordering resulting from rearrangements of Fe-Ni pairs with weak bonding nature and the second-stage relaxation due to the topological change resulting from the cooperative rearrangement of metal-metalloid pairs with strong bonding nature.

Fe<SUB>33</SUB>Ni<SUB>50</SUB>P<SUB>17</SUB>非晶質合金の2段エンタルピー緩和とキュリー温度の変化

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