The Crystallization Kinetics of Glassy Fe_<40> Ni_<40> P_<20>
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The crystallization kinetics of glassy Fe_<40>Ni_<40>P_<20> have been determined by transmission electron microscopy and electrical resistivity measurements. The glassy alloy crystallizes isochronally by two stages at heating rate of. 5K/min. First, amorphous phase transformer to (Fe, Ni) austenite and (Fe, Ni)_3P phases by a eutectic reaction at 623K. Second, the eutectic phases recrystallize into the stable phase structure of the same phases at 873K. The data of isothermal anneals of the first process at the temperatures between 603 and 633K are interpreted by use of the Johnson-Mehl-Avrami equation for the transformation theory. The time dependence in J-M-A equation is constant t^<1.5> between 603 and 618K, but increases to t^<3.2> at 633K. The activation energy for the first process is observed to be 85kcal/mol, which is lower that of Fe_<40>Ni_<40>P_<14>B_6 glass.
- 大阪大学の論文
- 1981-12-00
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