Crystallization kinetics of Al83Y10Ni7(at%) amorphous alloys prepared bymelt spinning was studied by differential scanning calorimetry (DSC). Three or fourstages of transforniation from amorphous to equilibrium state ...Crystallization kinetics of Al83Y10Ni7(at%) amorphous alloys prepared bymelt spinning was studied by differential scanning calorimetry (DSC). Three or fourstages of transforniation from amorphous to equilibrium state can be distinguished atheating rate 1 ￣ 40K / min. Apparent activation energies are calculated according to themethods of Kissinger, Ozawa and Arrhernius equation. An amoaphous phase with highstructural and heat stability was obtained in the vicinity of Al83Y10,Ni7. The isotheimalcrystallization kinetics of the first peak, in the range of 0. 15￣ 0.85, was found to be inagreement with John-Mell-Avrami equation with n = 2.5. Nucleation and growth dur-ing isothennal crystallization of the first stage for Al83Y10Ni7 amorpohous were ap-proached by introducing the concept of local Avrami exponent and local activation en-ergy.展开更多
文摘Crystallization kinetics of Al83Y10Ni7(at%) amorphous alloys prepared bymelt spinning was studied by differential scanning calorimetry (DSC). Three or fourstages of transforniation from amorphous to equilibrium state can be distinguished atheating rate 1 ￣ 40K / min. Apparent activation energies are calculated according to themethods of Kissinger, Ozawa and Arrhernius equation. An amoaphous phase with highstructural and heat stability was obtained in the vicinity of Al83Y10,Ni7. The isotheimalcrystallization kinetics of the first peak, in the range of 0. 15￣ 0.85, was found to be inagreement with John-Mell-Avrami equation with n = 2.5. Nucleation and growth dur-ing isothennal crystallization of the first stage for Al83Y10Ni7 amorpohous were ap-proached by introducing the concept of local Avrami exponent and local activation en-ergy.
