tailieunhanh - Study of crystallization kinetics of (Fe50Ni50)73.5Si13.5B9Nb3Cu1 ribbons prepared by rapid cooling technique

Amorphous alloy ribbons of (Fe50Ni50) were fabricated by rapid cooling technique on single copper wheel. After fabrication, the crystalline structure of the ribbons were examined by X-ray diffraction method. The results show that the samples possess a complete amorphous state. | VNU Journal of Science Mathematics Physics Vol. 39 No. 2 2023 111-116 Original Article Study of Crystallization Kinetics of Fe50Ni50 Ribbons Prepared by Rapid Cooling Technique Nguyen Quang Hoa Do Thi Kim Anh Nguyen Duy Thien Hoang Van Huy Tran Vinh Thang Nguyen Ngoc Dinh Tran Thi Ngoc Anh Luong Thi Minh Thuy Vuong Van Hiep VNU University of Science 334 Nguyen Trai Thanh Xuan Hanoi Vietnam Received 03 March 2023 Revised 13 March 2023 Accepted 13 March 2023 Abstract Amorphous alloy ribbons of Fe50Ni50 were fabricated by rapid cooling technique on single copper wheel. After fabrication the crystalline structure of the ribbons were examined by X-ray diffraction method. The results show that the samples possess a complete amorphous state. The crystallization process was studied by using a differential thermal analyzer DSC . The DSC analysis show that there are two exothermic peaks corresponding to two crystalline phases appeared in the alloy ribbons. By changing the heating rate . 5 10 15 20 and 25 oC min and by using the Kissinger method The activation energy of crystallization of the crystalline phases determined for one phase was found to be E1 350 kJ mol and for other one E2 375 kJ mol. Based on these results we have chosen the appropriate annealing mode for the alloy ribbons. After annealing the alloy ribbons were achieved nanocrystalline states of FeNi and α-Fe nano-particles with the grain size ranging from 5 to 15 nm and the fraction of crystallization between the crystalline and amorphous phases of 46 67 85 and 96 respectively for the annealing regimes at 500 oC for 20 30 50 and 60 minutes. Keywords Amorphous alloy ribbons α-Fe crystallization activation energy DSC. 1. Introduction Amorphous alloys of a composition of Fe Ni Co -Si-B-Nb-Cu with adjunct portion of nanocrystals are ultralsoft magnetic materials having very small coercive force Hc high permeability μ and are _ Corresponding author. E-mail address .

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