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Crystallization Kinetics of Amorphous Alloys Fe73.5Si13.5-xGexB9Cu1Nb3(x=3, 6) |
Ruwu WANG1,3,**(),Jing LIU1,2,Zhanghua GAN1,Chun ZENG3,Fengquan ZHANG3 |
1. College of Materials Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan 430081 2. State Key Laboratory for Advanced Metals and Materials, Beijing University of Science and Technology, Beijing 100083 3. National Engineering Research Center for Silicon Steel, Wuhan 430080 |
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Cite this article:
Ruwu WANG,Jing LIU,Zhanghua GAN,Chun ZENG,Fengquan ZHANG. Crystallization Kinetics of Amorphous Alloys Fe73.5Si13.5-xGexB9Cu1Nb3(x=3, 6). Chinese Journal of Materials Research, 2014, 28(3): 204-210.
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Abstract Amorphous ribbons Fe73.5Si13.5-xGexB9Cu1Nb3(x=3, 6) were prepared by a normal single copper wheel melt spinning technique in atmosphere, which then were isothermally annealed at 470℃、510℃、550℃ and 590℃ respectively for 1 h in a vacuum furnace. The microstructure and crystallization kinetics of the ribbons were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM) and differential scanning calorimeter (DSC) measurements. While the crystallization activation energies of amorphous ribbons were calculated by using Kissinger, Ozawa and Augis-Bennett models based on differential thermal analysis data. The local Avrami exponent n for primary crystallization was calculated by using Johnson-Mehl-Avrami (JMA) equation. The significant variation of local Avrami exponent n with crystallization volume fraction α demonstrated that the primary crystallization kinetics of amorphous ribbons varied at different stages. In the initial stage, the crystallization mechanism was diffusion controlled bulk crystallization with three dimensional nucleation and grain growth, while the nucleation rate deceased with time. In the following stage, it was surface crystallization with one dimensional nucleation and grain growth, while the nucleation rate was near zero. The average sizes D of α-Fe (Si, Ge) grains for the samples annealed at 510℃、550℃ and 590℃for 1 h in a vacuum furnace were less than 15 nm as confirmed both by XRD and TEM measurements.
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Received: 16 August 2013
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Fund: *Supported by the State Key Lab of Advanced Metals and Materials No.2011-ZD03 and the Hubei Provincial Department of Education No.D20111103. |
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