Finemet型非晶合金的复杂晶化动力学行为

doi:10.11896/cldb.22100118

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Abstract The Finemet-type multi-component alloy is one of the most commonly used nanocrystalline soft magnetic materials. In-depth understanding of its crystallization mechanism is essential for better modification of the preparation process, which is of great importance for obtaining target nanocrystalline alloys with stable and excellent soft magnetic properties. Therefore, the non-isothermal crystallization behavior of Fe₇₄Si_14.5B_7.5Nb₃Cu₁(at%) amorphous system was studied by differential scanning calorimeter (DSC) under different heating rates in this study. Firstly, the activation energy E_α for the crystallization process of Fe₇₄Si_14.5B_7.5Nb₃Cu₁ amorphous system was obtained by the typical iso-conversional methods of Kissinger-Akahira-Sinose(KAS), Flyn-Wall-Ozawa(FWO), Starik and Boswell. After that, the preexponential factor A was derived by the compensation effect method, which led to the numerical reconstruction of the reaction model f(α) and the Avrami index n(α). The results showed that the crystallization of Fe₇₄Si_14.5B_7.5Nb₃Cu₁ amorphous alloy was only relatively consistent with the reaction mechanism model of dimensional diffusion, but did not fully close to any present theoretical models, indicating that the crystallization process was a complex reaction involving multiple reaction models. The nucleation rate of crystals rapidly reached a decreasing stage (n(α)=2.3) from the increasing stage at the beginning of crystallization(α＜0.2) and slowly decreased to 0(n(α)=1.5) at 0.2＜α＜0.5. Finally, the crystals continued to grow on the basis of existing grains (n(α)＜1.5) at the end of crystallization(α＞0.5), which was manifested as the three-dimensional growth with a conti-nuously decreasing nucleation rate during the entire crystallization process. The crystallization of Fe₇₄Si_14.5B_7.5Nb₃Cu₁ amorphous alloy was a complex process dominated by three-dimensional diffusion, which was jointly controlled by multiple crystallization mechanisms and coordinated by multiple reaction models.

Key words： Finemet-type alloy crystallization behavior iso-conversional method reaction model nucleation rate crystallization mechanism

Published: 10 February 2024 Online: 2024-02-19

CLC number:

TG139

Fund:Key Research and Development Project of Shandong Province in China (2022CXGC020308).

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	Articles by authors
	WANG Pu
	ZHU Zhengqu
	DONG Yannan
	YANG Dong
	PANG Jing
	ZHANG Jiaquan

Cite this article:

WANG Pu,ZHU Zhengqu,DONG Yannan, et al. Complex Crystallization Kinetics Behavior of Finemet-type Amorphous Alloy[J]. Materials Reports, 2024, 38(3): 22100118-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22100118 OR http://www.mater-rep.com/EN/Y2024/V38/I3/22100118

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