CRYSTALLIZATION PROCESS AND NON–ISOTHERMAL CRYSTALLIZATION KINETICS OF MELT–SPUN Nd–Fe–B AMORPHOUS THICK RIBBONS

Acta Metall Sin

2009, Vol. 45

Issue (2): 237-242 DOI:

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CRYSTALLIZATION PROCESS AND NON–ISOTHERMAL CRYSTALLIZATION KINETICS OF MELT–SPUN Nd–Fe–B AMORPHOUS THICK RIBBONS

WANG Dapeng; BAO Xiaoqian; ZHANG Maocai; ZHU Jie

State Key Laboratory of Advanced Metals and Materials; University of Science and Technology Beijing; Beijing 100083

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WANG Dapeng; BAO Xiaoqian; ZHANG Maocai; ZHU Jie. CRYSTALLIZATION PROCESS AND NON–ISOTHERMAL CRYSTALLIZATION KINETICS OF MELT–SPUN Nd–Fe–B AMORPHOUS THICK RIBBONS. Acta Metall Sin, 2009, 45(2): 237-242.

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Abstract

Crystallization processes and non–isothermal crystallization kinetics of Nd₆Fe₇₂B₂₂and Nd₆Fe₆₈Ti₄B₁₇C₅ amorphous thick ribbons rapidly quenched at a roller running rate of 12 m/s were investigated by means of DSC, XRD, Kempen model and Kissinger equation, respectively.
Two thick ribbons show different crystallization processes and kinetic mechanisms. The crystallization processes of Nd₆Fe₇₂B₂₂ and Nd₆Fe₆₈Ti₄B₁₇C₅alloys can be discribed as: amorphous phase (AP)→ Nd₂Fe₂₃B₃→Nd₂Fe₁₄B+ α--Fe +Fe₃B→Nd₂Fe₁₄B+α--Fe+Fe₃B+NdFe₄B₄, and AP→Nd₂(Fe, Ti)₁₄(B, C)+α--Fe + Fe₃B, respectively. Different from polymorphic crystallization controlled by interface for Nd₆Fe₇₂B₂₂ alloy, the crystallization of Nd₆Fe₆₈Ti₄B₁₇C₅ is eutectoidic and the nucleus growth is controlled by diffusion.

Key words: Nd–Fe–B amorphous alloy crystallization kinetics crystallization activationt energy

Received: 10 July 2008

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I2/237

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