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Phase field analysis method of ferromagnetic crystal grain evolution under magnetic field

An analysis method, ferromagnetic technology, applied in the field of phase field method, can solve the problem of lack of comprehensive consideration of magnetic energy items

Inactive Publication Date: 2017-11-03
SOUTH CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0004] At present, the phase field method of coupled magnetic fields usually only considers a single magnetic energy item, and lacks comprehensive consideration of the magnetic energy item. Quantitative research on organizational evolution process and its laws

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  • Phase field analysis method of ferromagnetic crystal grain evolution under magnetic field
  • Phase field analysis method of ferromagnetic crystal grain evolution under magnetic field
  • Phase field analysis method of ferromagnetic crystal grain evolution under magnetic field

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Embodiment Construction

[0071] In order to describe the technical solution of the present invention more clearly, the specific implementation of the present invention will be further described below in conjunction with examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0072] The invention provides a phase field analysis method for the evolution of ferromagnetic grains under a magnetic field, which is applied to the Nd-Fe-B alloy system below. Using this method to study the formation of hard magnetic phase T in the process of rapid solidification under magnetic field 1 (Nd 2 Fe 14 B) peritectic reaction (Liquid+γ-Fe(FCC)→T 1 ) to simulate, the specific operation steps of this embodiment are as follows:

[0073] 1. Confirm that the research system is Nd-Fe-B, and the simulation process is peritectic reaction (Liquid+γ-Fe(FCC)→T 1 ), the corresponding thermodynamic data are shown in Table 1, the magnetic data and simulation parameters are sho...

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Abstract

The invention discloses a phase field analysis method of ferromagnetic crystal grain evolution under a magnetic field. According to the method, micromagnetics magnetic-energy calculation formulas are combined to introduce magnetic energy, which is generated by ferromagnetic crystal grains under the action of the external magnetic field, into system free-energy on the basis of a classical phase field model, and a general model used for simulating evolution processes of the ferromagnetic crystal grains under the action of the external magnetic field is constructed. According to the model, influences of each magnetic energy item on ferromagnetic phase single-domain crystal grain evolution under different external magnetic field strength and a comprehensive influence of the total magnetic energy on the same can be studied through introducing the different magnetic energy terms (Zeeman energy, magnetocrystalline anisotropy energy and demagnetization field energy). The invention provides the phase field model of considering ferromagnetic crystal grain evolution under the action of the external magnetic field, and the model is applied to an Nd-Fe-B permanent magnet alloy to verify the feasibility thereof.

Description

technical field [0001] The invention relates to the field of phase field methods, in particular to a phase field analysis method for the evolution of ferromagnetic grains under a magnetic field. Background technique [0002] The rapid development of computer technology has given birth to a new interdisciplinary subject - Computational Materials Science, which uses computer simulation methods to study many problems in the field of materials science and engineering, which can not only save experimental costs and time, but also combine with traditional theories. Combining with experimental research methods, it can go deeper into the mechanism level of materials. Among various computational simulation methods, the phase field method belonging to the microscopic to mesoscopic scale is based on material thermodynamics and dynamics, which can give the direction and specific change path of the internal microstructure of the material, and reproduce the various phase transition proces...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16C10/00
Inventor 王刚冯子康伍雪花曾德长
Owner SOUTH CHINA UNIV OF TECH
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