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Nanocrystallization of Fe-Base Amorphous Soft Magnetic Alloy by Laser Irradiation

Author: ZhangGuoRui
Tutor: JiangYiJian；BaoYong
School: Beijing University of Technology
Course: Optical Engineering
Keywords: Laser irradiation Fe-based amorphous alloy Of nanocrystallization Soft magnetic properties
CLC: TN249
Type: Master's thesis
Year: 2011
Downloads: 35
Quote: 1
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Abstract


Iron based nanocrystalline alloy Fe 73.5 Cu 1 Nb 3 < / sub> Si 13.5 B 9 (FINEMET) is an excellent soft magnetic material, its coercive field is low , the initial magnetic permeability is high, and has a high saturation magnetic flux density , and a very low high-frequency loss , good thermal stability and low the cost has been widely used in the fields of electricity and electronics . However the nanocrystalline alloys traditional furnace heat treatment process steps and more time-consuming , high energy consumption , temperature control deviation caused by a higher rate of product obsolescence . The laser is a high-energy beam efficient laser processing short , highlight the advantages of a high degree of accuracy and automation control . Fe-based amorphous alloy nanocrystals study by laser irradiation is an important practical value of scientific issues . In this paper, the inner diameter of 14 mm and 20 mm OD ring of iron -based amorphous alloy sample , CO 2 laser and Yb-doped fiber laser at two different wavelengths of the laser beam , laser-based photothermal Fe-based amorphous alloy Fe rotation irradiation 73.5 Cu 1 Nb 3 Si 13.5 nano 9 of crystallization and laser irradiation Fe-based amorphous alloy nanocrystallization mechanism of a preliminary analysis and discussion . By XRD and TEM , select the appropriate irradiation power and irradiation time , CO 2 laser and Ytterbium fiber laser irradiation , the iron-based contrast observation and analysis of the samples before and after the irradiation amorphous alloy sample will produce a grain size of about 10 nm , and the grains are randomly distributed in the amorphous matrix and the crystalline phase of α-Fe (Si) of the body-centered cubic structure phase . Meanwhile , VSM and the soft magnetic closure DC test results indicate that the Fe-based nanocrystalline alloy having excellent soft magnetic properties obtained after the laser irradiation , and its coercive field is low, the magnetization process is almost reversible, but also a higher initial permeability . So that the laser irradiation is a very effective method of preparation of iron -based nanocrystalline alloys , the feasibility .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser applications
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