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CSME 2025/08
Volume 46 No.4
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455-460
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Effect of Cold-Rolling and Annealing on Microstructural and Magnetic Properties of 79HM Soft Magnetic Alloy Manufactured by Vacuum Induction Melting
Phung Tuan Anh a, Tran Van Nghia b, Nguyen Van Hoang c and Nguyen Manh Hung c
aAssociate Professor, Department of Materials Science and Engineering, Le Quy Don Technical University, Hanoi, 100000, Vietnam
bLecturer, Department of Materials Science and Engineering, Le Quy Don Technical University, Hanoi, 100000, Vietnam
cDoctor of Philosophy in Materials Science and Engineering, Department of Materials Science and Engineering, Le Quy Don Technical University, Hanoi, 100000, Vietnam
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Abstract:
In this study, the effect of cold-rolling and annealing on the microstructural and magnetic properties of 79HM permalloy alloy was investigated systematically. The alloy was fabricated in a vacuum environment using a vacuum induction furnace (VIF), and followed by homogenization and cold-rolling processes. The grain size, grain morphology, hardness, chemical composition, and magnetic properties of the resulting alloy were analyzed by various materials characterization techniques, including optical microscopy, Vickers hardness testing method, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) integrated with a scanning electron microscope, and vibrating-sample magnetometry (VSM) technique. The experimental data show that the hardness and coercivity of the alloy
increase significantly with the increase of cold-rolling degree, and reach maximum values of 320 HV5 and 496 A/m, respectively. However, upon suitable annealing conditions, the alloy can reach a coercivity value of 7.2 A/m, while its saturation magnetization is further enhanced. In addition, the effect of the annealing treatment on the recrystallization process and the magnetic properties of the 79HM permalloy alloy were also considered.
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Keywords: Soft magnetic alloy, Ni-Fe-based alloys, 79HM permalloy alloy, cold-rolling, vacuum induction melting.
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©
2025
CSME , ISSN 0257-9731
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