Effect of Magnetic Field Frequency on Microstructures and Properties of Al/Steel Bimetal Interface by Liquid-solid Compound Casting

HUANG Mengjiao; XING Zhihui; CAO Kai; XU Chao; DU Chuanhang; SUN Jipeng; ZHAO Gaozhan; MENG Zhenyu

doi:10.3969/j.issn.1674-6457.2026.02.001

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (2) : 1-9. DOI: 10.3969/j.issn.1674-6457.2026.02.001

Process Technology in the Ordnance Industry

Effect of Magnetic Field Frequency on Microstructures and Properties of Al/Steel Bimetal Interface by Liquid-solid Compound Casting

HUANG Mengjiao, XING Zhihui, CAO Kai, XU Chao, DU Chuanhang, SUN Jipeng, ZHAO Gaozhan^*, MENG Zhenyu

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Abstract

The work aims to study the effect of different magnetic field frequencies on microstructures and properties of Al/steel bimetal interface to achieve high-quality metallurgical bonding of Al/steel interface. The Al/steel bimetal was prepared by magnetic field assisted liquid-solid composite casting process. The microstructure, phase composition and fracture layer morphology of the interface were analyzed by scanning electron microscope, energy dispersive spectroscopy and optical microscopy. The interface shear strength was tested by universal test machine. The introduction of the magnetic field did not change the phase composition of Al/steel bimetal interface. The reaction layer was mainly composed of Al₅Fe₂, Al₁₃Fe₄, τ₁-Al₂Fe₃Si₃ and τ₅-Al₈Fe₂Si phases. With the increase of the magnetic field frequency (1, 3, 6, 9 Hz), the morphology of the reaction layer near the aluminum side was dentiform, necking, dentate and continuous dentate. The thickness of the reaction layer decreased first and then tended to be stable, from 9.21 μm without magnetic field to 6.24 μm at 9 Hz. The interface shear strength exhibited an initial increase followed by a decrease with the increasing magnetic field frequency, reaching the maximum of 39.20 MPa at the frequency of 3 Hz, which was 83.8% higher than that without magnetic field. Thus, the introduction of magnetic field in the liquid-solid composite casting process can effectively improve the microstructure of Al/steel bimetal interface and significantly enhance the interfacial bonding property.

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magnetic field / Al/steel bimetal / liquid-solid compound casting / interface microstructure / bonding property

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HUANG Mengjiao, XING Zhihui, CAO Kai, XU Chao, DU Chuanhang, SUN Jipeng, ZHAO Gaozhan, MENG Zhenyu. Effect of Magnetic Field Frequency on Microstructures and Properties of Al/Steel Bimetal Interface by Liquid-solid Compound Casting[J]. Journal of Netshape Forming Engineering. 2026, 18(2): 1-9 https://doi.org/10.3969/j.issn.1674-6457.2026.02.001

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