Effect of Rotating Magnetic Field on the Microstructure and Shear Property of Al/Steel Bimetallic Composite by Compound Casting

doi:10.1007/s40195-024-01802-0

Abstract

Abstract:

Al/steel bimetallic composites were prepared by compound casting, and the effects of the rotating magnetic field on the interfacial microstructure and shear property of bimetallic composite was investigated. The application of rotating magnetic field refined the grain structure of the Al alloy matrix, changed the eutectic Si morphology from coarse lath to needle-like. The rotating magnetic field improved the temperature field and solute distribution of the Al alloy melt, enriched a layer of Si at the interface, and suppressed the growth of intermetallic compounds, the thickness of the interface layer decreased from 44.9 μm to 22.8 μm. The interfacial intermetallic compounds consisted of η-Al₅Fe₂, θ-Al₁₃Fe₄, τ₆-Al_4.5FeSi, τ₅-Al₈Fe₂Si and τ₃-Al₂FeSi, and the addition of the rotating magnetic field did not change phase composition. The rotating magnetic field improved the stress distribution within the interfacial intermetallic compounds, the presence of high-angle grain boundaries retarded crack extension, and the shear strength was enhanced from 31.27 ± 3 MPa to 52.70 ± 4 MPa. This work provides a feasible method for preparing Al/steel bimetallic composite with good bonding property.

Key words: Al/steel bimetallic composite, Rotating magnetic field, Intermetallic compounds, Interface, Compound casting

Weize Lv, Guowei Zhang, Heqian Song, Dan Zhang, Shiyuan Liu, Hong Xu. Effect of Rotating Magnetic Field on the Microstructure and Shear Property of Al/Steel Bimetallic Composite by Compound Casting[J]. Acta Metallurgica Sinica (English Letters), 2025, 38(2): 276-286.

Figures/Tables 13

Table 1 Chemical compositions of Al-7Si-Cu-Mg-Mn alloys (wt%)

Si	Cu	Mg	Mn	Al
7.11	2.34	0.39	0.16	Bal.

Fig. 1 Schematic diagram of experimental flow and sampling: a experimental procedure; b Al/steel bimetallic composite specimen; c microstructure specimen; d shear specimen; e shear test diagram

Fig. 2 Al/steel bimetallic microstructure: a, b without magnetic field; c, d with rotating magnetic field

Fig. 3 SEM images and EDS results of the Al/steel bimetallic composite interface without magnetic field: a SEM micrograph; b elemental distribution; c elemental distribution of the line shown in a

Fig. 4 SEM images and EDS results of the Al/steel bimetallic composite interface under rotating magnetic field: a SEM micrograph; b elemental distribution; c elemental distribution of the line shown in a

Fig. 5 TEM microstructure and SADE diffraction patterns of Al/steel bimetallic composite without magnetic field: a-c TEM images at different positions; d-g SAED diffraction patterns corresponding to phase A-D in a-c

Fig. 6 TEM microstructure and SADE diffraction patterns of Al/steel bimetallic composite under rotating magnetic field: a-d TEM images at different positions; e-i SAED diffraction patterns corresponding to phase A-E in a-d

Fig. 7 Grain orientation and grain boundary diagram of the Al matrix: a without magnetic field; b with rotating magnetic field

Fig. 8 Grain orientation and polar diagram of the Al/steel bimetallic composite: a, a1, a2 without magnetic field; b, b1, b2 with rotating magnetic field

Fig. 9 Distribution of HAGBs and LAGBs in Al/steel bimetallic composite: a-c without magnetic field; d-f with rotating magnetic field

Fig. 10 KAM map of Al/steel bimetallic composite: a-c without magnetic field; d-f with rotating magnetic field

Fig. 11 Average shear strength of Al/steel bimetallic composites under different conditions

Fig. 12 Schematic diagram of reaction layer formation et al./steel bimetallic composite interface: a-d without magnetic field; e-h with rotating magnetic field

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