Properties of B4Cp/Al Composites Prepared by Laser Powder Bed Fusion

doi:10.3901/JME.260120

Abstract

Abstract: In order to solve the problems of particle agglomeration, poor densification and violent interfacial reaction leading to a large number of coarse needle-like phases during the preparation of B₄Cp/Al composites. B₄Cp/Al composites were prepared by laser powder bed melting technology. The effects of continuous/pulsed laser mode on the microstructure and mechanical properties of B₄Cp/Al composites were studied. The results show that with the increase of energy density, the density of B₄Cp/Al composites increases first and then decreases, and reaches the maximum of 99.43% when the energy density is 38 J/mm³. At the same energy density, B₄C is prone to interfacial reaction with Al matrix during continuous laser preparation, forming interfacial products Al₃BC and Al₄C₃ brittle phases, which leads to the decrease of interfacial bonding properties, the periodic action of the pulsed laser can effectively inhibit the interfacial reaction and promote the homogeneous dispersion of the B₄C particles, and the generation of the brittle phase Al₄C₃ is not found in the specimens, but the defects in the specimens were obviously more. The tensile strength of the continuous/pulsed laser specimens reach 433.42 MPa and 420.69 MPa, respectively, and the fracture mode of both is brittle fracture. Numerical analysis is used to analyze the melt pool morphology and temperature changes during LPBF.

Key words: laser powder bed fusion, pulsed laser, B₄Cp/Al composites, densification, microstructure, mechanical property

CLC Number:

TG156

HAN Xinyu, LIU Junsong, SHI Yan. Properties of B₄Cp/Al Composites Prepared by Laser Powder Bed Fusion[J]. Journal of Mechanical Engineering, 2026, 62(4): 224-232.

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Properties of B₄Cp/Al Composites Prepared by Laser Powder Bed Fusion

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