Study on Microstructure and Properties of GO/AlSi10Mg Composites Deposited by Laser Melting

doi:10.3901/JME.2023.01.309

Abstract

Abstract: Aiming at the problems of poor strength and toughness of aluminum alloy deposited by laser melting, a solvent evaporation method is proposed to prepare GO/AlSi10Mg composite powders with high powder sphericity, good fluidity, high laser absorption and evenly dispersed graphene oxide (GO). Laser melting deposition (LMD) is used to print AlSi10Mg and GO/AlSi10Mg forming parts, separately. The microstructures and mechanical properties of the two LMD forming parts are compared and analyzed, and the mechanism of GO regulating the strength and toughness of AlSi10Mg alloy forming parts is explored. The results show that the tensile strength of the LMD forming composite with 0.1wt% GO increase by 10.3%, the elongation increase by 170%, the hardness increase by 5.8%, and the tensile fracture change from brittle fracture to ductile fracture. GO undergoes a reduction reaction under the action of a high-energy laser to generate graphene, and graphene has the effect of grain refinement on the composite material. During the tensile test, dislocations gather and entangle near the graphene. The pinning effect of the graphene in the aluminum matrix hinders the movement of the dislocations and promotes the proliferation of the dislocations, and the graphene has a strong interface bond with the Al matrix, and plays the role of load transfer and bridging. Due to grain refinement, dislocation strengthening, load transfer strengthening and bridging effects, the proposed LMD technology of GO/AlSi10Mg improves the strength and toughness of aluminum alloy forming parts, and provides an effective technical method for the application and development of aluminum alloy laser melting deposition technology.

Key words: laser melting deposition, AlSi10Mg alloy, graphene oxide, strengthening and toughening mechanism, solvent evaporation method

CLC Number:

TN249

LI Xintong, WANG Shuai, DU Jiaxin, MIAO Yuxin, LU Hao, XU Jijin. Study on Microstructure and Properties of GO/AlSi10Mg Composites Deposited by Laser Melting[J]. Journal of Mechanical Engineering, 2023, 59(1): 309-318.

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