Effect of Sc element on microstructure and properties of selective laser melted TiB2/AlSi10Mg composite

doi:10.13251/j.issn.0254-6051.2020.08.012

Abstract

Abstract: TiB₂/AlSi10Mg composite modified by rare earth element Sc was prepared by selective laser melting (SLM). Effect of element Sc on the microstructure, density, and properties of the composite was studied by using field emission scanning electron microscope, electron probe microanalyzer, micro-hardness tester and electronic universal testing machine. The results show that compared with TiB₂/AlSi10Mg composite, the addition of rare earth Sc can further refine the Al-Si eutectic, resulting in fine-grained strengthening and dispersion strengthening. The ultimate tensile strength and microhardness of TiB₂/AlSi10MgSc composite are increased by 56.7 MPa (14.4%) and 15.3 HV0.1 (11.3%), respectively. The hardness and the strength of the selective laser melted TiB₂/AlSi10MgSc composite are gradually decreased with the increase of solution temperature, but its elongation is significantly improved.

Key words: selective laser melting (SLM), aluminum matrix composite, Sc element, fine-grain strengthening, dispersion strengthening

CLC Number:

TG665

Liu Yuxuan, Wang Richu, Cai Zhiyong, Zhou Zhaohui, Li Xiaogeng, Cao Xuanyang. Effect of Sc element on microstructure and properties of selective laser melted TiB₂/AlSi10Mg composite[J]. Heat Treatment of Metals, 2020, 45(8): 56-63.

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Effect of Sc element on microstructure and properties of selective laser melted TiB₂/AlSi10Mg composite

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