Effect of particle size on microstructure and mechanical properties of high volume fraction SiCp/Al composites

doi:10.13251/j.issn.0254-6051.2024.03.038

Abstract

Abstract: In order to investigate the effect of SiC particle size on the microstructure and mechanical properties of SiC_p/Al composites, three kinds of SiC_p/2024Al composites containing 55%(volume fraction) SiC particles with size compositions being 100% 10 μm, 25% 10 μm+75% 76 μm and 100% 76 μm were fabricated by hot isostatic pressing and labelled as S, G and L, respectively. The results show that all the three SiC/2024Al composites contain SiC, Al and Al₂Cu phases. The flexural strength of the tested composites can be enhanced by increasing the proportion of fine SiC particles. The flexural strengths of S, G and L composites are 515, 489 and 422 MPa, respectively, and the corresponding fracture strains are 0.25%, 0.30% and 0.22%, respectively, indicating that the SiC particle gradation is an effective method to improve the density and the fracture strain of the composite. After annealing at 490 ℃, the flexural strengths of the three composites decrease to 494, 470 and 368 MPa, respectively, and the corresponding fracture strains increase significantly to 0.43%, 0.39% and 0.37%, respectively.

Key words: SiC_p/Al composite, particle gradation, annealing, flexural strength

CLC Number:

TB331

Cui Yan, Meng Lingjian, Yang Yue, Meng Yi, Liu Yuan, Cao Leigang. Effect of particle size on microstructure and mechanical properties of high volume fraction SiC_p/Al composites[J]. Heat Treatment of Metals, 2024, 49(3): 230-235.

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Effect of particle size on microstructure and mechanical properties of high volume fraction SiC_p/Al composites

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