Effect of aging on mechanical properties of medium and high volume fraction SiCp/2024Al composites

doi:10.13251/j.issn.0254-6051.2024.01.020

Abstract

Abstract: SiC_p/2024Al composites with SiC_p volume fractions of 35%, 45% and 55% were prepared by hot isostatic pressing(HIP). The effects of solution and aging treatment on the hardness, bending strength and impact property of the composites were studied. The results show that the composites with different SiC_p volume fractions are all composed of Al, SiC and Al₂Cu phases and have high density, indicating the good bonding between SiC_p reinforcement and matrix alloy. The hardness of the composites can be significantly enhanced by solution and aging treatment (T6). The aging-hardness curves of the SiC_p/Al composites with SiC_p volume fractions of 35%, 45%, 55% are basically the same, with the peak-aging time being 2 h, and the hardness increment of which are 51.56%,41.51% and 18.78%, respectively. The SiC_p/2024Al composite with SiC_p volume fractions of 35% presents the most significant increase in bending strength, being from 622.48 MPa to 838.11 MPa. As the SiC_p volume fraction increases, the impact absorbed energy of the HIP state composite decreases gradually from 3.43 J to 1.00 J, which can be further reduced after T6 treatment.

Key words: SiC_p/Al composite, heat treatment, bending strength, impact property, microstructure

CLC Number:

TB333.1⁺2

Cui Yan, Liang Jiarui, Cao Leigang, Yang Yue, Liu Yuan. Effect of aging on mechanical properties of medium and high volume fraction SiC_p/2024Al composites[J]. Heat Treatment of Metals, 2024, 49(1): 131-136.

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Effect of aging on mechanical properties of medium and high volume fraction SiC_p/2024Al composites

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