粒度对高体积分数SiCp/Al复合材料微观组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2024.03.038

摘要/Abstract

摘要： 选用平均粒度组成为100% 10 μm、25% 10 μm+75% 76 μm和100% 76 μm的3种不同粒度配比组合的碳化硅颗粒为增强体,以2024铝合金为基体合金,采用热等静压工艺制备SiC_p颗粒体积分数为55%的SiC_p/Al复合材料(分别对应标记为S、G和L),研究碳化硅粒径对复合材料微观组织和力学性能的影响。结果表明,3种复合材料均由SiC、Al和Al₂Cu相组成。增加细颗粒SiC比例可以提升复合材料的弯曲强度,S、G和L制备态复合材料弯曲强度依次为515、489和422 MPa,相应的断裂应变分别为0.25%、0.30%和0.22%。通过粒度级配可以有效提高制备态复合材料的致密度和断裂应变。经490 ℃高温退火处理后,3种复合材料的弯曲强度分别降低至494、470和368 MPa,断裂应变分别提升至0.43%、0.39%和0.37%。

关键词: SiC_p/Al复合材料, 颗粒级配, 退火, 弯曲强度

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

中图分类号:

TB331

崔岩, 孟令剑, 杨越, 蒙毅, 刘园, 曹雷刚. 粒度对高体积分数SiC_p/Al复合材料微观组织和力学性能的影响[J]. 金属热处理, 2024, 49(3): 230-235.

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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