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
Effect of particle size on microstructure and mechanical properties of high volume fraction SiCp/Al composites
崔岩 1孟令剑 1杨越 1蒙毅 1刘园 1曹雷刚1
作者信息
- 1. 北方工业大学机械与材料工程学院,北京 100144
- 折叠
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SiCp颗粒体积分数为55％的SiCp/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％.
Abstract
In order to investigate the effect of SiC particle size on the microstructure and mechanical properties of SiCp/Al composites,three kinds of SiCp/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.
关键词
SiCp/Al复合材料/颗粒级配/退火/弯曲强度Key words
SiCp/Al composite/particle gradation/annealing/flexural strength引用本文复制引用
基金项目
国家重点研发计划(2022YFB3705702)
出版年
2024
NETL
NSTL
万方数据