原位合成TiC/Al(7075)复合材料的组织及力学性能  

Microstructure and mechanical properties of TiC/Al(7075) composites fabricated by in situ reaction

作　　者：吴瑞瑞[1] 李秋书[1] 郭璐[1] 马雁翔[1] 王荣峰[1] 

机构地区：[1]太原科技大学材料科学与工程学院,太原030024

出　　处：《复合材料学报》2017年第6期1334-1339,共6页Acta Materiae Compositae Sinica

基　　金：山西省研究生教育创新项目(2016BY137);晋城市科技计划项目(201501004-13)

摘　　要：采用原位合成法制备TiC/Al(7075)复合材料,研究原位TiC颗粒的存在形式、分布状态及不同原位TiC颗粒含量对TiC/Al(7075)复合材料的微观组织及力学性能的影响。结果显示,TiC颗粒多以近球形团聚态存在于7075铝基体中,颗粒团大小约为1μm。当原位TiC颗粒质量分数小于6%时,原位TiC颗粒分布较为均匀,随着颗粒含量的增加,TiC/Al(7075)复合材料的铸态组织由蔷薇状组织逐渐转变为等轴晶组织,晶粒尺寸也随着原位TiC颗粒含量的增加而减小。当原位TiC颗粒的质量分数大于6%时,组织中出现气孔。复合材料的硬度和抗冲击韧性测试表明,TiC/Al(7075)复合材料的硬度随TiC颗粒含量的增加而增加,最高硬度达HB 108,冲击韧性在颗粒质量分数为6%时达到最佳,较基体提升31.55%。TiC/Al（7075） composites were fabricated by in situ reaction. The influence of in situ TiC particles form, distribution state and content on the microstructure and mechanical properties of the TiC/Al（7075） compo- sites were discussed. The results show that most spherical in situ TiC particles with aggregate exists in 7075 matrix, the cluster of grain size is about 1 gm. When the mass fraction of in situ TiC particles is less than 6%, the TiC distribution is more uniform. With the increase of in situ TiC particles, the grain sizes of the TiC/Al（7075） composites decrease significantly. But the porosity appear in the microstrcuture when the mass fraction of in situ TiC particles is more than 6%. Hardness and toughness of composite material testing shows that with the increase of the TiC particle concentration, the highest hardness of the surface reaches HB 108, the composites with 6% TiC have the best toughness, the toughness increases by 31.55% compared with the 7075 matrix.

关 键 词：原位合成 7075铝合金 TIC颗粒 复合材料 硬度 冲击韧性 

分 类 号：TB331[一般工业技术—材料科学与工程]