摘要
利用搅拌铸造技术制备SiO_(2)增强富铁铝基复合材料,采用金相显微镜、X射线衍射仪、扫描电子显微镜、能谱仪分析复合材料微观组织和界面结构,采用布氏硬度计、电子万能试验机测量复合材料的力学性能。结果表明:Mg的存在促进SiO_(2)颗粒在基体中均匀分布,并使粗大针状铁相细化,SiO_(2)颗粒在反应过程中逐步转变为Al_(2)O_(3),加入Mg之后,原位反应产物出现了MgAl_(2)O_(4)。增强体颗粒在反应过程中破碎,细化的颗粒强化了力学性能。当Mg含量质量分数达到1.5%时复合材料的性能最优,硬度和抗拉强度分别为HB 92.1和147 MPa。
SiO_(2)reinforced iron-rich aluminum matrix composites were prepared by stirring casting technology.The microstructure and interface structure of the composites were analyzed by optical microscopy(OM),X-ray diffraction(XRD),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The mechanical properties of the composites were measured by Brinell hardness tester and electronic universal testing machine.The results showed that the presence of Mg promoted the uniform distribution of SiO_(2)particles in the matrix,and refined the coarse acicular iron phase.SiO_(2) particles gradually changed into Al_(2)O_(3)during the reaction process.After adding Mg,MgAl_(2)O_(4)appeared in the in-situ reaction product.The reinforcement particles were broken during the reaction,and the refined particles strengthen the mechanical properties.The composites had the best properties when the Mg content reached 1.5%,and the hardness and tensile strength were HB 92.1 and 147 MPa.
作者
雷智钦
王康
张文泉
李文芳
LEI Zhi-qin;WANG Kang;ZHANG Wen-quan;LI Wen-fang(School of Materials Science and Engineering,Dongguan University of Technology,Dongguan 523000,Guangdong,China)
出处
《铸造》
CAS
北大核心
2023年第10期1303-1310,共8页
Foundry
基金
广东省基础与应用基础研究基金(No.2019A1515110135,No.2021A1515010587,No.2021B1515130010)
中科院科技网络服务计划(STS)-东莞专项(No.20211600200082)。
