ZnO改性石墨烯-镁基复合材料微观组织与性能

Microstructure and Properties of ZnO Modified Graphene-Mg Matrix Composites

采用化学共沉积法合成了ZnO改性石墨烯纳米片(GNS)并添加到AZ91D合金中制备了AZ91D-0.1GNS镁基复合材料,测试了复合材料的力学性能,并利用光学显微镜、X射线衍射仪、X射线光电子能谱仪、扫描电镜和能谱仪对ZnO改性GNS复合材料显微组织和断口形貌进行了表征与分析。结果表明,ZnO能有效包覆到GNS表面,显著提高了镁合金的强度、伸长率和显微硬度。ZnO改性GNS显著细化镁合金的晶粒组织,改善了GNS与镁基体的强界面结合质量,细晶强化、应力转移强化效果明显。

Graphene nanosheets modified by ZnO(ZnO@GNS)were synthesized by chemical co-deposition process and added into AZ91D alloy to fabricate the AZ91D-0.1GNS composites.The mechanical properties of composites were investigated,and the microstructure and fracture morphologies of ZnO@GNS were characterized and analyzed by OM,XPS,XRD,SEM and EDS.The results indicate that ZnO@GNS can be effectively coated on surface of GNS,significantly improving the strength,elongation and microhardness of alloys.ZnO modified GNS can significantly refine the grain structure of magnesium alloy,enhancing the bonding quality of strong interface between GNS and magnesium matrix,leading to obvious fine crystal strengthening and stress transfer strengthening.