石墨烯纳米片/AZ91镁基复合材料制备与力学性能  

Preparation and Mechanical Properties of Graphene Nanosheets Reinforced AZ91 Alloy Composites

作　　者：袁秋红[1,2] 曾效舒[1] 吴俊斌[1] 叶达林 

机构地区：[1]南昌大学机电工程学院 [2]新余学院新能源科学与工程学院

出　　处：《特种铸造及有色合金》2016年第3期282-286,共5页Special Casting & Nonferrous Alloys

基　　金：江西省教育厅科学基金资助项目(GJJ151309)

摘　　要：采用粉末冶金和热挤压工艺制备了石墨烯(GNS)增强的AZ91镁基复合材料,测试了复合材料的力学性能,并用扫描电镜和能谱仪对复合材料断口形貌进行了观察和分析。结果表明,添加0.1%的GNS时,复合材料屈服强度、伸长率和显微硬度分别为191 MPa、6.7%和60.4(HV),比基体分别提高了19.4%、11.7%和13.5%;与添加1.0%的CNTs的AZ91镁基复合材料强度和显微硬度相当,只是伸长率略差。复合材料经热挤压变形后,GNS在基体中存在平行试棒拉伸方向、与试棒拉伸方向成一定角度和垂直试棒拉伸方向三种分布状态。其中呈垂直拉伸方向的分布状态对复合材料力学性能的提高贡献最小,这使得分散在基体中的GNS难以发挥其优越的综合力学性能,导致复合材料强度和伸长率提升幅度有限。AZ91alloy composites reinforced with Graphene nanosheets（GNS）were fabricated by powder metallurgy combining with hot extrusion technology.The mechanical properties of the composites were tested,and the fracture morphology of the composites was observed and analyzed by scanning electron microscope equipped with energy-dispersive spectrometer（EDS）.The results reveal that the yield strength,elongation and microhardness of the AZ91-0.1%GNS composites reach 191 MPa,6.7% and60.4 HV,increased by 19.4%,11.7% and 13.5%,respectively,compared with those of AZ91 alloy matrix.The strength and microhardness of AZ91 composites with 0.1%GNS are closed to those of AZ91 alloy with 1.0% CNTs except for the ductility.There exist three kinds of distribution states of GNS in the matrix after hot extrusion,such as parallel to the tensile direction,cross the tensile direction with an angle and perpendicular to the tensile direction.However,the distribution state of GNS to the tensile direction exhibits the lowest contribution in strengthening the composites among three kinds of distribution,which limits significantly the improvement in the strength and elongation of the composites.

关 键 词：AZ91镁合金 GNS 复合材料 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]