工程科学学报，第41卷，第9期：1162-1167,2019年9月 Chinese Joural of Engineering,Vol.41,No.9:1162-1167,September 2019 D0L:10.13374/j.issn2095-9389.2019.09.007:htp:/journals.usth.edu.cm 石墨烯含量对石墨烯/A1-15Si-4Cu-Mg复合材料微观 组织和力学性能的影响 水 丽区，张凯，于宏 沈阳理工大学机械工程学院，沈阳110159 区通信作者，E-mail:shuilisy@163.com 摘要低温球磨分散结合真空热压烧结工艺制备了石墨烯增强的A-15Si-4Cu-Mg基复合材料.采用扫描电镜，X射线衍 射、能谱分析和透射电镜表征了复合材料微观结构，通过抗拉强度和硬度测试，研究了石墨烯添加量对石墨烯/-15Si-4Cu- Mg复合材料微观组织和力学性能的影响.结果表明：当石墨烯质量分数分别为0.4%和0.8%，石墨烯沿基体晶界均匀分布， 钉扎晶界，石墨烯与A-15Si-4Cu-Mg基体界面结合良好，初晶B-Si、MgSi和AL,Cu相弥散分布于基体中.当石墨烯质量分 数上升至1%，石墨烯分散困难，过量石墨烯富集于晶粒边界处，诱发脆性鱼骨状AL,C2MgSi,相沿晶界析出.当石墨烯质量 分数为0.8%时，石墨烯/Al-15Si-4Cu-Mg复合材料的拉伸强度和硬度分别达到321MPa和HV98,相比纯Al-15Si-4Cu-Mg 复合材料分别提高了19.3%和46.2%；当石墨烯质量分数为0.4%时，复合材料的屈服强度高达221MPa,硬度和塑性亦获得 明显改善 关键词石墨烯/A1-15Si-4Cu-Mg复合材料；石墨烯；微观组织；力学性能；硬度 分类号TB333 Effect of graphene content on the microstructure and mechanical properties of graphene-reinforced Al-15Si-4Cu-Mg matrix composites SHUI Li,ZHANG Kai,YU Hong School of Mechanical Engineering,Shenyang Ligong University,Shengyang 110159,China Corresponding author,E-mail:shuilisy@163.com ABSTRACT A graphene-nanoflakes (GNFs)-reinforced GNFs/Al-15Si-4Cu-Mg composite was prepared through low-temperature ball-grinder milling and vacuum hot-press sintering.The influences of the GNFs mass content on the microstructural and mechanical properties of the GNFs/Al-15Si-4Cu-Mg composite were investigated via scanning electron microscope,X-ray diffraction,energy dis- perse spectroscopy,and transmission electron microscope.Meanwhile,tensile strength and micro-hardness tests were conducted.The corresponding result show that for the specimens with 0.4%and 0.8%mass fraction)GNFs in mass fraction,the nanoflakes are con- centrated on the border of the aluminum alloy grain and played a major role in restraining the matrix grain expansion and avoiding crys- tal particle coarsening.Moreover,the interface bonding between the GNFs and Al-15Si-4Cu-Mg matrix is strong.There are primary B-Si particles,MgSi,and Al,Cu-phase precipitated dispersedly throughout the aluminum matrix.The strong interface bonding be- tween the GNFs and Al-15Si-4Cu-Mg matrix leads to the effective impeding of the dislocation slippage and the improvement in the properties of the GNFs/Al-15Si-4Cu-Mg composites.With the addition of the 1.0%GNFs,it is difficult for the GNFs to disperse but easy for them to cluster together to form black impurities on the grain border,inducing brittle Al Cu,MgsSi,phase precipitation along the aluminum alloy grain boundary.As the content of GNFs increases,the composite tensile strength first increases and then decreases. 收稿日期：2018-08-10工程科学学报,第 41 卷,第 9 期:1162鄄鄄1167,2019 年 9 月 Chinese Journal of Engineering, Vol. 41, No. 9: 1162鄄鄄1167, September 2019 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2019. 09. 007; http: / / journals. ustb. edu. cn 石墨烯含量对石墨烯 / Al鄄鄄15Si鄄鄄4Cu鄄鄄Mg 复合材料微观 组织和力学性能的影响 水 丽苣 , 张 凯, 于 宏 沈阳理工大学机械工程学院, 沈阳 110159 苣通信作者, E鄄mail:shuilisy@ 163. com 摘 要 低温球磨分散结合真空热压烧结工艺制备了石墨烯增强的 Al鄄鄄15Si鄄鄄4Cu鄄鄄Mg 基复合材料. 采用扫描电镜、X 射线衍 射、能谱分析和透射电镜表征了复合材料微观结构,通过抗拉强度和硬度测试,研究了石墨烯添加量对石墨烯/ Al鄄鄄15Si鄄鄄4Cu鄄鄄 Mg 复合材料微观组织和力学性能的影响. 结果表明:当石墨烯质量分数分别为 0郾 4% 和 0郾 8% ,石墨烯沿基体晶界均匀分布, 钉扎晶界,石墨烯与 Al鄄鄄15Si鄄鄄4Cu鄄鄄Mg 基体界面结合良好,初晶 茁鄄鄄 Si、Mg2 Si 和 Al 2Cu 相弥散分布于基体中. 当石墨烯质量分 数上升至 1% ,石墨烯分散困难,过量石墨烯富集于晶粒边界处,诱发脆性鱼骨状 Al 4Cu2Mg8 Si 7相沿晶界析出. 当石墨烯质量 分数为 0郾 8% 时,石墨烯/ Al鄄鄄15Si鄄鄄4Cu鄄鄄Mg 复合材料的拉伸强度和硬度分别达到 321 MPa 和 HV 98,相比纯 Al鄄鄄15Si鄄鄄4Cu鄄鄄Mg 复合材料分别提高了 19郾 3% 和 46郾 2% ;当石墨烯质量分数为 0郾 4% 时,复合材料的屈服强度高达 221 MPa,硬度和塑性亦获得 明显改善. 关键词 石墨烯/ Al鄄鄄15Si鄄鄄4Cu鄄鄄Mg 复合材料; 石墨烯; 微观组织; 力学性能; 硬度 分类号 TB333 收稿日期: 2018鄄鄄08鄄鄄10 Effect of graphene content on the microstructure and mechanical properties of graphene鄄reinforced Al鄄鄄15Si鄄鄄4Cu鄄鄄Mg matrix composites SHUI Li 苣 , ZHANG Kai, YU Hong School of Mechanical Engineering, Shenyang Ligong University, Shengyang 110159, China 苣Corresponding author, E鄄mail: shuilisy@ 163. com ABSTRACT A graphene鄄nanoflakes (GNFs)鄄reinforced GNFs/ Al鄄鄄15Si鄄鄄4Cu鄄鄄 Mg composite was prepared through low鄄temperature ball鄄grinder milling and vacuum hot鄄press sintering. The influences of the GNFs mass content on the microstructural and mechanical properties of the GNFs/ Al鄄鄄15Si鄄鄄4Cu鄄鄄Mg composite were investigated via scanning electron microscope, X鄄ray diffraction, energy dis鄄 perse spectroscopy, and transmission electron microscope. Meanwhile, tensile strength and micro鄄hardness tests were conducted. The corresponding result show that for the specimens with 0郾 4% and 0郾 8% (mass fraction) GNFs in mass fraction, the nanoflakes are con鄄 centrated on the border of the aluminum alloy grain and played a major role in restraining the matrix grain expansion and avoiding crys鄄 tal particle coarsening. Moreover, the interface bonding between the GNFs and Al鄄鄄15Si鄄鄄4Cu鄄鄄Mg matrix is strong. There are primary 茁鄄鄄 Si particles, Mg2 Si, and Al 2 Cu鄄phase precipitated dispersedly throughout the aluminum matrix. The strong interface bonding be鄄 tween the GNFs and Al鄄鄄15Si鄄鄄4Cu鄄鄄Mg matrix leads to the effective impeding of the dislocation slippage and the improvement in the properties of the GNFs/ Al鄄鄄15Si鄄鄄4Cu鄄鄄Mg composites. With the addition of the 1郾 0% GNFs, it is difficult for the GNFs to disperse but easy for them to cluster together to form black impurities on the grain border, inducing brittle Al 4Cu2Mg8 Si 7 phase precipitation along the aluminum alloy grain boundary. As the content of GNFs increases, the composite tensile strength first increases and then decreases