搅拌摩擦加工后铝-石墨烯-SiC 基复合材料的微观结构与性能

Microstructure and Properties of Aluminum-Graphene-SiC Matrix Composites after Friction Stir Processing.

作者信息

Wang Chen, Zhu Xianyong, Fan Yuexiang, Liu Jiaan, Xie Liangwen, Jiang Cheng, Xiao Xiong, Wu Peng, You Xiangmi

机构信息

School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130022, China.

Chongqing Research Institute, Jilin University, Chongqing 401123, China.

出版信息

Materials (Basel). 2024 Feb 20;17(5):979. doi: 10.3390/ma17050979.

Enhancing the mechanical properties of conventional ceramic particles-reinforced aluminum (Al 1060) metal matrix composites (AMCs) with lower detrimental phases is difficult. In this research work, AMCs are reinforced with graphene nanosheet (GNS) and hybrid reinforcement (GNS combined with 20% SiC, synthesized by shift-speed ball milling (SSBM), and further fabricated by two-pass friction stir processing (FSP). The effect of GNS content and the addition of SiC on the microstructure and mechanical properties of AMCs are studied. The microstructure, elemental, and phase composition of the developed composite are examined using SEM, EDS, and XRD techniques, respectively. Mechanical properties such as hardness, wear, and tensile strength are analyzed. The experimental results show that the GNS and the SiC are fairly distributed in the Al matrix via SSBM, which is beneficial for the mechanical properties of the composites. The maximum tensile strength of the composites is approximately 171.3 MPa in AMCs reinforced by hybrid reinforcements. The tensile strength of the GNS/Al composites increases when the GNS content increases from 0 to 1%, but then reduces with the further increase in GNS content. The hardness increases by 2.3%, 24.9%, 28.9%, and 41.8% when the Al 1060 is reinforced with 0.5, 1, 2% GNS, and a hybrid of SiC and GNS, respectively. The SiC provides further enhancement of the hardness of AMCs reinforced by GNS. The coefficient of friction decreases by about 7%, 13%, and 17% with the reinforcement of 0.5, 1, and 2% GNS, respectively. Hybrid reinforcement has the lowest friction coefficient (0.41). The decreasing friction coefficient contributes to the self-lubrication of GNSs, the reduction in the contact area with the substrate, and the load-bearing ability of ceramic particles. According to this study, the strengthening mechanisms of the composites may be due to thermal mismatch, grain refinement, and Orowan looping. In summary, such hybrid reinforcements effectively improve the mechanical and tribological properties of the composites.

增强具有较少有害相的传统陶瓷颗粒增强铝（Al 1060）金属基复合材料（AMC）的机械性能具有挑战性。在本研究工作中，用石墨烯纳米片（GNS）和混合增强材料（GNS与20% SiC结合，通过变速球磨（SSBM）合成，并通过两道次搅拌摩擦加工（FSP）进一步制备）对AMC进行增强。研究了GNS含量和SiC的添加对AMC微观结构和机械性能的影响。分别使用扫描电子显微镜（SEM）、能谱仪（EDS）和X射线衍射仪（XRD）技术检查所制备复合材料的微观结构、元素和相组成。分析了硬度、磨损和拉伸强度等机械性能。实验结果表明，通过SSBM，GNS和SiC在Al基体中分布均匀，这有利于复合材料的机械性能。在混合增强材料增强的AMC中，复合材料的最大拉伸强度约为171.3 MPa。当GNS含量从0增加到1%时，GNS/Al复合材料的拉伸强度增加，但随着GNS含量的进一步增加而降低。当Al 1060分别用0.5%、1%、2% GNS以及SiC和GNS的混合物增强时，硬度分别提高了2.3%、24.9%、28.9%和41.8%。SiC进一步提高了GNS增强的AMC的硬度。随着0.5%、1%和2% GNS的增强，摩擦系数分别降低了约7%、13%和17%。混合增强材料的摩擦系数最低（0.41）。摩擦系数的降低有助于GNS的自润滑、与基体接触面积的减小以及陶瓷颗粒的承载能力。根据本研究，复合材料的强化机制可能归因于热失配、晶粒细化和奥罗万强化。总之，这种混合增强材料有效地改善了复合材料的机械和摩擦学性能。