Zhang Xiao, Zou Linchi, Chen Junfeng, Dai Pinqiang, Pan Jian
College of Materials Science and Engineering, Fujian University of Technology, 3 Xueyuan Road, University Town, Fuzhou City 350118, China.
Fujian Provincial Key Laboratory of Advanced Materials Processing and Application, 3 Xueyuan Road, University Town, Fuzhou City 350118, China.
Materials (Basel). 2022 Jan 23;15(3):864. doi: 10.3390/ma15030864.
In order to effectively solve the problem of strength and ductility mismatch of magnesium (Mg) matrix composites, carbon nanotubes (CNTs) are added as reinforcement. However, it is difficult to uniformly disperse CNTs in a metal matrix to form composites. In this paper, electrophoretic deposition (EPD) was used to obtain layered units, and then the CNTs/Mg layered units were sintered by spark plasma sintering to synthesize layered CNTs/Mg composites. The deposition morphology of the layered units obtained by EPD and the microstructure, damping properties, and mechanical properties of the composite material were analyzed. The results show that the strength and ductility of the composite sample sintered at 590 °C were improved compared with the layered pure Mg and the composite sample sintered at 600 °C. Compared with pure Mg, the composites rolled by 40% had a much higher strength but no significant decrease in ductility. The damping properties of the CNTs/Mg composites were tested. The damping-test-temperature curve (tanδ~T) rose gradually with increasing temperature in the range of room temperature to 350 °C, and two internal friction peaks appeared. The damping properties of the tested composites at room temperature decreased with increasing frequency. The layered structure of the CNTs/Mg had ultra-high strengthening efficiency and maintained its ductility. The layered units prepared by EPD can uniformly disperse the CNTs in the composites.
为有效解决镁（Mg）基复合材料强度与延展性不匹配的问题，添加了碳纳米管（CNTs）作为增强体。然而，将碳纳米管均匀分散在金属基体中以形成复合材料具有一定难度。本文采用电泳沉积（EPD）法获得层状单元，然后通过放电等离子烧结对碳纳米管/镁层状单元进行烧结，以合成层状碳纳米管/镁复合材料。分析了通过电泳沉积获得的层状单元的沉积形貌以及该复合材料的微观结构、阻尼性能和力学性能。结果表明，与层状纯镁以及在600℃烧结的复合样品相比，在590℃烧结的复合样品的强度和延展性有所提高。与纯镁相比，轧制40%后的复合材料强度更高，但延展性无显著降低。对碳纳米管/镁复合材料的阻尼性能进行了测试。在室温至350℃范围内，阻尼测试温度曲线（tanδ~T）随温度升高而逐渐上升，并出现两个内耗峰。测试的复合材料在室温下的阻尼性能随频率增加而降低。碳纳米管/镁的层状结构具有超高的强化效率并保持了其延展性。通过电泳沉积制备的层状单元能够将碳纳米管均匀分散在复合材料中。
