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利用高能球磨和冷压烧结工艺制备出碳纳米管(CNTs)增强Al5083复合材料,并对球磨过程中CNTs的演变及成型后复合材料的力学性能和形貌进行研究。结果表明,在球磨过程中,通过机械力的作用下带动钢球将CNTs切断,长径比变小,并均匀地分散在Al基体中;在CNTs含量为2%下,复合材料抗拉强度和屈服强度分别达到294和239 MPa,硬度达到95 HV5,复合材料的力学性能最好。通过观察复合材料的断口,随着碳纳米管含量的增加,复合材料的断口形貌从韧性断裂向脆性断裂转变。
Carbon nanotubes (CNTs) reinforced Al5083 composites were prepared by high energy ball milling and cold pressing sintering process. The evolution of CNTs during ball milling and the mechanical properties and morphology of the composites were studied. The results show that in the process of ball milling, the CNTs are cut by the mechanical force and the aspect ratio becomes smaller and uniformly dispersed in the Al matrix. When the CNTs content is 2%, the tensile strength and The yield strength reached 294 and 239 MPa respectively, and the hardness reached 95 HV5. The mechanical properties of the composites were the best. By observing the fracture of the composite, the fracture morphology of the composite changes from ductile fracture to brittle fracture with the increase of the content of carbon nanotubes.