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为了制备晶粒细小、组织均匀的复合材料,提高材料的力学性能,用搅拌摩擦加工法制备碳纳米管增强铝基复合材料,并对不同碳纳米管含量的复合材料的微观结构、拉伸性能及断口形貌进行分析。结果表明:碳纳米管添加到铝基体中,搅拌摩擦中心区晶粒细小,碳纳米管与基体之间结合良好,未发现明显的缺陷;碳纳米管对基材有明显的强化作用,铝基复合材料抗拉强度随着碳纳米管含量的增加而提高;碳纳米管体积分数为7%时,抗拉强度达到201 MPa,是基材的2.2倍;复合材料在宏观上呈现脆性断裂特征,微观上呈现韧性断裂特征,其断裂机制以CNTs/Al界面脱粘、基体撕裂和增强体断裂为主。
In order to prepare the composite material with fine grain and homogeneous structure and improve the mechanical properties of the material, the friction stir processing method was used to prepare the carbon nanotubes reinforced aluminum matrix composites. The microstructure and tensile properties of the composites with different carbon nanotubes contents And fracture morphology analysis. The results show that carbon nanotubes are added into the aluminum matrix, the grains in the friction stir center are fine, the bonding between the carbon nanotubes and the matrix is good, and no obvious defects are found; the carbon nanotubes have obvious strengthening effect on the substrate, The tensile strength of the composite increases with the increase of the content of carbon nanotubes. When the volume fraction of carbon nanotubes is 7%, the tensile strength reaches 201 MPa, which is 2.2 times that of the matrix. The composite shows macroscopical brittle fracture, Microstructure shows the characteristics of ductile fracture. The fracture mechanism mainly consists of CNTs / Al interface debonding, matrix tearing and strengthening fracture.