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采用搅拌摩擦加工法制备了不同体积分数碳纳米管增强AZ80镁基复合材料,考察了固溶+时效热处理对复合材料的微观组织和力学性能的影响。结果表明:镁基复合材料组织致密,晶粒细小,其中的碳纳米管均匀分布;热处理导致碳纳米管与AZ80基体界面上有A13Ni2化合物生成,改善了界面结构;复合材料的抗拉强度随碳纳米管体积分数的增加逐渐增加,固溶+时效处理后的复合材料的抗拉强度有所提高,影响MWCNTs/AZ80复合材料力学性能的主要因素是碳纳米管与镁基体之间的界面结合情况。
The friction stir processing method was used to prepare AZ80 magnesium matrix composites with different volume fractions of carbon nanotubes. The effects of solution treatment and aging treatment on the microstructure and mechanical properties of the composites were investigated. The results show that the microstructure of the magnesium matrix composites is dense and the grains are fine and the carbon nanotubes are uniformly distributed. The heat treatment results in the formation of A13Ni2 compound on the interface of the carbon nanotubes and the AZ80 matrix, which improves the interfacial structure. The tensile strength of the composites increases with carbon The increase of the volume fraction of nanotubes increases gradually, and the tensile strength of the composite increases after solution treatment. The main factors affecting the mechanical properties of the MWCNTs / AZ80 composites are the interfacial bonding between the carbon nanotubes and the Mg matrix .