论文部分内容阅读
采用摩擦搅拌工艺制备Al/Al_2Cu原位纳米复合材料,研究摩擦搅拌工艺参数如旋转速率、行进速率、搅拌道次和搅拌针形状对铝基纳米复合材料显微组织、化学反应和显微硬度的影响。由于摩擦搅拌工艺的机械活化效应以及Al-Cu放热反应产生大量的热,Al_2Cu粒子快速形成。纳米复合材料的显微组织包含细小晶粒的铝基体(~15μm)、未反应的铜纳米粒子以及Al_2Cu纳米强化相。Al_2Cu粒子的不规则形貌是由于摩擦搅拌过程中产生局部熔化。搅拌针直径对材料的显微组织和硬度具有较大的影响。与基体合金相比,所得复合材料的硬度提高了57%。
The friction stir process was used to prepare Al / Al 2 Cu in-situ nanocomposites. The effects of friction stir process parameters such as rotation rate, advancing rate, stirring pass and pin shape on microstructure, chemical reaction and microhardness of Al-based nanocomposites influences. Due to the mechanical activation effect of the friction stir process and the large amount of heat generated by the exothermic reaction of Al-Cu, Al 2 Cu particles rapidly formed. The microstructure of the nanocomposites consisted of fine-grained aluminum matrix (~ 15 μm), unreacted copper nanoparticles and Al 2 Cu nanoparticle. The irregular morphology of Al 2 Cu particles is due to local melting during friction stir. The pin diameter has a great influence on the microstructure and hardness of the material. The hardness of the composites increased by 57% compared to the matrix alloy.