In the present study, friction stir processing was adopted for surface treatment of Al5083 by incorporation of CNT and Al2O3 nanoparticles. Microstructural, mechanical and tribological properties of the surface of Al5083/CNT, Al5083/Al2O3 and hybrid Al5083/CNT/Al2O3 nanocomposite were investigated and compared. The friction stir processing yielded a nearly uniform dispersion of CNTs and Al2O3 nanoparticles, irrespective of nanoparticle reinforcements and their weight fraction. Microstructural observations revealed that Al2O3 nanoparticles have dispersed in different zones including intra-grain and grain boundary zones while, CNTs are pinned into grain boundaries during friction stir processing. From mechanical point of view, hybridization of CNT/Al2O3 enhances the hardness (126 HV at stirred zone), strength (UTS of ∼487 MPa) and also wear resistance of Al5083/CNT/Al2O3 nanocomposites. The enhancement is attributed to the presence and combination of features of both CNT and Al2O3 nanoparticles which are different in nature; one spherical oxide and one nanotube.

中文翻译：

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使用搅拌摩擦加工制备由碳纳米管和 Al2O3 纳米颗粒增强的 Al5083 表面杂化纳米复合材料

在本研究中，通过掺入 CNT 和 Al2O3 纳米颗粒，采用搅拌摩擦工艺对 Al5083 进行表面处理。研究并比较了 Al5083/CNT、Al5083/Al2O3 和混合 Al5083/CNT/Al2O3 纳米复合材料表面的微观结构、机械和摩擦学性能。摩擦搅拌处理产生了几乎均匀的 CNT 和 Al2O3 纳米颗粒分散体，而与纳米颗粒增强材料和它们的重量分数无关。微观结构观察表明，Al2O3 纳米颗粒分散在不同的区域，包括晶内和晶界区域，而在搅拌摩擦加工过程中，碳纳米管被钉扎在晶界中。从力学角度来看，CNT/Al2O3 的杂化提高了硬度（搅拌区为 126 HV），Al5083/CNT/Al2O3 纳米复合材料的强度（UTS 约为 487 MPa）和耐磨性。这种增强归因于性质不同的 CNT 和 Al2O3 纳米颗粒的存在和特征的组合；一种球形氧化物和一种纳米管。