Tribological Properties of Al2024-2wt.%TiO_2 Nanocomposite Produced by Mechanical Alloying and Hot-Pressing

Aluminum matrix composites have recently gained increased attention for structural applications in many industries due to their excellent properties. in this research, machining scraps of coarse- grained al2024-t3 alloy were used to prepare nanostructured al2024 alloy and al2024-2wt.%tio_2 nanocomposite. then, tribological behavior of bulk nanostructured al2024 alloy and al2024-2wt.%tio_2 nanocomposite, produced by 10 h of mechanical alloying and subsequent hot-pressing at 500 °c for 20 min, was investigated. hardness measurements on the samples revealed that the hardness value of mechanically alloyed and hot-pressed al2024 alloy reached a value of ~ 198 hv, which was ~ 41% higher than that for the initial coarse-grained al2024-t3 alloy (140 hv). the average hardness values of al2024-2wt.%tio_2 nanocomposite was found to be 238 hv, which showed ~ 20% increase compared with that for the nanostructured al2024 alloy. the wear resistance of samples changed in the order of coarse-grained al2024 alloy