Wear behavior of laminated nanostructured CP-Ti sheets fabricated by severe plastic deformation

Abstract

In this investigation, nanostructured titanium sheets were produced by accumulative roll bonding (ARB). A reciprocating tribometer in a pin-on-flat contact configuration was used to evaluate the wear behavior of ARB-processed sheets. The microstructure of materials was characterized using an optical microscope and transmission electron microscope (TEM). The worn surface was studied by a scanning electron microscope (SEM). A peeling test was used to investigate the bonding strength of clad metal sheets. The results showed that the mean grain size of the material reached 110 nm after 8 ARB cycles. For a sliding distance of 1000 m, the wear weight loss decreased by ∼10% up to the fourth ARB cycle and then increased by ∼80% up to the eighth cycle compared to the raw material. Almost identical changes in the wear resistance were observed under different normal loads. The variation in wear resistance was attributed to the work hardening, grain size, and the layered structure of the material.