Abstract
Tribological and mechanical properties of pseudoelastic Ti-51 at. pct Ni alloy were investigated. Particular attention was paid to effects of the pseudoelasticity on wear and friction of the alloy, with comparison to a conventional material—304 stainless steel. Wear and friction tests were performed on a pin-on-disc tribometer under lubricated-sliding and dry-sliding conditions, respectively. Localized wear behavior of the materials and their mechanical properties were also investigated using a triboscope—a combination of a nanomechanical probe and an atomic force microscope. It was demonstrated that the pseudoelasticity of the TiNi alloy was significantly beneficial to its tribological properties. It was observed that the wear resistance of TiNi alloy was two orders of magnitude higher than that of the stainless steel when the alloy behaved pseudoelastically, while this difference in wear resistance decreased to one order of magnitude when the pseudoelasticity deteriorated. It was also demonstrated that the pseudoelasticity strongly influenced the frictional behavior of the alloy.
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