Friction mechanisms at the micro-scale

On the mechanical and tribological behavior of Al3Mg2 complex metallic alloys as bulk material and as coating

“…8a), while in Case II, the loops were relatively stable. Such corrugations or fluctuations in friction loops were earlier attributed to topography effects, phase effects, and/or wear debris interactions in sliding contacts [33].…”

In situ accelerated micro-wear — A new technique to fill the measurement gap

“…For 200 nm or thinner hard carbon films yield does not occur until the yield pressure of the silicon substrate is exceeded (~12 GPa) and contact below that is essentially elastic [18]. In ramped nano-scratches, or unidirectional repetitive nano-scratching wear testing, of thicker a-C films yield can occur at a lower or higher pressure (8)(9)(10)(11)(12)(13)(14)(15) GPa) depending on the film hardness, though total film failure occurs within only a few cycles of similar or slightly higher pressure. In these low-cycle and high contact pressure tests the mechanism involves crack growth to complete failure during a single ramped scratch or a very low-cycle fatigue process occurring during a few passes at a constant "sub-critical" load (i.e at a load lower than that required to fail the film in a single ramped load scratch).…”

“…Wilson et al focused on C and Cr doped amorphous C films being considered as another solution to tribological issues in MEMS devices and characterised these coatings using modified nanoindenter to carry out micro-wear experiments [8][9][10]. Finally, micro-wear behaviour of DLC and TiN coatings using microtribometer under reciprocating sliding was investigated by Achanta et al, where wear mechanism and third body interaction were discussed using AFM analysis [11,12].…”

Tribocorrosion Study of Ordinary and Laser-Melted Ti6Al4V Alloy

“…These wear mechanisms are often referred to as abrasive, adhesive, delamination, and oxidative [11], not always being independent nor excluding. For example, the subjacent process, such as the accumulation of dislocations, stress concentration in the metal substrate, as well as scale dependence [12][13][14], can be relevant in the determination of the mode of wear on damaged regions [14]. Therefore, these issues increase the natural complexity of tribocorrosion phenomena.…”