Tribological behaviors of Zr-based bulk metallic glass versus Zr-based bulk metallic glass under relative heavy loads

Environment-Dependent Tribological Properties of Bulk Metallic Glasses

“…Friction behavior was load-dependent in both environments, similar to the trend reported at much higher normal forces by Zhong, et al, [33]. In that case, however, the measured friction coefficients were lower, in the range = 0.15 − 0.21 , and this was attributed to the softening of the surface due to frictional heating (without inducing crystallization).…”

“…Unlike crystalline metals, where strength is often dependent on dislocation nucleation and motion, amorphous metals accommodate plastic deformation by shear banding (inhomogeneous deformation) at lower temperatures and higher strain rates, or by processes like viscous flow (homogeneous deformation) at higher temperatures and lower strain rates [27]. A mechanistic understanding of the strength and deformation of metallic glasses (MGs) remains a topic of active research [3,[31][32][33][34] because of the potential application of these materials in many engineering applications, such as lightweight structural members for automobiles and aircrafts. Here we present an investigation of the tribological properties of metallic glasses, and show that, in the absence of confounding effects from environment and frictional heating, friction coefficients can be directly linked to fundamental mechanisms of deformation.…”

“…This investigation specifically focuses on the friction and wear properties of a commercially-available MG, Zr 44 Cu 10 Ni 10 Ti 11 Be 25 (Vitreloy 1b), similar in composition a n d t h e r m o m e c h a n i c a l p r o p e r t i e s [ 3 5 ] t o Zr 41.2 Ti 13.8 Cu 12.5 Ni 10.0 Be 22.5 (Vitreloy 1) that has been more extensively characterized for a wide range of contact pressures, sliding speeds, counterface materials, and environments [4,5,33,36]. We also attempt to provide insights regarding the origins of the inconsistent tribological properties often reported in the literature for a wide range of MGs.…”

“…We also attempt to provide insights regarding the origins of the inconsistent tribological properties often reported in the literature for a wide range of MGs. Examples include reports on MGs that show high friction (µ > 0.5) [4,7,14,37] and high wear, (K > 10 −4 mm 3 N⋅m ) [6,12,13,16,33,37,38], compared to other reports that show some of the lowest friction coefficients ( ≅ 0.1 − 0.2) [2,3,11,12,33] and wear rates K ≅ 10 −6 mm 3…”

Antimicrobial and wear performance of Cu-Zr-Al metallic glass composites

“…There is also evidence for smearing of material along the sample surface in the track. These features suggest that the material has been subjected to adhesive wear, although abrasive wear also takes place as deduced from the grooved surface similarly to that observed in Zr-based BMGs [49].…”