Microstructural evolution during dry wear test in magnesium and Mg–Y alloy

Wear and Friction Properties of Mg–Zn–Y Alloy with Dispersion of Quasi-Crystalline Phase

“…In magnesium and its alloys, the deformation twins form readily during the plastic deformation due to the lack of slip system. 19) Our previous deformed microstructural observations in the magnesium alloys after the wear test confirmed the twinning formation; 13) however, the present results do not show any existences of twinning. The presence of particles, e.g., quasicrystal phase, within the matrix is reported to play the role of suppressing twinning formation (increasing the twinning stress).…”

“…The friction coefficient of all the alloys shows almost similar; however, the friction coefficient of pure magnesium is reported to be 0.33 under the same wear testing condition. 13) The dispersion of quasicrystal phase is effective to improve the friction properties. On the other hand, the extruded alloy has the largest wear loss rate among all the alloys.…”

“…The microstructural changes are strongly related to the surface temperature, since the temperature at the contact region between the sample and the disk increase during the wear tests. The surface temperature in magnesium and its alloy is reported to be 350400 K, which were obtained through measurements from experiments 20) and estimations 13) under a similar wear testing condition. When a stress was applied to the alloys with fine-grained structures at elevated temperatures, materials softening occurred due to the grain boundary sliding.…”

“…The processing (extrusion) condition to obtain the fine-grained structure (less than 5 µm) is cited from the Refs. 13,16,3036) and is summarized in Table 2. The results of the wear rate under the dry condition with an applied load of less than P = 200 N and a rotation speed of less than v = 1 m/s are also quated from the coarse-grained magnesium and its alloys.…”

Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy

“…Therefore, in recent years, friction and wear of magnesium alloys have gradually become a hot topic in the tribology field. Researchers have found that friction and wear of magnesium and magnesium alloys can be significantly improved by adding rare-earth elements [10,11,12,13,14]. Hidetoshi et al [12] studied the wear of squeezed AZ91 magnesium alloy containing Y and found that a small amount of Al 2 Y phase improved the hardness and thermal stability of the alloy, thus increasing the friction and wear resistances of the alloy.…”