Friction and Wear Properties of Al_<i>x</i>CrCuFeNi₂ High-entropy Alloys with Multi-principal-elements

Orthogonal test was carried out with ball-on-disc friction and wear tester in dry, deionized water, and simulated rain water under three loads (5, 10, 15N), respectively. The behavior of two materials at different loads under different environment was compared, the friction and wear properties of the alloys under the simulated service situation was explored. The composition of the samples was examined by X-ray diffraction (XRD). The contour of wear scars was detected by a three-dimensional surface profiler based on scanning white light interferometry. Optical electron microscope is used to observe the structure. The morphology of the worn surfaces were observed by scanning electron microscopy (SEM) and the wear mechanism was analyzed. Results show that due to the increase of Al, the body-centered cubic phase (bcc) substitutes the face-centered cubic (fcc) which attributed to the high hardness of Al_1.3CrCuFeNi₂ leading to good wear property. In dry condition, the wear mechanism are oxidation, adhesion, plastic deformation, and mild abrasive wear while in liquid, the abrasive is dominated along with oxidation and slight adhesive behavior