Study on Microstructure，Mechanical and Tribological Properties of the Al_xCrFeNi₃Ti_0.3High-Entropy Alloys

Abstract

In order to provide technical support and theoretical support for the application of AlxCrFeNi3Ti0.3high-entropy alloy in the tribological field，the AlxCrFeNi3Ti0.3high-entropy alloys (HEAs) were prepared by arc melting，and the effects of the Al contents on the microstructure，mechanical and tribological properties of the HEAs were investigated by X-ray diffractometer，Vickers hardness tester，friction testing machine，universal testing machine，three-dimensional profilometer，scanning electron microscope，etc.Results showed that the addition of the Al made the microstructure of the HEAs transformed from a single FCC phase to a coexistence of FCC and BCC with dendritic structure.With the increase of the Al content，the density of the HEAs decreased while the hardness，yield strength and compressive strength of the HEAs increased significantly，showing excellent comprehensive mechanical properties.Moreover，the addition of the Al significantly improved the wear resistance of the HEAs，in which the room temperature wear resistance of the Al1.2CrFeNi3Ti0.3HEA increased about 8 times compared with that of the HEA without Al.The wear mechanism of the HEAs changed from abrasive wear to oxidative wear with increasing Al content.Besides，the increase in strength and hardness as well as the formation of the hard oxide layer on the worn surface were the main reasons for the improved wear resistance of the HEAs.

Keywords

• alxcrfeni3ti0.3 high-entropy alloys|microstructure|mechanical properties|tribological properties|wear resistant mechanism