Refractory high-entropy alloys are a perspective kind of material for high-temperature

applications due to their excellent mechanical properties as well as the ability to maintain these

properties at high temperatures. Due to the large number of parameters influencing the final

properties of HEA, available literature gives only limited information about the functional properties

of individual alloys.

In this study, refractory high entropy alloy HfNbTaTiZr powder was prepared by the process of

Mechanical Alloying (MA). During the process of mechanical alloying, the powder was doped with

nitrogen for varying times. Powders were further sintered by Spark Plasma Sintering (SPS). Varying

doping times resulted in different nitrogen contents in the final materials. Tribological properties at

high temperatures were tested at room temperature and at a temperature of 800 °C. The influence of

nitrogen content and sintering temperature on friction and wear rate, as well as the wear mechanism,

are discussed.