Tribological and Corrosion Properties of Ni-Cr-Co-Ti-V Multi-Principal Element Alloy Prepared by Vacuum Hot-Pressing Sintering

In our work, an equiatomic Ni-Cr-Co-Ti-V multi-principal element alloy is prepared by vacuum hot-pressing sintering. The phase structure is investigated by Transmission electron microscopy (TEM) and properties of hardness, wear and corrosion resistance are studied. Furthermore, some reported high-entropy alloys (HEAs) and conventional alloys are used as contrast for more intuitive evaluation of properties of Ni-Cr-Co-Ti-V HEA. The average micro-hardness of this alloy reaches 1130 +/- 15 HV. By nano-indentation testing, the value of average Young's modulus and nano-hardness are 318.6 +/- 9 GPa and 17.21 +/- 0.77 GPa, respectively. Compared with the room temperature, this alloy still keeps a good wear resistance at 600 degrees C and adhesive wear is the main wear mechanism. In the 3.5 wt% NaCl electrolyte, the passivating capacity of this alloy is significantly higher than that of 304 stainless steel and the corrosion rate of this alloy is relatively low, approximate to 0.035 mm/year. Thus, this alloy is expected to be applied in the severe interaction work environment of high temperature, wear, and corrosion.