Abstract

VNbTa refractory medium-entropy alloy (RMEA) with extraordinary strength-ductility synergy and rolling formability was deemed as an ideal structural material suitable for industrial applications, whereas the tribological performance has been still unclear. Therefore, this work employed a ball-on-disc tribometer to evaluate friction and wear properties of VNbTa alloy at various temperatures. It was surprisingly found that, at 800 degrees C, the alloy exhibits exceptional tribological performance with the coefficient of friction (COF) of 0.13 and wear rate of 3.9 x 10(-6) mm(3 )Nm. Our results indicated that the mild friction and wear at 800 degrees C are mainly attributed to the durable lubrication of in-situ molten V2O5 as well as good load-bearing capacity of hard oxide scale.

Keywords Plus：MECHANICAL-PROPERTIES，MICROSTRUCTURE，BEHAVIOR，STRENGTH，ZR

Published in INTERMETALLICS，Volume 175；10.1016/j.intermet.2024.108497，DEC 2024