Effects of Mo Content on the Microstructure and Performance of Tinbzrmox High-Entropy Alloys

Abstract

TiNbZrMo x (x=0, 0.3, 0.5, 0.7, 1) high-entropy alloys with different Mo contents were prepared by vacuum arc melting, and the effects of Mo on the phase structure, microstructure, mechanical properties and wear resistance of the alloys were investigated by using X-ray diffractometer (XRD), scanning electron microscope (SEM), universal tensile tester, hardness tester, friction tester and wear tester. The results show that: TiNbZrMo x are in a single BCC phase; with the increase of Mo content, the alloy grain size and wear first decrease and then increase, while the alloy strength and hardness both increase and plasticity both decrease; TiNbZrMo 0.5 has the best comprehensive performance with yield strength of 1.0 GPa, compressive strength of 1.3 GPa and hardness of 429 HV, relative to TiNbZrMo0, increased by 77.32%, 25.14%, and 70.24%, respectively, and its wear rate decreased by 50%, while its plasticity decreased by only 5%.

Keywords: high-entropy alloy, microstructure, Mechanical properties, Processing