AUTHOR=Peng Chun-Hao , Tsai Che-Wei , Kuo Chia-Ming , Chiu Sheng-Min 

TITLE=High-Temperature Tribological Behavior of Al0.3Cr0.5Fe1.5Mn0.5Ni High-Entropy Alloys With Addition of Titanium and Carbon

JOURNAL=Frontiers in Materials

VOLUME=8

YEAR=2022

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2021.787729

DOI=10.3389/fmats.2021.787729

ISSN=2296-8016

ABSTRACT=<p>In this study, the Al<sub>0.3</sub>Cr<sub>0.5</sub>Fe<sub>1.5</sub>Mn<sub>0.5</sub>Ni high-entropy alloys (HEAs) with addition of titanium and carbon was prepared. The as-cast alloys were composed of FCC solid solution and TiC particles, and were further aged and strengthened by precipitation of B2-NiAl phase at 700°C for 10 h to increase hardness from Hv 200 to Hv 400. Tribological properties of the HEAs and commercial tool steel (AISI M2) against Al<sub>2</sub>O<sub>3</sub> under dry sliding condition at room-temperature and elevated temperatures are compared. After high-temperature wear testing, the HEAs demonstrated exceptional oxidation resistance and a lower friction coefficient than M2 steel since the dense glazed layer on the surface of the HEAs served as a lubricant to decrease the friction coefficient, and protected the substrate from oxidation.</p>