Abstract
In this study, the Al0.3Cr0.5Fe1.5Mn0.5Ni 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 Al2O3 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.
Highlights
IntroductionThe demand for industrial machinery in extreme environments has been increasing
In recent years, the demand for industrial machinery in extreme environments has been increasing
The composition of the matrix was designed based on the statistics of the related parameters such as valence electron concentration (VEC), δ, and Ω to predict the phase simulation since TiC would not dissolve in the matrix
Summary
The demand for industrial machinery in extreme environments has been increasing. Oxidation resistance is concerned with high-temperature wear since an oxide layer might form on the surface and help to decrease the friction coefficient (Stott, 1998; Aoh and Chen, 2001). Several studies have been conducted on the tribological performance of traditional alloys at elevated temperatures (Birol, 2010; Inman and Datta, 2011; Cheng et al, 2017; Khajuria and Wani, 2017); the mechanism of glazed layer has been well-researched (Stott et al, 1973; Stott, 1998; Jiang et al, 2004). The main objective of the present work is to investigate the tribological behavior of high-entropy alloys (HEAs) at elevated temperatures
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