Tribological Properties and Wear Mechanism of AlCr1.3TiNi2 Eutectic High-Entropy Alloy at Elevated Temperature
Received date: 2021-12-30
Revised date: 2022-04-23
Online published: 2022-06-07
Supported by
National Natural Science Foundation of China(51822402);National Natural Science Foundation of China(U20A20278);National Natural Science Foundation of China(52001051);National Key Research and Development Program of China(2018YFA0702901);National Key Research and Development Program of China(2019YFA0209901);Liaoning Revitalization Talents Program(XLYC1807047);Major Special Project of "Scientific and Technological Innovation 2025" in Ningbo(2019B10086);China Postdoctoral Science Foundation(2021T140082)
Eutectic high-entropy alloys (EHEAs) have been explored as possible options for high-temperature applications due to their controlled microstructure and excellent mechanical properties. In particular, EHEAs possess good liquidity and castability, allowing their possibility for real-size industrial manufacturing. However, despite their importance as a structural material index, the tribological properties were rarely investigated in the EHEAs field. In this study, a kilogram-scale AlCr1.3TiNi2 EHEA was produced using electromagnetic levitation melting and direct casting approach. The EHEA's microstructure and chemical composition were investigated using a TEM and APT techniques. The AlCr1.3TiNi2 EHEA's tribological properties were examined from room temperature to 800oC using a rotational ball-on-disk tribometer (HT-1000). Meanwhile, for comparison, a GH4169 nickel-base superalloy was chosen. The corresponding wear mechanisms were also thoroughly discussed. The findings exhibit that the as-cast AlCr1.3TiNi2 EHEA, which had an ultrafine lamellar structure, consisted of a disordered bcc phase and an ordered L21 phase with lattice misfit of approximately 2%. The average interlamellar spacing was about 350 nm. Additionally, a large number of nanoprecipitates contains in the L21 lamellae central region. Below 600oC, the AlCr1.3TiNi2 EHEA's primary wear mechanism was abrasive wear, and its wear rate was lower than that of the GH4169 alloy. At 800oC, distinct plastic deformation features were observed on the worn surface of EHEA. The EHEA exhibited a much higher friction coefficient than that of the GH4169 alloy at 800oC, but their wear rates were similar. The wear resistance improvement of GH4169 alloy at high temperature was ascribed to the formation of oxide film on its worn surface, and the AlCr1.3TiNi2 EHEA's excellent wear resistance mainly resulted from good structure stability and high hot hardness. Current findings offer new insights into the industrial application of EHEA in high-temperature fields.
Junwei MIAO , Mingliang WANG , Aijun ZHANG , Yiping LU , Tongmin WANG , Tingju LI . Tribological Properties and Wear Mechanism of AlCr1.3TiNi2 Eutectic High-Entropy Alloy at Elevated Temperature[J]. Acta Metall Sin, 2023 , 59(2) : 267 -276 . DOI: 10.11900/0412.1961.2021.00589
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