Effect of TiB2 on the Phase Composition, Microstructure, and Tribological Properties of AlCoCrFeNi/TiB2 Composites

Autor: J. C. Wei, J. G. Kang, B. T. Yang
Rok vydání: 2021
Předmět:
Zdroj: Powder Metallurgy and Metal Ceramics. 59:537-545
ISSN: 1573-9066
1068-1302
Popis: High entropy alloys (HEAs) attract more and more attention due to their simple structure, high strength and hardness, good ductility, and excellent softening, oxidation, corrosion, and wear resistance properties. Among the known HEA systems, the AlCoCrFeNi alloy exhibits complicated microstructure and excellent mechanical properties. In this study, the AlCoCrFeNi/TiB2 composites were prepared via power metallurgy route in combination with spark plasma sintering (SPS) technology. At first, the AlCoCrFeNi HEA powders were prepared by gas-atomization technology under Ar atmosphere with the high purity of raw elemental materials. The commercial TiB2 powders with average particle size of about 2 μm were used as the reinforcing agent to prepare the AlCoCrFeNi/TiB2 composites. The effect of TiB2 content on the phase, microstructure, and tribological properties of the synthesized AlCoCrFeNi/TiB2 composites were investigated by XRD, SEM, and EPMA, whereas also through friction and wear tests. The results show that phase transformation occurs with σ phase formation after sintering. The TiB2 particles tend to agglomerate and grow up with increased TiB2 content. The effect of TiB2 on the tribological behavior of the composites was studied through measuring the coefficient of friction (COF) and wear rate (W). The resulting values of COF and W show that the wear resistance of AlCoCrFeNi/TiB2 composites is improved with increasing the TiB2 content.
Databáze: OpenAIRE
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