Effect of Trace Carbon Doping on the Microstructure and Properties of TiZrNbTaMo Refractory High-Entropy Alloys AITranslate

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Chinese Library Classification Number:TG132.32[一般工业技术—材料科学与工程]

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(Ti_42.5Zr_42.5Nb₁₀Ta₅)₉₃Mo₇ refractory high-entropy alloy ingots were prepared using a non-consumable vacuum arc melting furnace.A systematic study was conducted on the effects of 0.05%(mole fraction)carbon doping on the microstructure,mechanical properties and tribological properties over a wide temperature range of the alloy using X-ray diffractometer(XRD),scanning electron microscope(SEM),energy-dispersive spectrometer(EDS),electron backscatter diffractometer(EBSD),electron probe microanalyzer(EPMA),X-ray photoelectron spectrometer(XPS),microhardness tester,room-temperature tensile testing,and high-temperature friction and wear testing.The results show that both the undoped and 0.05%C-doped alloys are composed of a single BCC phase,and trace carbon doping does not lead to the formation of a second phase.Due to the grain boundary segregation effect,trace carbon doping increases the hardness of the alloy from 337.3 HV_0.2to 357.6 HV_0.2,the fracture strength from 693 MPa to 1040 MPa,and the elongation from 1.11%to 25.79%.The wear resistance of the two alloys initially decreases,then increases,and finally decreases again with the rise in test temperature.The wear mechanism transitions from predominant abrasive wear at room temperature to predominant oxidative wear at high temperature(700℃).At different test temperatures,the 0.05%C-doped alloy consistently exhibits better wear resis-tance.