| 1 | Effects of temperature on the tribological behavior of Al0.25CoCrFeNi high-entropy alloy显示文摘The tribological behavior of Al0.25 CoCrFeNi high-entropy alloy(HEA) sliding against Si3N4 ball was investigated from room temperature to 600°. The microstructure of the alloys was characterized by simple FCC phase with 260 HV. Below 300°, with increasing temperature, the wear rate increased due to high temperature softening. The wear rate remained stabilized above 300°due to the anti-wear effect of the oxidation film on the contact interface. The dominant wear mechanism of HEA changed from abrasive wear at room temperature to delamination wear at 200°, then delamination wear and oxidative wear at 300°and became oxidative above 300°. Moreover, the adhesive wear existed concomitantly below 300°. | L.M.Du L.W.Lan S.Zhu H.J.Yang X.H.Shi P.K.Liaw J.W.Qiao | 2019 | Journal of Materials Science & Technology2019，35，5： | 17 |
| 2 | Effect of environments and normal loads on tribological properties of nitrided Ni(45)(FeCoCr)(40)(AlTi)(15)high-entropy alloys显示文摘The tribological properties of nitrided Ni(45)(FeCoCr)(40)(AlTi)(15)high-entropy alloys(HEAs)were investigated in air and simulated acid rain under different normal loads(5,7,10,and 12 N)at ambient temperature.The results revealed that as-cast HEAs were only composed of FCC phase,while the volume fraction of FCC phase in the nitrided alloys was significantly reduced.Moreover,the hard phases of AIN,CrN,Fe4 N,and TiN phases were formed in the nitrided alloys.The thickness of the nitriding layer was about 8.4μm.The hardness increased from 8.7 GPa in as-cast alloys to 14.5 GPa in the nitrided alloys.In addition,under the same conditions,the friction coefficient of the nitrided alloys was higher than that of as-cast alloys,but the wear rate was generally lower than that of as-cast alloys.Furthermore,the wear rate of the nitrided alloys was the lowest in acid rain due to the lubrication,cleaning,and cooling in the liquid environment.In air,dominating wear mechanisms in as-cast and nitrided alloys were abrasive,delamination,and adhesive wears.And,the wear mechanism of as-cast and nitrided alloys in acid rain was mainly abrasive and corrosion wears. | L.W.Lan X.J.Wang R.P.Guo H.J.Yang J.W.Qiao | 2020 | Journal of Materials Science & Technology2020，42，7： | 4 |
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