Structures and corrosion properties of the AlCrFeNiMo _0.50.5 Ti _x xx high entropy alloys

摘要

> The AlCrFeNiMo _0.5 Ti _x ( x ?=?0, 0.25, 0.4, 0.5) high entropy alloys were prepared by copper mold suction casting, and the structures and aqueous corrosion behavior of the alloys were investigated in the present study. It shows that all of these alloys possess BCC?+?B2 structures at various Ti contents, while Ti element is enriched in ordered B2 phase. With increasing Ti content, the passive film becomes more protective. The charge transfer resistance ( R _ct ) value increases from 229?kΩ?·?cm 2 for the AlCrFeNiMo _0.5 alloy to 635?kΩ?·?cm 2 for the AlCrFeNiMo _0.5 Ti _0.5 alloy. Meanwhile, the pitting potential ( E _pit ) increases from 90?mV for the AlCrFeNiMo _0.5 alloy to 410?mV for the AlCrFeNiMo _0.5 Ti _0.5 alloy. The present results indicate that the corrosion resistance of the AlCrFeNiMo _0.5 Ti _x high entropy alloys has been significantly enhanced by Ti additions.