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The AlCrFeNiMo0.5Tix (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 (Rct) value increases from 229 kΩ · cm2 for the AlCrFeNiMo0.5 alloy to 635 kΩ · cm2 for the AlCrFeNiMo0.5Ti0.5 alloy. Meanwhile, the pitting potential (Epit) increases from 90 mV for the AlCrFeNiMo0.5 alloy to 410 mV for the AlCrFeNiMo0.5Ti0.5 alloy. The present results indicate that the corrosion resistance of the AlCrFeNiMo0.5Tix high entropy alloys has been significantly enhanced by Ti additions.

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