Effect of Ti on the Corrosion Resistance of Al-Cr-Fe-Mn-Mo-Ni Single and Multi-Phase CCAs
Abstract
Five Al0.3Cr0.5Fe2Mn0.25Mo0.15Ni1.5Tix compositionally concentrated alloys were synthesized, forming alloys with an FCC matrix. At Ti concentrations of 5 at. % and above, an L21 phase enriched in Al, Ti and Ni was present within the FCC matrix. At Ti concentrations of 9.6 at. % Ti and above, a three-phase microstructure containing FCC+L21+Laves phases was formed, with the Laves third phases enriched in Cr and Mo. Ti(IV) was a prominent constituent in the passive film. Resistance to localized corrosion improved with Ti concentration before reaching an optimal concentration and beginning to decrease, likely due to the formation of new phases.
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