Abstract
This study investigated the effect of Si content on the corrosion behavior of AlZrNbTiSix (x=0, 0.3, 0.6, 1.0 at%) lightweight refractory high-entropy alloys in a 1 M HNO3 solution. The results showed a transformation in the microstructures of AlZrNbTiSix from a single BCC phase (x=0) to a BCC matrix phase with Zr5Al3 hexagonal precipitated phases (x=0.3, 0.6, 1.0). AlZrNbTiSi0.6 exhibited the best corrosion resistance, attributed to the addition of Si promoting the growth of continuous and dense oxides. Microgalvanic corrosion affected the formation of the oxide film, triggering an excessive amount of Si worsening the stability of the passive film.
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