Fe-10Y alloys were prepared by mechanical alloying (MA) and conventional casting (CA) respectively. The hot corrosion behavior of Fe-10Y alloys with a solid Na_2SO_4 deposit was studied in air at 1123 and 1173 K. The results show that hot corrosion rate of MA Fe-10Y alloy was slightly higher than that of CA Fe-10Y alloy. Grain boundaries caused by grain refining act as fast-diffusion paths for the metal ions, oxygen and sulfur in MA alloy and result in the rapid hot corrosion of MA Fe-10Y alloy. Obvious internal oxidation and sulfidation regions were observed, which indicated that internal oxidation and sulfidation cyclic corrosion occurred in MA Fe-10Y alloy. The hot corrosion behavior of MA Fe-10Y alloy coincided with the electrochemistry mechanism model.
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