Abstract
The oxidation behavior of binary and ternary Fe-Al-Si alloys containing 0–6 at% Al and 0–6 at% Si was investigated at 1073 and 1173 K in 0.04–0.07 and 100 torr of dry oxygen respectively. In combination with silicon, the aluminum content required to form a protective alumina scale was significantly lower than that for binary Fe-Al alloys. The order of increasing oxidation resistance for the alloy compositions examined was: Fe-6Al ≪ Fe-3Al-6Si < Fe-6Si < Fe-1Al-6Si < Fe-5Al-6Si (at 1073 K) or Fe-6Al ≪ Fe-5Si < Fe-6Al-1Si < Fe-4Al-4Si < Fe-1Al-5Si (at 1173 K). There is a synergistic effect of Al and Si in combination on the oxidation properties of the Fe-Al-Si alloys. Si limits the oxidation of Fe during the transient stage of oxidation and increases the activity and outward diffusion flux of Al to the oxide/alloy interface through ternary interactions during the subsequent stage of parabolic oxidation kinetics.
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