Isothermal oxidation behavior of scandium and yttrium co-doped B2-type iron-aluminum intermetallics at elevated temperature

摘要

B2 FeAl intermetallic compounds modified with reactive elements(REs) including Sc and Y were fabricated by vacuum arc-melting,and the isothermal oxidation behavior of the RE-doped alloys at 1373 K was investigated.Both Sc and Y single-doping significantly decrease the alumina film growth rate of the alloys.The alumina film growth rate of Sc + Y co-doped alloy even further reduces compared to that of the Sc and Y single-doped alloys.The synergistic effect produced by Sc + Y codoping on the growth behavior of alumina was discussed.It could be anticipated that the combined additions of Sc and Y which have matched chemical properties might decrease the alumina film growth rate more effectively and provide FeAl alloys with enhanced oxidation resistance.