Effect of La2O3 on microstructure and high-temperature wear property of hot-press sintering FeAl intermetallic compound

FeAl intermetallic compound with different contents of rare earth oxide La2O3 addition was prepared by hot pressing the mechanically alloyed powders. Effect of La2O3 on microstructure and high-temperature wear property of the sintered FeAl samples was investigated in this paper. The results showed that 1 wt.% La2O3 addition could refine the microstructure and increase the density of the FeAl intermetallic compound, and correspondingly improved the high-temperature wear resistance. SEM and EDS analyses of the worn surface indicated that micro-ploughing and local melting combined with oxidation were the dominant wear mechanisms.