Abstract:The microstructures and mechanical properties of the TiAl +xCe (x=0.002, 0.005,
0.010, 0.015, 0.020, mole fraction) alloys in annealing condition were investigated. The results showed that the strength and deflection of the TiAl alloys were obviously enhanced by adding a small amount of Ce (e.g 0.002 mole fraction). The analyses show that this improvement was due to the refinement of microstructures and the reduction of the oxygen content in the matrix caused by Ce. However excessive Ce would result in forming coarse particles and a lot of pores, thus lowering the mechanical properties.

Key words: Ce　TiAl alloy　mechanical properties　microstructures