Dispersoid additions and their effect on high temperature deformation of FeAl

Abstract

Small additions of carbon and ZrB 2 have been introduced into an FeAl alloy in order to obtain homogeneous distributions of different dispersoid particles in the B2 matrix. The carbon additions have produced the formation of second phase particles with a complex cubic structure (perovskite). The influence of these particles on the room and high temperature yield strength of the intermetallic has been compared to that of the ZrB 2 particles. Tensile tests of these alloys have been performed between 25°C both types of particles produced a substantial increase, only the ZrB 2 particles retain much of this strength at 600°C. The much faster decrease of stregth with temperature observed in the carbon containing alloy is explained in terms of a deformation process where the perovskite particles constitute a composites material with the matrix deforming at different rates.