Fabrication and mechanical properties of FeAl/TiC composites

1　INTRODUCTIONOver the past few decades, considerable inves tigations have been carried out to identify alterna tive binders for cermets in order to improve theirmechanical properties and also to overcome certainshortcomings, such as high cost and density, lowoxidation and corrosion resistance, and environ mental toxicity[1, 2]. Iron aluminides are of particu lar interest due to their low cost and density, highspecific strength, environmental friendliness andexcellent oxidati…

Fabrication and mechanical properties of FeAl/TiC composites

FeAl/TiC composites were fabricated by reactive hot pressing blended elemental powders.The effects of TiC content,composition of the binder phase and Ni alloying on the densification process and mechanical properties of the composites were studied.The results show that the densities of the composites decrease with the increase of TiC content.Closely related with their porosities and flaw densities,the hardness and bend strength of the composites show peak values with the increase of TiC content.Higher content of Al in the binder phase was beneficial to densification,however it deteriorates the mechanical properties of the composites.The addition of Ni significantly improves the densities of the composites by enhancing matter transfer in the binder phase.By alloying with Ni,the mechanical properties of the composites are greatly improved due to the increase of the density,together with solid solution-strengthening the binder phase and promoting ductile fracture of FeAl.