Abstract
In the present work, using pre-alloyed Ti-48Al-2Cr-2Nb powders and graphene nanosheets as raw materials, the TiAl matrix composite reinforced by submicro/nano-Ti2AlC was fabricated via spark plasma sintering and subsequent heat-treatment. The microstructure characterization results have indicated that submicro-Ti2AlC and nano-Ti2AlC exhibit the coherent atomic correspondence with the full lamellar TiAl matrix. Furthermore, The Ti2AlC/TiAl composite has excellent balance relationship of room-temperature compression strength (∼2171 ± 3 MPa) and fracture strain (∼31 ± 1%). The submicro-Ti2AlC could effectively hinder the twin propagation and inhibit the dislocations motion, which is benefit to improve the strength of the Ti2AlC/TiAl composite. In addition, the nano-Ti2AlC could not only cause the dislocation multiplication in γ-TiAl by the activation of pyramidal dislocations, but also induce the formation of deformation twins in γ-TiAl by the basal-plane slip, resulting in the improvement of plastic deformation capacity in the Ti2AlC/TiAl composite.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call