Abstract
TiAl alloy added with multilayer graphene (MLG) was prepared by spark plasma sintering (SPS) from 1100 to 1350 °C. The interface reaction products and corresponding reaction mechanisms were analyzed via transmission electron microscope (TEM). It is found that MLG hardly reacts with TiAl below 1150 °C. However, at the temperatures ranging from 1150 to 1250 °C, the interface reaction occurs and the product is mainly characterized as Ti2AlC phase. It is demonstrated that Ti2AlC is directly synthesized by TiAl, Ti3Al, and MLG, rather than the traditional reaction path with the formation of TiC mesophase. With the increase of reaction temperature, Ti3AlC emerges above 1250 °C and eventually replaces Ti2AlC as the primary interface product above 1300 °C. It is revealed that Ti2AlC and Ti3AlC phases formed at the interface are characterized as nano-lamellar structures, which are basically coincident with the original MLG morphology.
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