Abstract
Thermal deformation nowadays is a general fabrication method for Titanium-Aluminum alloy, which could enhance the mechanical properties due to the refining of grain size and lamellar colonies combined with the deformation induced nanotwins. Compared with thermal deformation method, here we report a casting strategy which realizes the ideal refining, nanotwinning combined with efficient strengthening and toughening in a Ti3Al matrix alloy. Average lamellas width are refined from about 3.3μm to about 37nm. Samples exhibit an ultimate compressive strength of 2.76GPa with a strain about 17.3%. SiC-Nb4C3 core-shell structure was observed in the interface between reinforcement and matrix. Nanotwins of {0002}α2-Ti3Al in the diphasic interface exhibit an unusual three-dimensional morphology, which is related to the deformation of TiAl phase and the incomplete phase transition.
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