Abstract
The in situ synthesized TiC/7715D titanium matrix composite has been prepared and its superplasticity has been studied. A maximum elongation of 802% was obtained and different types of true strain–true stress curves were observed. The superplastic average activation energies involved were calculated as 366 and 625 kJ/mol, indicates that the deformation mechanism attributes to mainly dynamic recovery (DR) concurrent with grain boundary sliding (GBS)/grain coarsening (Growth) controlled by grain boundary diffusion and dynamically recrystallization (DRX) predominant concurrent with GBS/Growth controlled by lattice diffusion, respectively. They were verified by microstructures observed by optical microscopy (OM) and transmission electron microscopy (TEM).
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