Abstract
The effect of yttrium on microstructure and mechanical properties of elemental powder metallurgy (EPM) processed TiAl-based alloys was studied. Y-addition, by forming Y 2O 3 through internal oxidation, improved tensile yield strength of TiAl–Mn–Mo–C alloys based on microstructural refinement and precipitation hardening. The tensile ductility of the alloys was also improved moderated by Y-addition, which was attributed to scavenging of oxygen and activation of ordinary 1/2<110] type dislocations. A profuse generation of the dislocations ahead of the crack tip was also confirmed by an in situ TEM experiment. Y-addition did not seriously affect the cracking characteristics of alloys except for the enlarging plastic zone (PZ) size near the crack tip.
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