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The omega phase in as-cast high-Nb-containing TiAl alloy exhibits particles with sizes on the nano- or microscale within the B2 matrix. Omega particles are transformed from the B2 phase by heterogeneous nucleation on the B2/γ boundaries or homogeneous nucleation within the B2 phase. After annealing at 900°C, the omega particles disappear and transform into B2 phase. The transformation is rapidly initiated,...
An ultrafine-grained surface layer was produced on Mg–Al–Zn alloy by a new severe plastic deformation process, cryogenic burnishing. The total burnishing-influenced zone was found to be over 3.4mm thick. A large increase in hardness from 0.86 to 1.35GPa was obtained near the topmost surface, where grains were refined from 12μm down to 263nm. The corrosion resistance was significantly enhanced, which...
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