Abstract
Surface mechanical grinding treatment was conducted on a Ti–45Al–7Nb–0.3W intermetallics. The results show that the penetration depth plays an important role in the microstructural evolution. The γ→α2 phase transformation is observed at a penetration depth of 100μm. Nanocrystallized α2 grains (20nm) are found in the treated surface at a penetration depth of 200μm. After the surface mechanical grinding treatment, the micro-hardness of the top surface increases significantly, which is 50% higher than that of the substrate. It is also found that the γ→α2 phase transformation is induced by the localized strain in the surface, while the mechanism for the nanocrystallization is proposed to be the twin–twin intersection.
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