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Interfacial strengthening of β phase in a fully lamellar structure of TiAl alloy containing W

The strengthening of the β phase in two fully lamellar structures with different lamellar spacing of a Ti–48 at.% Al–2 W at.% alloy during creep deformation has been investigated. It was found that the β phase precipitates during aging treatments only within regions of α2 lamellae following their dissolution. The strengthening of the β phase is more effective in the coarser lamellar structure, because the wider β precipitation zones, which replace the prior coarser α2 lamellae, hinders dislocation motion stronger than the narrower ones.