A revised semiempirical approach, considering the average values of the valence electron to atom ratio (e/) and a difference in atomic radii of alloying element/s and the base element (Δ), is proposed to predict the twin formation in titanium alloys.

The revised e/ versus Δ diagram is plotted, considering the reported results of 90 titanium alloys fabricated using various processing methods.

A new twin/slip boundary has been plotted and recommended based on the revised e/ versus Δ diagram.

The conventional maximum limit reported for the twinning in titanium alloys is e/ = 4.20; however, it has been found that twinning in titanium alloys is possible up to the e/ of 4.30.

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