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Anomalous strengthening mechanism in HCP Ti

Tsuru, Tomohito   ; Chrzan, D. C.*; Rodney, D.*

The properties of the dislocation/solute interaction are rooted in the electronic structure of the alloy. We explored the origin of anomalous locking mechanism in Ti using first-principles calculations. Stable configurations of a screw dislocation were investigated by stacking fault energy on various slip planes and direct calculations of dislocation in pure Ti. Unlike Zr, a screw dislocation is most stable when they dissociate into pyramidal plane. The Peierls stress for this locking configuration to move on prismatic plane is surprisingly about 800 MPa, which means that Ti has a special strengthening mechanism on its own without any solid solution.

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