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Pure Ti consisting of 90 mass% ω-phase with a grain size of a few hundred nanometers and a Vickers microhardness of H v 3.7GPa is produced by high-pressure torsion straining under 5GPa with an equivalent strain of >100 at 0.2rpm at room temperature. The stabilization of ω-phase at ambient condition occurs via the application of shear deformation in the ω-phase state, and the fraction of...