Abstract
As-rolled and annealed microstructures of Zr-free and Zr-containing (2 and 10 wt. % Zr) αTi alloys have been evaluated by optical microscopy and analytical transmission electron microscopy. In the as-rolled samples, grain refinement by the Zr addition is accomplished, and 0.2% proof stress of 833 MPa in the 10Zr alloy is obtained. The mechanical properties are enhanced as the Zr content increases. When annealing is applied to the as-rolled samples at 750 °C, then rapid grain growth of recrystallized grains occurs in the Zr-free alloy. However, it is found that the grain growth is sufficiently suppressed by the Zr addition due to a solute drag effect, and this is obvious when the Zr content increases. The grain refinement by the Zr addition leads to high strength in the Zr-containing alloys as similar to the as-rolled samples following the Hall-Petch rule.
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