Effects of Grain Size, Thickness and Tensile Direction on Ductility of Pure Titanium Sheet

The effects of the thickness (t), grain size (d), ratio t/d, and tensile direction on properties were carefully examined using ASTM grade 1 pure titanium having a strong B texture with controlled (0.2–0.4 mm), (20–175 µm), t/d (2.3–19.4). 0.2%-proof stress followed Hall-Petch relationship in each regardless thickness, this indicates that does not depend t/d. On other hand, strength uniform elongation confirmed to significantly decreased some thin sheets, compared thick sheets same size, except for case tested transverse direction. Namely, both exhibited drastic decrease when becomes smaller than critical values. value depended an increasing angle rolling Local increased decreasing In addition, local was related Tensile are inferred be affected by work-hardening behavior, enhanced twinning deformation hcp titanium. However, formation surface regions found suppressed, presumably due relaxed, constrained conditions. Consequently, rate because attribution from region where is retarded.