Abstract
The aim of this investigation was to study the effect of hydrogen treatment on the tensile and impact properties of α+β-type titanium alloys. The results were as follows: it was found that mesoscopic-grained Ti–6Al–4V alloys with grain size 1–3 μm had high ductility together with high strength. In particular, it showed an extremely large uniform elongation. The yield stress of these alloys with grain sizes 1–3 μm increased linearly in proportion to the −1/2 power of grain size. Very fine voids were observed directly below the fractured surface of tensile specimens with mesoscopic structures. The microstructures of highly deformed alloys with mesoscopic structures indicated that a fine β(bcc)-phase was dispersed along the boundaries of equiaxed α(hcp) grains which were preferentially deformed, similar to the grain-boundary-sliding phenomenon of superplasticity. The impact test indicated that the toughness of the mesoscopic-grained alloys was comparatively low.
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