Abstract
In this study, the effects of oxygen content on transformation temperatures, microstructures and mechanical properties of Ti-4Zr-xO (wt%) alloys (x = 0, 0.15, 0.20, 0.25 and 0.30) were revealed. It was found that the increase in oxygen content can obviously increase the β-transition temperatures of Ti-4Zr-xO alloys. The microstructure of α phase were transformed from typical basket weave structure into flaky and equiaxed structure. Also, the tensile strength and yield strength of alloys increased obviously by adding oxygen element. In contrast, the elongation presented a decline trend as a whole except Ti-4Zr-0.25O alloy. Among present Ti-4Zr-xO compositions, Ti-4Zr-0.25O exhibited the best comprehensive mechanical properties due to the occurrence of nano-twins.
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