Determination of the Boundaries of Region of Metastable ω-Phase in Titanium and Zirconium Alloys

Abstract

Abstract—The concentration boundary of the formation of the ω-phase in binary titanium alloys with d-metals of 4−11 groups of 4−6 periods were studied by X-ray diffraction analysis. It is established that the ω-phase is formed in all the alloys studied, with the exception of Ti−Zr alloys. It is shown that the minimum concentration limit of the formation of the ω-phase is determined by the position of the curve of the end of the martensitic β → \(\alpha {\kern 1pt} '\)(\(\alpha {\kern 1pt} ''\)) transformation (Mf). For most of the studied titanium alloys, concentrations were determined at which the Ms and Mf points correspond to a temperature of 20°C. The conditions for the formation of the ω-phase in titanium alloys were compared with the conditions for its formation in zirconium alloys.