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Phase transformations in several metastable β-titanium alloys were studied during linear heating by in-situ electrical resistance measurement. The initial decrease of electrical resistance is caused by a reverse shuffle transformation of athermal ω phase particles to β matrix. The following temperature interval in which a negative dependence of electrical resistance was observed correlates with diffusional stabilization and growth of isothermal ω phase which releases internal stresses in the β matrix. At the temperature of ω phase stability limit (500 – 570 °C, depending on the type of alloy), an abrupt change in electrical resistance is observed. The subsequent β → α followed by α → β transformation may cause an additional local maximum in the electrical resistance, depending on the type of the studied alloy and the kinetics of this transition. Electrical resistance measurement proved to be a very sensitive technique for phase transformation analysis.
Keywords: Metastable beta-Ti alloys, omega phase, electrical resistivity© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.