Abstract
A transformation pathway during thermal treatment of metastable Ti-15Mo alloy was investigated by in situ neutron diffraction. The evolution of individual phases , , and was investigated during linear heating with two heating rates of 1.9 and 5 and during aging at 450 . The results showed that with a sufficient heating rate (5 in this case), the phase dissolves before the phase forms. On the other hand, for the slower heating rate of 1.9 , a small temperature interval of the coexistence of the and phases was detected. Volume fractions and lattice parameters of all phases were also determined.
Highlights
Metastable β titanium alloys are mostly used in a wide range of components for the aerospace industry and as alternative structural materials for the automotive sector due to their high specific strength and excellent fatigue resistance [1,2]
Due to the metastable nature of the retained β phase, the mechanical properties of metastable β titanium alloys can be tailored through careful control of the microstructure during aging heat treatments
The ω phase forms through consecutive collapse of pairs of {111} β as a result of a soft phonon mode in the β phase, and the particles are compositionally indiscernible from the surrounding matrix [7,8]
Summary
Metastable β titanium alloys are mostly used in a wide range of components for the aerospace industry and as alternative structural materials for the automotive sector due to their high specific strength and excellent fatigue resistance [1,2]. This class of titanium alloys is characterized by its ability to retain the high temperature bcc phase during quenching from above the β transus temperature. Due to the metastable nature of the retained β phase, the mechanical properties of metastable β titanium alloys can be tailored through careful control of the microstructure during aging heat treatments.
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