Abstract
This work shows the formation of the athermal ω phase in alloy Ti–4 wt% Fe. The alloy under study, heat treated at 800 °C for 100 h and subsequently water quenched, is investigated using X‐ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The thermal stability of ω‐Ti(Fe) is investigated by differential scanning calorimetry (DSC). The DSC measurements show a cascade of several thermic events between 160 and 450 °C, and one strong and sharp exothermic DSC peak at ∼480 °C. The phase transformations and other microstructural changes behind these events are explained by complementary use of XRD, electron backscatter diffraction (EBSD), and TEM analyses that are performed on samples heated stepwise in the DSC apparatus. These experiments indicate that the embryos of athermal ω‐Ti(Fe) grow up to ∼400 °C and start to decompose into an α‐Ti(Fe) + β assemblage already at 450 °C. At ∼480 °C, the decomposition of the athermal ω‐Ti(Fe) phase is practically finished. Thermal stability of athermal ω‐Ti(Fe) is compared with the thermal stability of ω‐Ti(Fe) produced in a high‐pressure torsion (HPT) process, indicating a higher thermal stability of ω‐Ti(Fe) in the non‐deformed alloys.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
