Hot deformation behavior of Ti-Al-Sn-Zr-Mo alloy

Abstract In the first part of this research Ti-Al-Sn-Zr-Mo alloy compression tests were performed on Gleeble 3800 thermomechanical simulator, in order to characterize the material behavior under various temperature-strain-strain rate conditions. The tests were carried out at strain rates from 0.01 to 100 s-1, and at the temperatures of 800, 900, 950, 1000, and 1100 °C, to a true strain of 1. The data obtained from the compression tests were converted into true stress – true strain curves. Based on the stress-strain curves, the constitutive equation describing the flow behavior of the investigated alloy for all stress levels in the hot deformation process was developed as Arrhenius-type equation. The deformation activation energy and material constants for constitutive equation developed for the investigated Ti-Al-Sn-Zr-Mo alloy were calculated. The distribution of the Zener-Hollomon parameter in dependence on the flow stress values was close to linear, with high linear regression correlation coefficient, what confirmed the accuracy of developed constitutive equation describing the behavior of the Ti-Al-Sn-Zr-Mo alloy during hot forming. The distribution of deformation activation energy at different deformation temperatures and strain rates, supporting better understanding of the microstructural changes during deformation, was also elaborated. The obtained results allowed better understanding of the deformation mechanisms in Ti-Al-Sn-Zr-Mo alloy during hot working.