MATEC Web Conf.
Volume 321, 2020The 14th World Conference on Titanium (Ti 2019)
|Number of page(s)||6|
|Section||Wrought Processing and Fabrication|
|Published online||12 October 2020|
Phase transformation and evolution of dislocation structure in the β phase of Ti-17 alloy during hot deformation
a Institute for Materials Research, Tohoku University, Sendai, Japan
b Department of Materials and Environmental Engineering, National Institute of Technology, Sendai College, Natori, Japan
c Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, Takamatsu, Japan
The hot deformation behavior and microstructural evolution of Ti–5Al–2Sn–2Zr–4Mo–4Cr (Ti-17) alloy in the β-phase field were examined. Hot compression tests were conducted at temperatures ranging from 700 and 1100 °C and strain rates ranging from 10-3 to 1 s-1. The obtained true stress–true strain curves exhibited steady-state flow behavior at temperatures above the β-transus temperature (Tβ ~ 890 °C). The microstructural observations suggested that the dynamic recovery process represents a dominant mechanism for the β-phase of the alloy. In contrast, the flow softening was identified at 700 °C at a strain rate of 10–3 s–1. The formation of fine acicular α microstructures was noticed in such a deformation condition, indicating that dynamic phase transformation can occur in the metastable β-phase during hot deformation. Such a dynamic phase transformation also occurred preferentially at the initial β-grain boundaries as well as sub-boundaries that created within the βmatrix via dynamic recovery. The β-processing conditions were also examined by constructing processing maps based on the dynamic materials model (DMM).
© The Authors, published by EDP Sciences, 2020
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