Stress-Induced Twinning and Phase Transformations during the Compression of a Ti-10V-3Fe-3Al Alloy
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Abstract
A metastable β Ti-10V-3Al-3Fe (wt pct) alloy containing different α phase fractions after thermo-mechanical processing was compressed to 0.4 strain. Detailed microstructure evaluation was carried out using high-resolution scanning transmission electron microscopy and electron back-scattering diffraction. Stress-induced β → α′′ and β → ω transformation products together with {332}〈113〉β and {112}〈111〉β twinning systems were simultaneously detected. The effects of β phase stability and strain rate on the preferential activation of these reactions were analyzed. With an increase in β phase stability, stress-induced phase transformations were restricted and {112}〈111〉β twinning was dominant. Alternatively, less stable β conditions or higher strain rates resulted in the dominance of the {332}〈113〉β twinning system and formation of secondary α′′ martensite.
Keywords
Martensite High Strain Rate Deformation Twin Chemical Free Energy Elemental Powder MetallurgyNotes
Acknowledgments
The authors are grateful to Professor O. M. Ivasishin and Dr. D. Savvakin of the Institute for Metal Physics, Ukraine for providing the source material. The financial support of the Engineering Materials Research Strength at UOW is also appreciated. Dr. M. Ahmed acknowledges the support received through Endeavour Research Fellowship programme. This research used equipment funded by the Australian Research Council (LE120100104, LE0237478, and LE0882613).
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