Stress-Induced Twinning and Phase Transformations during the Compression of a Ti-10V-3Fe-3Al Alloy

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2017-06, Vol.48 (6), p.2791-2800
• Main Authors: Ahmed, Mansur, Gazder, Azdiar A., Saleh, Ahmed A., Wexler, David, Pereloma, Elena V.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Deformation; Dominance; Ductility; Materials Science; Mechanical properties; Metallic Materials; Metallurgy; Nanotechnology; Phase stability; Phase transformations; Physical metallurgy; Powder metallurgy; Strain hardening; Strain rate; Structural Materials; Surfaces and Interfaces; Symposium: PTM 2015: Solid-Solid Phase Transformations in Inorganic Materials; Thin Films; Titanium alloys; Titanium base alloys; Transmission electron microscopy; Twinning
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-016-3675-4

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.