Structural-phase state and mechanical properties of β titanium alloy produced by rotary swaging with subsequent aging

• Published in: Journal of alloys and compounds 2023-02, Vol.935, p.167973, Article 167973
• Main Authors: Naydenkin, E.V., Mishin, I.P., Zabudchenko, O.V., Lykova, O.N., Manisheva, A.I.
• Format: Article
• Language: English
• Subjects: Mechanical properties; Rotary swaging; Structural-phase state; β titanium alloy
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.167973

The structure and phase composition of β titanium alloy Ti-15V-3Cr-3Al-3Sn-1Zr-1Mo processed by rotary swaging with subsequent aging was studied using the methods of EBSD, scanning and transmission electron microscopy, and X-ray diffraction analysis. It was found that the treatment leads to the decomposition of deformed supersaturated β solid with the precipitation of a lamellar α/α" phase with a volume fraction of up to 20% and the thickness range from 7 to 35nm depending on the aging temperature. The study of mechanical properties showed that rotary swaging at 800 °C and subsequent aging at a temperature of 420 °C for 10h leads to an almost twofold increase in the ultimate strength of the alloy from 800 to 1550MPa while maintaining satisfactory ductility (∼ 4%). An increase in the aging temperature to 450 °C leads to a decrease in the strength characteristics of the alloy due to the coagulation of α/α"-phase precipitates and a decrease of internal stresses in the β phase. The results obtained create good prerequisites for the application of the treated alloy, including in aerospace industry. •Rotary swaging with subsequent aging was applied for β titanium alloy for the first time.•The treatment leads to decomposition of β solid with α/α" lamellar varied from 7 to 35nm.•RS + aging at 420 °C, 10h leads to an almost twofold increase in alloy ultimate strength.