Physical Mesomechanics. Vol. 27, No. 6, Pages 736-746, 2024

E. V. Naydenkin^a, I. P. Mishin^a^,*, I. V. Ratochka^a, B. B. Straumal^{b, c}, O. V. Zabudchenko^a, O. N. Lykova^a, and A. I. Manisheva^a

^aInstitute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055 Russia

^bOsipyan Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, 142432 Russia

^cNational University of Science and Technology “MISIS”, Moscow, 119049 Russia

Abstract— Comparative studies are conducted on the structure and mechanical properties of the ultrafine-grained Ti-5Al-5V-5Mo-1Cr-1Fe alloy obtained by abc pressing and radial shear rolling with subsequent aging. It is shown that the ultrafine-grained structure formed by these methods provides increased strength properties under both tension and three-point bending compared to the initial coarse-grained state. At the same time, the alloy obtained by abc pressing demonstrates a higher fracture resistance during three-point bending compared to the alloy obtained by radial shear rolling + aging due to its enhanced ductility. This also determines the ductile fracture pattern of the ultrafine-grained alloy obtained by abc pressing during three-point bending in contrast to ductile-brittle fracture of the alloy obtained by radial shear rolling + aging.

Keywords: near β titanium alloy, ultrafine-grained structure, mechanical properties, three-point bending, fracture

Mechanical Properties and Fracture of Ultrafine-Grained Near β Titanium Alloy under Three-Point Bending