Funct. Mater. 2022; 29 (1): 81-92.

doi:https://doi.org/10.15407/fm29.01.81

Influence of twist extrusion and thermal action on texturing and properties of titanium

V.V.Usov¹, N.M.Shkatuliak¹, Ye.S.Savchuk¹, N.I.Rybak¹, D.V.Pavlenko², D.V.Tkach², O.M.Khavkina²

¹South Ukrainian National Pedagogical University named after K.Usyinsky, 26 Staroportofrankovskaya Str., 65020 Odesa, Ukraine
²Zaporozhye Polytechnic National University, 64 Zhukovskogo Str, 69063 Zaporozhye, Ukraine

Abstract:

Changes in the elastic modulus, hardness, and ultimate strength of commercially pure titanium (Titanium Grade 2) were studied depending on the direction of severe plastic deformation and subsequent heat treatment of the sample. Severe plastic deformation (SPD) was performed by twist extrusion. Heat treatment was carried out by annealing in the temperature range of 200-400°C with an interval of 50°C. The use of SPD led to the grain refinement to an average size of 200...500 nm from 150...300 μm in the initial state. The change in physical and mechanical properties was associated with the development of a crystallographic texture represented by the Kearns texture parameters, which show the degree of coincidence of the c-axes of the crystalline hexagonal cell of grains with a given geometric direction in a polycrystalline material. The texture of the samples was investigated using the X-ray method by constructing reverse pole figures. It has been shown that the anisotropy of th e elastic modulus after SPD was about 14.0 %. With an increase in the annealing temperature, the anisotropy decreased. After annealing at 250°C, the Kearns texture parameters had the closest values corresponding to the tex ture less state. With a further increase in the annealing temperature, the anisotropy of the elastic modulus increased; after annealing at 400°C its value was 16.42 %. Based on the empirical ratios of hardness and strength of single crystals in titanium of technical purity, the values of the ultimate strength and yield strength of a titanium single crystal along its hexagonal axis and in the direction perpendicular to it were found. The anisotropy coefficients of the ultimate strength and yield streng th of titanium after SPD were determined. The regularity of their change in connection with the temperature of the subsequent annealing was established.

Keywords:

titanium, severe plastic deformation, twist extrusion, heat treatment, crystallographic texture, pole figure, anisotropy, elastic modulus, ultimate strength, hardness.

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Funct. Mater. 2022; 29 (1): 81-92.

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