Crystallographic Texture and Functional Properties of Powder Titanium Alloys after Thermomechanical Treatment

G. V. Markova; Маркова Г. В.; T. I. Ivankina; Иванкина Т. И.; D. M. Levin; Левин Д. М.; S. S. Volodko; Володько С. С.

doi:10.31857/S1028096023040131

Crystallographic Texture and Functional Properties of Powder Titanium Alloys after Thermomechanical Treatment

Authors: Markova G.V.¹, Ivankina T.I.², Levin D.M.¹, Volodko S.S.¹
Affiliations:
1. Tula State University
2. Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research
Issue: No 4 (2023)
Pages: 90-96
Section: Articles
URL: https://journals.rcsi.science/1028-0960/article/view/137744
DOI: https://doi.org/10.31857/S1028096023040131
EDN: https://elibrary.ru/JPVOBL
ID: 137744

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Abstract

A relationship has been established between the crystallographic texture developed during various thermomechanical treatments and the functional properties of titanium-based alloys, in particular, titanium nickelide obtained by sintering calcium hydride powder. Thermomechanical treatment of sintered workpieces was carried out by rotary forging, radial shear rolling, or extrusion. The temperature of the last stage of deformation in all cases was 900°C. The neutron diffraction analysis of the samples was performed on a texture diffractometer SKAT at JINR (Dubna, Russia). The projection plane of the experimental pole figures was perpendicular to the sample axis and the deformation axis. The shape memory characteristics were determined by torsion deformation on wire samples cut from rods along the axis. The texture is most fully demonstrated by the sample after extrusion: the volume fraction of textured grains reaches 85%, and the maximum pole density is 2.76 m.r.d. (multiple of a random distribution). The functional properties under torsion deformation γ_str = 2–16% are studied. Extruded samples and samples subjected to radial shear rolling demonstrate the best superelasticity in the austenitic phase γ_superеlast = 15% and maximum values of critical stresses γ_cr = 15%, starting from which the deformation becomes irreversible. A relationship between the sharpness of the crystallographic texture and the functional properties of the TiNi alloy after thermomechanical treatment has been revealed.

Keywords

neutron diffraction, shape memory effect, crystallographic texture, superelasticity, powder metallurgy, sintering, rotary forging, radial shear rolling, extrusion, martensite, twinning.

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