Formation the τ-phase during the deformation in a quenching biocompatible Ti–26 at % Nb alloy. effect on properties

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Abstract

In situ X-ray diffraction studies of a hardened Ti–26 at % Nb alloy with an initial single-phase β structure sublected to tension allows studying the processes occurring upon application of deformation and correlating them to three intervals of strain values. The first range of values (up to 0.7%) is the region of elastic deformation of the bcc lattice of the β titanium solid solution. In the second interval (0.7–1.4%), the occurrence of the strain-induced β → τ transformation is recorded, and, as the strain increases to 1.4%, an increase in the c/a parameter of this lattice is observed. In the third strain range (1.4–2.2%), plastic deformation of the β and τ phases occurs. The resulting τ phase after the test remains quite stable. It is found that after tensile tests, the Young modulus of the hardened Ti–6Nb alloy decreases from 58 to 52–54 GPa, and the microhardness increases from 200 to 240 HV.

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About the authors

A. A. Korenev

Ural Federal University named after the First President of Russia B. N. Yeltsin

Email: a.g.illarionov@urfu.ru
Russian Federation, Ekaterinburg, 620002

S. L. Demakov

Ural Federal University named after the First President of Russia B. N. Yeltsin

Email: a.g.illarionov@urfu.ru
Russian Federation, Ekaterinburg, 620002

M. S. Karabanalov

Ural Federal University named after the First President of Russia B. N. Yeltsin

Email: a.g.illarionov@urfu.ru
Russian Federation, Ekaterinburg, 620002

A. G. Illarionov

Ural Federal University named after the First President of Russia B. N. Yeltsin; Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Author for correspondence.
Email: a.g.illarionov@urfu.ru
Russian Federation, Ekaterinburg, 620002; Ekaterinburg, 620108

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Supplementary files

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2. Fig. 1. View of the installation (a); diagram of the X-ray imaging under tension (b).

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3. Fig. 2. Diffraction pattern (a) and orientation microscopy (b) of the quenched Ti–26Nb alloy.

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4. Fig. 3. Experimentally constructed stress-strain diagram for tensile testing of quenched Ti–26Nb alloy (a) and fragments of diffraction patterns of quenched Ti–26Nb alloy, recorded during tensile deformation at certain loading stages ( is the position of the maximum peak of the β-phase lines; ▼ are the τ-phase lines) (b). The recording was carried out from the plane of the cut.

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5. Fig. 4. Lattice periods of the β- and τ-phases (a); parameter c/a of the β- and τ-phases (b) of the Ti–26Nb alloy during tensile testing (the dotted line in “b” shows the transition to values ​​after unloading).

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6. Fig. 5. Fragment of the Bjerstrom nomogram for the tetragonal syngony with the experimental values ​​of c/a plotted on the position of lines with indices of the 200, 211 type of the bct lattice of the τ-phase formed after stretching the quenched Ti–26Nb alloy in the deformation range from 1 to 2.2%.

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7. Fig. 6. Fragment of diffraction patterns (a) and the ratio of the intensities of the lines of the 200 τ- and 200 β-phases of the Ti–26Nb alloy (b) after the first tensile test.

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8. Fig. 7. Alloy structure (a) and orientation microscopy (b) of Ti–26Nb alloy after tensile testing and subsequent aging for 3 days.

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9. Fig. 8. Contour of the graph of the calculated modulus of elasticity (a) and Poisson's ratio (b) of the bcc lattice of the β-solid solution of the Ti–26Nb alloy depending on the orientation.

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