PSI - Issue 47

ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 47 (2023) 849–854

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons Abstract To improve the mechanical properties of the Ti-45 wt.% Nb alloy, severe plastic deformation methods are used for significant refinement of the grain structure. In the ultrafine-grained state, the Ti-45 wt.% Nb alloy has a yield strength of 900 MPa and higher. According to the medical requirements, implants under cyclic loading must have a service life of at least 10 9 cycles. The results of studying the evolution and fracture of the Ti-45 wt.% Nb alloy in the ultrafine-grained state under gigacycle loading are presented. The Ti‑45 wt.% Nb alloy in the ultrafine-grained state demonstrates higher fatigue properties under gigacycle loading. The ultrafine-grained structure in the Ti-45 wt.% Nb alloy is stable under gigacycle loading and provides a service life up to 10 9 or more cycles with higher fatigue strength. Features of the evolution and fracture of the Ti‑45 wt.% Nb alloy under gigacycle loading are discussed. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons Keywords: Ti‑45 wt. % Nb alloy; ultrafine -grained state; fatigue properties; gigacycle loading Abstract To improve the mechanical properties of the Ti-45 wt.% Nb alloy, severe plastic deformation methods are used for significant refinement of the grain structure. In the ultrafine-grained state, the Ti-45 wt.% Nb alloy has a yield strength of 900 MPa and higher. According to the medical requirements, implants under cyclic loading must have a service life of at least 10 9 cycles. The results of studying the evolution and fracture of the Ti-45 wt.% Nb alloy in the ultrafine-grained state under gigacycle loading are presented. The Ti‑45 wt.% Nb alloy in the ultrafine-grained state demonstrates higher fatigue properties under gigacycle loading. The ultrafine-grained structure in the Ti-45 wt.% Nb alloy is stable under gigacycle loading and provides a service life up to 10 9 or more cycles with higher fatigue strength. Features of the evolution and fracture of the Ti‑45 wt.% Nb alloy under gigacycle loading are discussed. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons Keywords: Ti‑45 wt. % Nb alloy; ultrafine -grained state; fatigue properties; gigacycle loading 27th International Conference on Fracture and Structural Integrity (IGF27) Features of the fracture of the Ti – 45 wt.% Nb alloy in ultrafine-grained state at gigacycle fatigue Yurii Sharkeev a,b * , Anna Eroshenko a , Aikol Mairambekova c a Institute of Strength Physics and Materials Science, Siberian Branch Russian Academy of Sciences, 2/4 Akademicheskii, Tomsk, 634055,Russia b National Research Tomsk Polytechnic University, 30 Lenina Av., Tomsk, 634050, Russia c Kyrgyz State Technical University named after I. Razzakov, 66, av. Chinghiz Aitmatov, Bishkek, 720044, Kyrgyzstan 27th International Conference on Fracture and Structural Integrity (IGF27) Features of the fracture of the Ti – 45 wt.% Nb alloy in ultrafine-grained state at gigacycle fatigue Yurii Sharkeev a,b * , Anna Eroshenko a , Aikol Mairambekova c a Institute of Strength Physics and Materials Science, Siberian Branch Russian Academy of Sciences, 2/4 Akademicheskii, Tomsk, 634055,Russia b National Research Tomsk Polytechnic University, 30 Lenina Av., Tomsk, 634050, Russia c Kyrgyz State Technical University named after I. Razzakov, 66, av. Chinghiz Aitmatov, Bishkek, 720044, Kyrgyzstan

* Corresponding author. Tel.: 83822492850; fax:. 83822492576 E-mail address: sharkeev @ ispms.ru * Corresponding author. Tel.: 83822492850; fax:. 83822492576 E-mail address: sharkeev @ ispms.ru

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons 2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons 10.1016/j.prostr.2023.07.034