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Production, Mechanical and Functional Properties of Long-Length TiNiHf Rods with High-Temperature Shape Memory Effect

In the present work, the possibility of manufacturing long-length TiNiHf rods with a lowered Hf content and a high-temperature shape memory effect in the range of 120–160 °C was studied. Initial ingots with 1.5, 3.0 and 5.0 at.% Hf were obtained by electron beam melting in a copper water-cooled stre...

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Autores principales: Karelin, Roman, Komarov, Victor, Cherkasov, Vladimir, Yusupov, Vladimir, Prokoshkin, Sergey, Andreev, Vladimir
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9865431/
https://www.ncbi.nlm.nih.gov/pubmed/36676351
http://dx.doi.org/10.3390/ma16020615
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author Karelin, Roman
Komarov, Victor
Cherkasov, Vladimir
Yusupov, Vladimir
Prokoshkin, Sergey
Andreev, Vladimir
author_facet Karelin, Roman
Komarov, Victor
Cherkasov, Vladimir
Yusupov, Vladimir
Prokoshkin, Sergey
Andreev, Vladimir
author_sort Karelin, Roman
collection PubMed
description In the present work, the possibility of manufacturing long-length TiNiHf rods with a lowered Hf content and a high-temperature shape memory effect in the range of 120–160 °C was studied. Initial ingots with 1.5, 3.0 and 5.0 at.% Hf were obtained by electron beam melting in a copper water-cooled stream-type mold. The obtained ingots were rotary forged at the temperature of 950 °C, with the relative strain from 5 to 10% per one pass. The obtained results revealed that the ingots with 3.0 and 5.0 at.% Hf demonstrated insufficient technological plasticity, presumably because of the excess precipitation of (Ti,Hf)(2)Ni-type particles. The premature destruction of ingots during the deformation process does not allow obtaining high-quality long-length rods. A long-length rod with a diameter of 3.5 mm and a length of 870 mm was produced by rotary forging from the ingot with 1.5 at.% Hf. The obtained TiNiHf rod had relatively high values of mechanical properties (a dislocation yield stress σ(y) of 800 MPa, ultimate tensile strength σ(B) of 1000 MPa, and elongation to fracture δ of 24%), functional properties (a completely recoverable strain of 5%), and a required finishing temperature of shape recovery of 125 °C in the as-forged state and of 155 °C after post-deformation annealing at 550 °C for 2 h.
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spelling pubmed-98654312023-01-22 Production, Mechanical and Functional Properties of Long-Length TiNiHf Rods with High-Temperature Shape Memory Effect Karelin, Roman Komarov, Victor Cherkasov, Vladimir Yusupov, Vladimir Prokoshkin, Sergey Andreev, Vladimir Materials (Basel) Article In the present work, the possibility of manufacturing long-length TiNiHf rods with a lowered Hf content and a high-temperature shape memory effect in the range of 120–160 °C was studied. Initial ingots with 1.5, 3.0 and 5.0 at.% Hf were obtained by electron beam melting in a copper water-cooled stream-type mold. The obtained ingots were rotary forged at the temperature of 950 °C, with the relative strain from 5 to 10% per one pass. The obtained results revealed that the ingots with 3.0 and 5.0 at.% Hf demonstrated insufficient technological plasticity, presumably because of the excess precipitation of (Ti,Hf)(2)Ni-type particles. The premature destruction of ingots during the deformation process does not allow obtaining high-quality long-length rods. A long-length rod with a diameter of 3.5 mm and a length of 870 mm was produced by rotary forging from the ingot with 1.5 at.% Hf. The obtained TiNiHf rod had relatively high values of mechanical properties (a dislocation yield stress σ(y) of 800 MPa, ultimate tensile strength σ(B) of 1000 MPa, and elongation to fracture δ of 24%), functional properties (a completely recoverable strain of 5%), and a required finishing temperature of shape recovery of 125 °C in the as-forged state and of 155 °C after post-deformation annealing at 550 °C for 2 h. MDPI 2023-01-09 /pmc/articles/PMC9865431/ /pubmed/36676351 http://dx.doi.org/10.3390/ma16020615 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Karelin, Roman
Komarov, Victor
Cherkasov, Vladimir
Yusupov, Vladimir
Prokoshkin, Sergey
Andreev, Vladimir
Production, Mechanical and Functional Properties of Long-Length TiNiHf Rods with High-Temperature Shape Memory Effect
title Production, Mechanical and Functional Properties of Long-Length TiNiHf Rods with High-Temperature Shape Memory Effect
title_full Production, Mechanical and Functional Properties of Long-Length TiNiHf Rods with High-Temperature Shape Memory Effect
title_fullStr Production, Mechanical and Functional Properties of Long-Length TiNiHf Rods with High-Temperature Shape Memory Effect
title_full_unstemmed Production, Mechanical and Functional Properties of Long-Length TiNiHf Rods with High-Temperature Shape Memory Effect
title_short Production, Mechanical and Functional Properties of Long-Length TiNiHf Rods with High-Temperature Shape Memory Effect
title_sort production, mechanical and functional properties of long-length tinihf rods with high-temperature shape memory effect
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9865431/
https://www.ncbi.nlm.nih.gov/pubmed/36676351
http://dx.doi.org/10.3390/ma16020615
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