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Microstructural Features in Multicore Cu–Nb Composites

The study is devoted to heavily drawn multicore Cu–18Nb composites of cylindrical and rectangular shapes. The composites were fabricated by the melt-and-deform method, namely, 600 in situ rods of Cu–18%Nb alloy were assembled in a copper shell and cold-drawn to a diameter of 15.4 mm (e = 10.2) and t...

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Autores principales: Popova, Elena N., Deryagina, Irina L., Valova-Zaharevskaya, Evgeniya G., Ruello, Maria Letizia, Popov, Vladimir V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8618728/
https://www.ncbi.nlm.nih.gov/pubmed/34832429
http://dx.doi.org/10.3390/ma14227033
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author Popova, Elena N.
Deryagina, Irina L.
Valova-Zaharevskaya, Evgeniya G.
Ruello, Maria Letizia
Popov, Vladimir V.
author_facet Popova, Elena N.
Deryagina, Irina L.
Valova-Zaharevskaya, Evgeniya G.
Ruello, Maria Letizia
Popov, Vladimir V.
author_sort Popova, Elena N.
collection PubMed
description The study is devoted to heavily drawn multicore Cu–18Nb composites of cylindrical and rectangular shapes. The composites were fabricated by the melt-and-deform method, namely, 600 in situ rods of Cu–18%Nb alloy were assembled in a copper shell and cold-drawn to a diameter of 15.4 mm (e = 10.2) and then rolled into a rectangular shape the size of 3 × 5.8 mm (e = 12.5). The specimens were analyzed from the viewpoints of their microstructure, microhardness, and thermal stability. The methods of SEM, TEM, X-ray analysis, and microhardness measurements were applied. It is demonstrated that, at higher strain, the fiber texture [Formula: see text] (drawing direction), characteristic of this material, becomes sharper. The distortions of niobium lattice can be observed, namely, the [Formula: see text] interplanar distance is broadened in longitudinal direction of specimens and compacted in transverse sections. The copper matrix lattice is distorted as well, though its distortions are much less pronounced due to its recrystallization. Evolution of microstructure under annealing consists mainly in the coagulation of ribbon-like Nb filaments and in the vanishing of lattice distortions. The structural changes in Nb filaments start at 300–400 °C, then develop actively at 600 °C and cause considerable decrease of strength at 700–800 °C.
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spelling pubmed-86187282021-11-27 Microstructural Features in Multicore Cu–Nb Composites Popova, Elena N. Deryagina, Irina L. Valova-Zaharevskaya, Evgeniya G. Ruello, Maria Letizia Popov, Vladimir V. Materials (Basel) Article The study is devoted to heavily drawn multicore Cu–18Nb composites of cylindrical and rectangular shapes. The composites were fabricated by the melt-and-deform method, namely, 600 in situ rods of Cu–18%Nb alloy were assembled in a copper shell and cold-drawn to a diameter of 15.4 mm (e = 10.2) and then rolled into a rectangular shape the size of 3 × 5.8 mm (e = 12.5). The specimens were analyzed from the viewpoints of their microstructure, microhardness, and thermal stability. The methods of SEM, TEM, X-ray analysis, and microhardness measurements were applied. It is demonstrated that, at higher strain, the fiber texture [Formula: see text] (drawing direction), characteristic of this material, becomes sharper. The distortions of niobium lattice can be observed, namely, the [Formula: see text] interplanar distance is broadened in longitudinal direction of specimens and compacted in transverse sections. The copper matrix lattice is distorted as well, though its distortions are much less pronounced due to its recrystallization. Evolution of microstructure under annealing consists mainly in the coagulation of ribbon-like Nb filaments and in the vanishing of lattice distortions. The structural changes in Nb filaments start at 300–400 °C, then develop actively at 600 °C and cause considerable decrease of strength at 700–800 °C. MDPI 2021-11-19 /pmc/articles/PMC8618728/ /pubmed/34832429 http://dx.doi.org/10.3390/ma14227033 Text en © 2021 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
Popova, Elena N.
Deryagina, Irina L.
Valova-Zaharevskaya, Evgeniya G.
Ruello, Maria Letizia
Popov, Vladimir V.
Microstructural Features in Multicore Cu–Nb Composites
title Microstructural Features in Multicore Cu–Nb Composites
title_full Microstructural Features in Multicore Cu–Nb Composites
title_fullStr Microstructural Features in Multicore Cu–Nb Composites
title_full_unstemmed Microstructural Features in Multicore Cu–Nb Composites
title_short Microstructural Features in Multicore Cu–Nb Composites
title_sort microstructural features in multicore cu–nb composites
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8618728/
https://www.ncbi.nlm.nih.gov/pubmed/34832429
http://dx.doi.org/10.3390/ma14227033
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