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:	Elena N. Popova, Irina L. Deryagina, Evgeniya G. Valova-Zaharevskaya, Maria Letizia Ruello, Vladimir V. Popov
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	multifilamentary Cu–Nb composites microstructure microhardness thermal stability electron microscopy Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/97a2090c237e48929ddcc87c6dffca95
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spelling	oai:doaj.org-article:97a2090c237e48929ddcc87c6dffca952021-11-25T18:15:49ZMicrostructural Features in Multicore Cu–Nb Composites10.3390/ma142270331996-1944https://doaj.org/article/97a2090c237e48929ddcc87c6dffca952021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/7033https://doaj.org/toc/1996-1944The 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 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mfenced close="⟩" open="⟨"><mrow><mn>110</mn></mrow></mfenced><mrow><mi>Nb</mi><mo>∥</mo><mtext> </mtext></mrow><mfenced close="⟩" open="⟨"><mrow><mn>111</mn></mrow></mfenced><mrow><mi>Cu</mi><mo>∥</mo><mtext> </mtext><mi>DD</mi><mtext> </mtext></mrow></mrow></semantics></math></inline-formula>(drawing direction), characteristic of this material, becomes sharper. The distortions of niobium lattice can be observed, namely, the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mfenced close="}" open="{"><mrow><mn>110</mn></mrow></mfenced><msub><mtext> </mtext><mrow><mi>N</mi><mi>b</mi></mrow></msub></mrow></semantics></math></inline-formula> 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.Elena N. PopovaIrina L. DeryaginaEvgeniya G. Valova-ZaharevskayaMaria Letizia RuelloVladimir V. PopovMDPI AGarticlemultifilamentary Cu–Nb compositesmicrostructuremicrohardnessthermal stabilityelectron microscopyTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 7033, p 7033 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	multifilamentary Cu–Nb composites microstructure microhardness thermal stability electron microscopy Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	multifilamentary Cu–Nb composites microstructure microhardness thermal stability electron microscopy Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Elena N. Popova Irina L. Deryagina Evgeniya G. Valova-Zaharevskaya Maria Letizia Ruello Vladimir V. Popov Microstructural Features in Multicore Cu–Nb Composites
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 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mfenced close="⟩" open="⟨"><mrow><mn>110</mn></mrow></mfenced><mrow><mi>Nb</mi><mo>∥</mo><mtext> </mtext></mrow><mfenced close="⟩" open="⟨"><mrow><mn>111</mn></mrow></mfenced><mrow><mi>Cu</mi><mo>∥</mo><mtext> </mtext><mi>DD</mi><mtext> </mtext></mrow></mrow></semantics></math></inline-formula>(drawing direction), characteristic of this material, becomes sharper. The distortions of niobium lattice can be observed, namely, the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mfenced close="}" open="{"><mrow><mn>110</mn></mrow></mfenced><msub><mtext> </mtext><mrow><mi>N</mi><mi>b</mi></mrow></msub></mrow></semantics></math></inline-formula> 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.
format	article
author	Elena N. Popova Irina L. Deryagina Evgeniya G. Valova-Zaharevskaya Maria Letizia Ruello Vladimir V. Popov
author_facet	Elena N. Popova Irina L. Deryagina Evgeniya G. Valova-Zaharevskaya Maria Letizia Ruello Vladimir V. Popov
author_sort	Elena N. Popova
title	Microstructural Features in Multicore Cu–Nb Composites
title_short	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_sort	microstructural features in multicore cu–nb composites
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/97a2090c237e48929ddcc87c6dffca95
work_keys_str_mv	AT elenanpopova microstructuralfeaturesinmulticorecunbcomposites AT irinalderyagina microstructuralfeaturesinmulticorecunbcomposites AT evgeniyagvalovazaharevskaya microstructuralfeaturesinmulticorecunbcomposites AT marialetiziaruello microstructuralfeaturesinmulticorecunbcomposites AT vladimirvpopov microstructuralfeaturesinmulticorecunbcomposites
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Microstructural Features in Multicore Cu–Nb Composites

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