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Effect of Ag on Properties, Microstructure, and Thermostability of Cu–Cr Alloy

Cu–Cr-based alloys exhibit excellent electrical conductivity and strength, but their poor thermal stability limits their application in industry. In this paper, Cu–0.2Cr (at. %) and Cu–0.2Cr–0.12Ag (at. %) alloys were prepared to study the effect of Ag on the properties, microstructure, and thermal...

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Autores principales: Sun, Yuqing, Xu, Gaolei, Feng, Xue, Peng, Lijun, Huang, Guojie, Xie, Haofeng, Mi, Xujun, Liu, Xinhua
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7730119/
https://www.ncbi.nlm.nih.gov/pubmed/33260847
http://dx.doi.org/10.3390/ma13235386
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author Sun, Yuqing
Xu, Gaolei
Feng, Xue
Peng, Lijun
Huang, Guojie
Xie, Haofeng
Mi, Xujun
Liu, Xinhua
author_facet Sun, Yuqing
Xu, Gaolei
Feng, Xue
Peng, Lijun
Huang, Guojie
Xie, Haofeng
Mi, Xujun
Liu, Xinhua
author_sort Sun, Yuqing
collection PubMed
description Cu–Cr-based alloys exhibit excellent electrical conductivity and strength, but their poor thermal stability limits their application in industry. In this paper, Cu–0.2Cr (at. %) and Cu–0.2Cr–0.12Ag (at. %) alloys were prepared to study the effect of Ag on the properties, microstructure, and thermal stability of the Cu–Cr alloy. Microstructure and precipitation were observed by an optical microscope (OM) and a transmission–electron microscope (TEM). After cold-drawing by 99.9% and aging at 450 °C for 2 h, the peak hardness and electric conductivity of the Cu–Cr alloy were 120.3 HV and 99.5% IACS, respectively, and those of the Cu–Cr–Ag alloy were 135.8 HV and 98.3% IACS, respectively. The softening temperature of the Cu–Cr alloy was 500~525 °C, and that of the Cu–Cr–Ag alloy was about 550 °C. The creep strains of the Cu–Cr and Cu–Cr–Ag alloys at 40 MPa and 400 ℃ for 50 h were 0.18% and 0.05%, respectively. Ag elements improved the thermal stability of the Cu–Cr alloy. Recovery and recrystallization occurred before the coarsening of precipitates during the softening process. Ag atoms mainly improved the softening resistance of the alloy by delaying recrystallization, and mainly increased creep resistance by preventing the increase in mobile-dislocation density.
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spelling pubmed-77301192020-12-12 Effect of Ag on Properties, Microstructure, and Thermostability of Cu–Cr Alloy Sun, Yuqing Xu, Gaolei Feng, Xue Peng, Lijun Huang, Guojie Xie, Haofeng Mi, Xujun Liu, Xinhua Materials (Basel) Article Cu–Cr-based alloys exhibit excellent electrical conductivity and strength, but their poor thermal stability limits their application in industry. In this paper, Cu–0.2Cr (at. %) and Cu–0.2Cr–0.12Ag (at. %) alloys were prepared to study the effect of Ag on the properties, microstructure, and thermal stability of the Cu–Cr alloy. Microstructure and precipitation were observed by an optical microscope (OM) and a transmission–electron microscope (TEM). After cold-drawing by 99.9% and aging at 450 °C for 2 h, the peak hardness and electric conductivity of the Cu–Cr alloy were 120.3 HV and 99.5% IACS, respectively, and those of the Cu–Cr–Ag alloy were 135.8 HV and 98.3% IACS, respectively. The softening temperature of the Cu–Cr alloy was 500~525 °C, and that of the Cu–Cr–Ag alloy was about 550 °C. The creep strains of the Cu–Cr and Cu–Cr–Ag alloys at 40 MPa and 400 ℃ for 50 h were 0.18% and 0.05%, respectively. Ag elements improved the thermal stability of the Cu–Cr alloy. Recovery and recrystallization occurred before the coarsening of precipitates during the softening process. Ag atoms mainly improved the softening resistance of the alloy by delaying recrystallization, and mainly increased creep resistance by preventing the increase in mobile-dislocation density. MDPI 2020-11-27 /pmc/articles/PMC7730119/ /pubmed/33260847 http://dx.doi.org/10.3390/ma13235386 Text en © 2020 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Sun, Yuqing
Xu, Gaolei
Feng, Xue
Peng, Lijun
Huang, Guojie
Xie, Haofeng
Mi, Xujun
Liu, Xinhua
Effect of Ag on Properties, Microstructure, and Thermostability of Cu–Cr Alloy
title Effect of Ag on Properties, Microstructure, and Thermostability of Cu–Cr Alloy
title_full Effect of Ag on Properties, Microstructure, and Thermostability of Cu–Cr Alloy
title_fullStr Effect of Ag on Properties, Microstructure, and Thermostability of Cu–Cr Alloy
title_full_unstemmed Effect of Ag on Properties, Microstructure, and Thermostability of Cu–Cr Alloy
title_short Effect of Ag on Properties, Microstructure, and Thermostability of Cu–Cr Alloy
title_sort effect of ag on properties, microstructure, and thermostability of cu–cr alloy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7730119/
https://www.ncbi.nlm.nih.gov/pubmed/33260847
http://dx.doi.org/10.3390/ma13235386
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