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Oxidation Behaviour of Microstructurally Highly Metastable Ag-La Alloy

A new silver-based alloy with 2 wt.% of lanthanum (La) was studied as a potential candidate for electric contact material. The alloy was prepared by rapid solidification, performed by the melt spinning technique. Microstructural examination of the rapidly solidified ribbons revealed very fine grains...

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Autores principales: Jug, Andraž, Brunčko, Mihael, Rudolf, Rebeka, Anžel, Ivan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8949107/
https://www.ncbi.nlm.nih.gov/pubmed/35329748
http://dx.doi.org/10.3390/ma15062295
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author Jug, Andraž
Brunčko, Mihael
Rudolf, Rebeka
Anžel, Ivan
author_facet Jug, Andraž
Brunčko, Mihael
Rudolf, Rebeka
Anžel, Ivan
author_sort Jug, Andraž
collection PubMed
description A new silver-based alloy with 2 wt.% of lanthanum (La) was studied as a potential candidate for electric contact material. The alloy was prepared by rapid solidification, performed by the melt spinning technique. Microstructural examination of the rapidly solidified ribbons revealed very fine grains of α(Ag) and intermetallic Ag(5)La particles, which appear in the volume of the grains, as well as on the grain boundaries. Rapid solidification enabled high microstructural refinement and provided a suitable starting microstructure for the subsequent internal oxidation, resulting in fine submicron-sized La(2)O(3) oxide nanoparticle formation throughout the volume of the silver matrix (α(Ag)). The resulting nanostructured Ag-La(2)O(3) microstructure was characterised by high-resolution FESEM and STEM, both equipped with EDX. High-temperature internal oxidation of the rapidly solidified ribbons essentially changed the microstructure. Mostly homogeneously dispersed nano-sized La(2)O(3) were formed within the grains, as well as on the grain boundaries. Three mechanisms of internal oxidation were identified: (i) the oxidation of La from the solid solution; (ii) partial dissolution of finer Ag(5)La particles before the internal oxidation front and oxidation of La from the solid solution; and (iii) direct oxidation of coarser Ag(5)La intermetallic particles.
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spelling pubmed-89491072022-03-26 Oxidation Behaviour of Microstructurally Highly Metastable Ag-La Alloy Jug, Andraž Brunčko, Mihael Rudolf, Rebeka Anžel, Ivan Materials (Basel) Article A new silver-based alloy with 2 wt.% of lanthanum (La) was studied as a potential candidate for electric contact material. The alloy was prepared by rapid solidification, performed by the melt spinning technique. Microstructural examination of the rapidly solidified ribbons revealed very fine grains of α(Ag) and intermetallic Ag(5)La particles, which appear in the volume of the grains, as well as on the grain boundaries. Rapid solidification enabled high microstructural refinement and provided a suitable starting microstructure for the subsequent internal oxidation, resulting in fine submicron-sized La(2)O(3) oxide nanoparticle formation throughout the volume of the silver matrix (α(Ag)). The resulting nanostructured Ag-La(2)O(3) microstructure was characterised by high-resolution FESEM and STEM, both equipped with EDX. High-temperature internal oxidation of the rapidly solidified ribbons essentially changed the microstructure. Mostly homogeneously dispersed nano-sized La(2)O(3) were formed within the grains, as well as on the grain boundaries. Three mechanisms of internal oxidation were identified: (i) the oxidation of La from the solid solution; (ii) partial dissolution of finer Ag(5)La particles before the internal oxidation front and oxidation of La from the solid solution; and (iii) direct oxidation of coarser Ag(5)La intermetallic particles. MDPI 2022-03-20 /pmc/articles/PMC8949107/ /pubmed/35329748 http://dx.doi.org/10.3390/ma15062295 Text en © 2022 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
Jug, Andraž
Brunčko, Mihael
Rudolf, Rebeka
Anžel, Ivan
Oxidation Behaviour of Microstructurally Highly Metastable Ag-La Alloy
title Oxidation Behaviour of Microstructurally Highly Metastable Ag-La Alloy
title_full Oxidation Behaviour of Microstructurally Highly Metastable Ag-La Alloy
title_fullStr Oxidation Behaviour of Microstructurally Highly Metastable Ag-La Alloy
title_full_unstemmed Oxidation Behaviour of Microstructurally Highly Metastable Ag-La Alloy
title_short Oxidation Behaviour of Microstructurally Highly Metastable Ag-La Alloy
title_sort oxidation behaviour of microstructurally highly metastable ag-la alloy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8949107/
https://www.ncbi.nlm.nih.gov/pubmed/35329748
http://dx.doi.org/10.3390/ma15062295
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