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Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses
Salt-fluxing treatment is an effective technique to improve the glass-forming ability (GFA) of bulk metallic glass (BMG)-forming melts, as demonstrated before in Pd- and Fe-based systems. However, it has been challenging to develop similar fluxing protocol for more reactive melts, such as Al-rich BM...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5591232/ https://www.ncbi.nlm.nih.gov/pubmed/28887538 http://dx.doi.org/10.1038/s41598-017-11504-6 |
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author | Yang, B. J. Lu, W. Y. Zhang, J. L. Wang, J. Q. Ma, E. |
author_facet | Yang, B. J. Lu, W. Y. Zhang, J. L. Wang, J. Q. Ma, E. |
author_sort | Yang, B. J. |
collection | PubMed |
description | Salt-fluxing treatment is an effective technique to improve the glass-forming ability (GFA) of bulk metallic glass (BMG)-forming melts, as demonstrated before in Pd- and Fe-based systems. However, it has been challenging to develop similar fluxing protocol for more reactive melts, such as Al-rich BMG-forming systems. Here we design new fluxing agents, from a thermodynamics perspective that takes into account combined effects of physical absorption and chemical absorption (reaction) between the fluxing agents and oxide inclusions. MgCl(2)-CaCl(2) composite salts were selected, and their fluxing effects were systematically studied on an Al(86)Ni(6.75)Co(2.25)Y(3.25)La(1.75) alloy, the best BMG-forming composition reported thus far for Al-rich alloy systems. The oxygen content was found to continuously decrease in the master alloy with increasing cycles of salt-fluxing treatment, with chlorate products on the surface suggesting concurrent physical absorption and chemical reaction. The fluxing treatment developed has enabled a record critical size (diameter) of 2.5 mm for Al-based BMGs. Our finding is thus an advance in developing highly desirable Al-based BMGs, and also provides guidance for designing processing protocol to produce larger-sized BMGs in other reactive systems. |
format | Online Article Text |
id | pubmed-5591232 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-55912322017-09-13 Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses Yang, B. J. Lu, W. Y. Zhang, J. L. Wang, J. Q. Ma, E. Sci Rep Article Salt-fluxing treatment is an effective technique to improve the glass-forming ability (GFA) of bulk metallic glass (BMG)-forming melts, as demonstrated before in Pd- and Fe-based systems. However, it has been challenging to develop similar fluxing protocol for more reactive melts, such as Al-rich BMG-forming systems. Here we design new fluxing agents, from a thermodynamics perspective that takes into account combined effects of physical absorption and chemical absorption (reaction) between the fluxing agents and oxide inclusions. MgCl(2)-CaCl(2) composite salts were selected, and their fluxing effects were systematically studied on an Al(86)Ni(6.75)Co(2.25)Y(3.25)La(1.75) alloy, the best BMG-forming composition reported thus far for Al-rich alloy systems. The oxygen content was found to continuously decrease in the master alloy with increasing cycles of salt-fluxing treatment, with chlorate products on the surface suggesting concurrent physical absorption and chemical reaction. The fluxing treatment developed has enabled a record critical size (diameter) of 2.5 mm for Al-based BMGs. Our finding is thus an advance in developing highly desirable Al-based BMGs, and also provides guidance for designing processing protocol to produce larger-sized BMGs in other reactive systems. Nature Publishing Group UK 2017-09-08 /pmc/articles/PMC5591232/ /pubmed/28887538 http://dx.doi.org/10.1038/s41598-017-11504-6 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Yang, B. J. Lu, W. Y. Zhang, J. L. Wang, J. Q. Ma, E. Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses |
title | Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses |
title_full | Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses |
title_fullStr | Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses |
title_full_unstemmed | Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses |
title_short | Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses |
title_sort | melt fluxing to elevate the forming ability of al-based bulk metallic glasses |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5591232/ https://www.ncbi.nlm.nih.gov/pubmed/28887538 http://dx.doi.org/10.1038/s41598-017-11504-6 |
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