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Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation
MoSiBTiC alloys are promising candidates for next-generation ultrahigh-temperature materials. However, the phase diagram of these alloys has been unknown. We have developed an ultrahigh-temperature thermal analyser based on blackbody radiation that can be used to analyse the melting and solidificati...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6803764/ https://www.ncbi.nlm.nih.gov/pubmed/31636372 http://dx.doi.org/10.1038/s41598-019-50945-z |
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author | Fukuyama, Hiroyuki Sawada, Ryogo Nakashima, Haruki Ohtsuka, Makoto Yoshimi, Kyosuke |
author_facet | Fukuyama, Hiroyuki Sawada, Ryogo Nakashima, Haruki Ohtsuka, Makoto Yoshimi, Kyosuke |
author_sort | Fukuyama, Hiroyuki |
collection | PubMed |
description | MoSiBTiC alloys are promising candidates for next-generation ultrahigh-temperature materials. However, the phase diagram of these alloys has been unknown. We have developed an ultrahigh-temperature thermal analyser based on blackbody radiation that can be used to analyse the melting and solidification of the alloy 67.5Mo–5Si–10B–8.75Ti–8.75 C (mol%). Furthermore, electromagnetic levitation (EML) was used for in-situ observation of solidification and microstructural study of the alloy. On the basis of the results, the following solidification pathway is proposed: Mo solid solution (Mo(ss)) begins to crystallize out as a primary phase at 1955 °C (2228 K) from a liquid state, which is followed by a (Mo(ss)+TiC) eutectic reaction starting at 1900 °C (2173 K). Molybdenum boride (Mo(2)B) phase precipitates from the liquid after the eutectic reaction; however, the Mo(2)B phase may react with the remaining liquid to form Mo(ss) and Mo(5)SiB(2) (T(2)) as solidification proceeds. In addition, T(2) also precipitates as a single phase from the liquid. The remaining liquid reaches the (Mo(ss) + T(2) + TiC) ternary eutectic point at 1880 °C (2153 K), and the (Mo(ss) + T(2) + Mo(2)C) eutectic reaction finally occurs at 1720 °C (1993 K). This completes the solidification of the MoSiBTiC alloy. |
format | Online Article Text |
id | pubmed-6803764 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-68037642019-10-24 Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation Fukuyama, Hiroyuki Sawada, Ryogo Nakashima, Haruki Ohtsuka, Makoto Yoshimi, Kyosuke Sci Rep Article MoSiBTiC alloys are promising candidates for next-generation ultrahigh-temperature materials. However, the phase diagram of these alloys has been unknown. We have developed an ultrahigh-temperature thermal analyser based on blackbody radiation that can be used to analyse the melting and solidification of the alloy 67.5Mo–5Si–10B–8.75Ti–8.75 C (mol%). Furthermore, electromagnetic levitation (EML) was used for in-situ observation of solidification and microstructural study of the alloy. On the basis of the results, the following solidification pathway is proposed: Mo solid solution (Mo(ss)) begins to crystallize out as a primary phase at 1955 °C (2228 K) from a liquid state, which is followed by a (Mo(ss)+TiC) eutectic reaction starting at 1900 °C (2173 K). Molybdenum boride (Mo(2)B) phase precipitates from the liquid after the eutectic reaction; however, the Mo(2)B phase may react with the remaining liquid to form Mo(ss) and Mo(5)SiB(2) (T(2)) as solidification proceeds. In addition, T(2) also precipitates as a single phase from the liquid. The remaining liquid reaches the (Mo(ss) + T(2) + TiC) ternary eutectic point at 1880 °C (2153 K), and the (Mo(ss) + T(2) + Mo(2)C) eutectic reaction finally occurs at 1720 °C (1993 K). This completes the solidification of the MoSiBTiC alloy. Nature Publishing Group UK 2019-10-21 /pmc/articles/PMC6803764/ /pubmed/31636372 http://dx.doi.org/10.1038/s41598-019-50945-z Text en © The Author(s) 2019 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 Fukuyama, Hiroyuki Sawada, Ryogo Nakashima, Haruki Ohtsuka, Makoto Yoshimi, Kyosuke Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation |
title | Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation |
title_full | Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation |
title_fullStr | Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation |
title_full_unstemmed | Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation |
title_short | Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation |
title_sort | study of solidification pathway of a mosibtic alloy by optical thermal analysis and in-situ observation with electromagnetic levitation |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6803764/ https://www.ncbi.nlm.nih.gov/pubmed/31636372 http://dx.doi.org/10.1038/s41598-019-50945-z |
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