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Microstructure Evolution and Toughening Mechanism of a Nb-18Si-5HfC Eutectic Alloy Created by Selective Laser Melting
Because of their superior mechanical performance at ultra-high temperatures, refractory niobium–silicon-based alloys are attractive high-temperature structural alloys, particularly as structural components in gas turbine engines. However, the development of niobium–silicon-based alloys for applicati...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8840692/ https://www.ncbi.nlm.nih.gov/pubmed/35161134 http://dx.doi.org/10.3390/ma15031190 |
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author | Yao, Longhui Wang, Liang Song, Xiaojiao Cui, Ran Li, Binqiang Lv, Qi Luo, Liangshun Su, Yanqing Guo, Jingjie Fu, Hengzhi |
author_facet | Yao, Longhui Wang, Liang Song, Xiaojiao Cui, Ran Li, Binqiang Lv, Qi Luo, Liangshun Su, Yanqing Guo, Jingjie Fu, Hengzhi |
author_sort | Yao, Longhui |
collection | PubMed |
description | Because of their superior mechanical performance at ultra-high temperatures, refractory niobium–silicon-based alloys are attractive high-temperature structural alloys, particularly as structural components in gas turbine engines. However, the development of niobium–silicon-based alloys for applications is limited because of the trade-off between room temperature fracture toughness and high-temperature strength. Here, we report on the fabrication of a Nb-18Si alloy with dispersion of hafnium carbide (HfC) particles through selective laser melting (SLM). XRD and SEM-BSE were used to examine the effects of scanning speed on the microstructure and the phase structure of the deposited Nb-18Si-5HfC alloy. The results show that when the scanning speed rises, the solid solubility of the solid solution improves, the interlamellar spacing of eutectics slowly decrease into nano-scale magnitude, and the corresponding hafnium carbide distribution becomes more uniform. We also discover the hafnium carbide particles dispersion in the inter-lamella structure, which contributes to its high fracture toughness property of 20.7 MPa∙m(1/2) at room temperature. Hardness and fracture toughness are simultaneously improved because of the control of microstructure morphology and carbide distribution. |
format | Online Article Text |
id | pubmed-8840692 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-88406922022-02-13 Microstructure Evolution and Toughening Mechanism of a Nb-18Si-5HfC Eutectic Alloy Created by Selective Laser Melting Yao, Longhui Wang, Liang Song, Xiaojiao Cui, Ran Li, Binqiang Lv, Qi Luo, Liangshun Su, Yanqing Guo, Jingjie Fu, Hengzhi Materials (Basel) Article Because of their superior mechanical performance at ultra-high temperatures, refractory niobium–silicon-based alloys are attractive high-temperature structural alloys, particularly as structural components in gas turbine engines. However, the development of niobium–silicon-based alloys for applications is limited because of the trade-off between room temperature fracture toughness and high-temperature strength. Here, we report on the fabrication of a Nb-18Si alloy with dispersion of hafnium carbide (HfC) particles through selective laser melting (SLM). XRD and SEM-BSE were used to examine the effects of scanning speed on the microstructure and the phase structure of the deposited Nb-18Si-5HfC alloy. The results show that when the scanning speed rises, the solid solubility of the solid solution improves, the interlamellar spacing of eutectics slowly decrease into nano-scale magnitude, and the corresponding hafnium carbide distribution becomes more uniform. We also discover the hafnium carbide particles dispersion in the inter-lamella structure, which contributes to its high fracture toughness property of 20.7 MPa∙m(1/2) at room temperature. Hardness and fracture toughness are simultaneously improved because of the control of microstructure morphology and carbide distribution. MDPI 2022-02-04 /pmc/articles/PMC8840692/ /pubmed/35161134 http://dx.doi.org/10.3390/ma15031190 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 Yao, Longhui Wang, Liang Song, Xiaojiao Cui, Ran Li, Binqiang Lv, Qi Luo, Liangshun Su, Yanqing Guo, Jingjie Fu, Hengzhi Microstructure Evolution and Toughening Mechanism of a Nb-18Si-5HfC Eutectic Alloy Created by Selective Laser Melting |
title | Microstructure Evolution and Toughening Mechanism of a Nb-18Si-5HfC Eutectic Alloy Created by Selective Laser Melting |
title_full | Microstructure Evolution and Toughening Mechanism of a Nb-18Si-5HfC Eutectic Alloy Created by Selective Laser Melting |
title_fullStr | Microstructure Evolution and Toughening Mechanism of a Nb-18Si-5HfC Eutectic Alloy Created by Selective Laser Melting |
title_full_unstemmed | Microstructure Evolution and Toughening Mechanism of a Nb-18Si-5HfC Eutectic Alloy Created by Selective Laser Melting |
title_short | Microstructure Evolution and Toughening Mechanism of a Nb-18Si-5HfC Eutectic Alloy Created by Selective Laser Melting |
title_sort | microstructure evolution and toughening mechanism of a nb-18si-5hfc eutectic alloy created by selective laser melting |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8840692/ https://www.ncbi.nlm.nih.gov/pubmed/35161134 http://dx.doi.org/10.3390/ma15031190 |
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