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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...

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Autores principales: Yao, Longhui, Wang, Liang, Song, Xiaojiao, Cui, Ran, Li, Binqiang, Lv, Qi, Luo, Liangshun, Su, Yanqing, Guo, Jingjie, Fu, Hengzhi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
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.
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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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