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Effect of Mn Addition on the Microstructures and Mechanical Properties of CoCrFeNiPd High Entropy Alloy

CoCrFeNiPdMn(x) (x = 0, 0.2, 0.4, 0.6, 0.8) high entropy alloys (HEAs) were prepared and characterized. With an increase in Mn addition, the microstructures changed from dendrites (CoCrFeNiPd with a single face-centered-cubic (FCC) phase) to divorced eutectics (CoCrFeNiPdMn(0.2) and CoCrFeNiPdMn(0.4...

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Autores principales: Tan, Yiming, Li, Jinshan, Wang, Jun, Kou, Hongchao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7514768/
https://www.ncbi.nlm.nih.gov/pubmed/33267003
http://dx.doi.org/10.3390/e21030288
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author Tan, Yiming
Li, Jinshan
Wang, Jun
Kou, Hongchao
author_facet Tan, Yiming
Li, Jinshan
Wang, Jun
Kou, Hongchao
author_sort Tan, Yiming
collection PubMed
description CoCrFeNiPdMn(x) (x = 0, 0.2, 0.4, 0.6, 0.8) high entropy alloys (HEAs) were prepared and characterized. With an increase in Mn addition, the microstructures changed from dendrites (CoCrFeNiPd with a single face-centered-cubic (FCC) phase) to divorced eutectics (CoCrFeNiPdMn(0.2) and CoCrFeNiPdMn(0.4)), to hypoeutectic microstructures (CoCrFeNiPdMn(0.6)), and finally to seaweed eutectic dendrites (CoCrFeNiPdMn(0.8)). The addition of Mn might change the interface energy anisotropy of both the FCC/liquid and MnPd-rich intermetallic compound/liquid interfaces, thus forming the seaweed eutectic dendrites. The hardness of the FCC phase was found to be highly related to the solute strengthening effect, the formation of nanotwins and the transition from CoCrFeNiPd-rich to CoCrFeNi-rich FCC phase. Hierarchical nanotwins were found in the MnPd-rich intermetallic compound and a decrease in either the spacing of primary twins or secondary twins led to an increase in hardness. The designing rules of EHEAs were discussed and the pseudo binary method was revised accordingly.
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spelling pubmed-75147682020-11-09 Effect of Mn Addition on the Microstructures and Mechanical Properties of CoCrFeNiPd High Entropy Alloy Tan, Yiming Li, Jinshan Wang, Jun Kou, Hongchao Entropy (Basel) Article CoCrFeNiPdMn(x) (x = 0, 0.2, 0.4, 0.6, 0.8) high entropy alloys (HEAs) were prepared and characterized. With an increase in Mn addition, the microstructures changed from dendrites (CoCrFeNiPd with a single face-centered-cubic (FCC) phase) to divorced eutectics (CoCrFeNiPdMn(0.2) and CoCrFeNiPdMn(0.4)), to hypoeutectic microstructures (CoCrFeNiPdMn(0.6)), and finally to seaweed eutectic dendrites (CoCrFeNiPdMn(0.8)). The addition of Mn might change the interface energy anisotropy of both the FCC/liquid and MnPd-rich intermetallic compound/liquid interfaces, thus forming the seaweed eutectic dendrites. The hardness of the FCC phase was found to be highly related to the solute strengthening effect, the formation of nanotwins and the transition from CoCrFeNiPd-rich to CoCrFeNi-rich FCC phase. Hierarchical nanotwins were found in the MnPd-rich intermetallic compound and a decrease in either the spacing of primary twins or secondary twins led to an increase in hardness. The designing rules of EHEAs were discussed and the pseudo binary method was revised accordingly. MDPI 2019-03-16 /pmc/articles/PMC7514768/ /pubmed/33267003 http://dx.doi.org/10.3390/e21030288 Text en © 2019 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Tan, Yiming
Li, Jinshan
Wang, Jun
Kou, Hongchao
Effect of Mn Addition on the Microstructures and Mechanical Properties of CoCrFeNiPd High Entropy Alloy
title Effect of Mn Addition on the Microstructures and Mechanical Properties of CoCrFeNiPd High Entropy Alloy
title_full Effect of Mn Addition on the Microstructures and Mechanical Properties of CoCrFeNiPd High Entropy Alloy
title_fullStr Effect of Mn Addition on the Microstructures and Mechanical Properties of CoCrFeNiPd High Entropy Alloy
title_full_unstemmed Effect of Mn Addition on the Microstructures and Mechanical Properties of CoCrFeNiPd High Entropy Alloy
title_short Effect of Mn Addition on the Microstructures and Mechanical Properties of CoCrFeNiPd High Entropy Alloy
title_sort effect of mn addition on the microstructures and mechanical properties of cocrfenipd high entropy alloy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7514768/
https://www.ncbi.nlm.nih.gov/pubmed/33267003
http://dx.doi.org/10.3390/e21030288
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