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Microstructural Study of CrNiCoFeMn High Entropy Alloy Obtained by Selective Laser Melting

The high entropy alloy (HEA) of equiatomic composition CrNiFeCoMn and with FCC crystal structure was additively manufactured in a selective laser melting (SLM) process starting from mechanically alloyed powders. The as-produced alloy shows fine nitride and σ phase precipitates, which are Cr-rich and...

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Autores principales: Campari, Enrico Gianfranco, Casagrande, Angelo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9414008/
https://www.ncbi.nlm.nih.gov/pubmed/36013680
http://dx.doi.org/10.3390/ma15165544
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author Campari, Enrico Gianfranco
Casagrande, Angelo
author_facet Campari, Enrico Gianfranco
Casagrande, Angelo
author_sort Campari, Enrico Gianfranco
collection PubMed
description The high entropy alloy (HEA) of equiatomic composition CrNiFeCoMn and with FCC crystal structure was additively manufactured in a selective laser melting (SLM) process starting from mechanically alloyed powders. The as-produced alloy shows fine nitride and σ phase precipitates, which are Cr-rich and stable up to about 900 K. The precipitates increase in number and dimensions after long-period annealing at 900–1300 K, with a change in the HEA mechanical properties. Higher aging temperatures in the furnace, above 1300 K, turn the alloy into a single FCC structure, with the disappearance of the nitride and σ phase precipitates inside the grains and at the grain boundaries, but still with the presence of a finer Cr-rich nitride precipitation phase. These results suggest that the as-produced HEA is a supersaturated solid solution at low and intermediate temperature with nitrides and σ nanostructures.
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spelling pubmed-94140082022-08-27 Microstructural Study of CrNiCoFeMn High Entropy Alloy Obtained by Selective Laser Melting Campari, Enrico Gianfranco Casagrande, Angelo Materials (Basel) Article The high entropy alloy (HEA) of equiatomic composition CrNiFeCoMn and with FCC crystal structure was additively manufactured in a selective laser melting (SLM) process starting from mechanically alloyed powders. The as-produced alloy shows fine nitride and σ phase precipitates, which are Cr-rich and stable up to about 900 K. The precipitates increase in number and dimensions after long-period annealing at 900–1300 K, with a change in the HEA mechanical properties. Higher aging temperatures in the furnace, above 1300 K, turn the alloy into a single FCC structure, with the disappearance of the nitride and σ phase precipitates inside the grains and at the grain boundaries, but still with the presence of a finer Cr-rich nitride precipitation phase. These results suggest that the as-produced HEA is a supersaturated solid solution at low and intermediate temperature with nitrides and σ nanostructures. MDPI 2022-08-12 /pmc/articles/PMC9414008/ /pubmed/36013680 http://dx.doi.org/10.3390/ma15165544 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
Campari, Enrico Gianfranco
Casagrande, Angelo
Microstructural Study of CrNiCoFeMn High Entropy Alloy Obtained by Selective Laser Melting
title Microstructural Study of CrNiCoFeMn High Entropy Alloy Obtained by Selective Laser Melting
title_full Microstructural Study of CrNiCoFeMn High Entropy Alloy Obtained by Selective Laser Melting
title_fullStr Microstructural Study of CrNiCoFeMn High Entropy Alloy Obtained by Selective Laser Melting
title_full_unstemmed Microstructural Study of CrNiCoFeMn High Entropy Alloy Obtained by Selective Laser Melting
title_short Microstructural Study of CrNiCoFeMn High Entropy Alloy Obtained by Selective Laser Melting
title_sort microstructural study of crnicofemn high entropy alloy obtained by selective laser melting
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9414008/
https://www.ncbi.nlm.nih.gov/pubmed/36013680
http://dx.doi.org/10.3390/ma15165544
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