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Mechanical Spectroscopy Study of CrNiCoFeMn High-Entropy Alloys

The equiatomic high-entropy alloy of composition of CrNiCoFeMn with an FCC crystal structure was prepared by either induction melting or additive manufacturing with a selective laser melting (SLM) process, starting from mechanically alloyed powders. The as-produced samples of both kinds were cold wo...

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Autores principales: Campari, Enrico Gianfranco, Casagrande, Angelo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10221001/
https://www.ncbi.nlm.nih.gov/pubmed/37241317
http://dx.doi.org/10.3390/ma16103689
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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 equiatomic high-entropy alloy of composition of CrNiCoFeMn with an FCC crystal structure was prepared by either induction melting or additive manufacturing with a selective laser melting (SLM) process, starting from mechanically alloyed powders. The as-produced samples of both kinds were cold worked, and in some cases re-crystallized. Unlike induction melting, there is a second phase, which is made of fine nitride and Cr-rich σ phase precipitates, in the as-produced SLM alloy. Young’s modulus and damping measurements, as a function of temperature in the 300–800 K range, were performed on the specimens that were cold-worked and/or re-crystallized. Young’s modulus values of (140 ± 10) GPa and (90 ± 10) GPa were measured from the resonance frequency of free-clamped bar-shaped samples at 300 K for the induction-melted and SLM samples, respectively. The room temperature values increased to (160 ± 10) GPa and (170 ± 10) GPa for the re-crystallized samples. The damping measurements showed two peaks, which were attributed to dislocation bending and grain-boundary sliding. The peaks were superposed on an increasing temperature background.
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spelling pubmed-102210012023-05-28 Mechanical Spectroscopy Study of CrNiCoFeMn High-Entropy Alloys Campari, Enrico Gianfranco Casagrande, Angelo Materials (Basel) Article The equiatomic high-entropy alloy of composition of CrNiCoFeMn with an FCC crystal structure was prepared by either induction melting or additive manufacturing with a selective laser melting (SLM) process, starting from mechanically alloyed powders. The as-produced samples of both kinds were cold worked, and in some cases re-crystallized. Unlike induction melting, there is a second phase, which is made of fine nitride and Cr-rich σ phase precipitates, in the as-produced SLM alloy. Young’s modulus and damping measurements, as a function of temperature in the 300–800 K range, were performed on the specimens that were cold-worked and/or re-crystallized. Young’s modulus values of (140 ± 10) GPa and (90 ± 10) GPa were measured from the resonance frequency of free-clamped bar-shaped samples at 300 K for the induction-melted and SLM samples, respectively. The room temperature values increased to (160 ± 10) GPa and (170 ± 10) GPa for the re-crystallized samples. The damping measurements showed two peaks, which were attributed to dislocation bending and grain-boundary sliding. The peaks were superposed on an increasing temperature background. MDPI 2023-05-12 /pmc/articles/PMC10221001/ /pubmed/37241317 http://dx.doi.org/10.3390/ma16103689 Text en © 2023 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
Mechanical Spectroscopy Study of CrNiCoFeMn High-Entropy Alloys
title Mechanical Spectroscopy Study of CrNiCoFeMn High-Entropy Alloys
title_full Mechanical Spectroscopy Study of CrNiCoFeMn High-Entropy Alloys
title_fullStr Mechanical Spectroscopy Study of CrNiCoFeMn High-Entropy Alloys
title_full_unstemmed Mechanical Spectroscopy Study of CrNiCoFeMn High-Entropy Alloys
title_short Mechanical Spectroscopy Study of CrNiCoFeMn High-Entropy Alloys
title_sort mechanical spectroscopy study of crnicofemn high-entropy alloys
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10221001/
https://www.ncbi.nlm.nih.gov/pubmed/37241317
http://dx.doi.org/10.3390/ma16103689
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