Oscillatory Mechanism of α-Fe(N) ↔ γ’-Fe(4)N Phase Transformations during Nanocrystalline Iron Nitriding

The kinetics of nanocrystalline α-iron nitriding to γ’-iron nitride in an ammonia atmosphere was studied at 598–648 K and at atmospheric pressure. Oscillatory changes in nitriding reaction rates depending on nitrogen concentration in a solid sample were observed. This phenomenon was explained by a g...

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Autores principales: Arabczyk, Walerian, Skulmowska, Katarzyna, Pelka, Rafał, Lendzion-Bieluń, Zofia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Communication
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8838475/
https://www.ncbi.nlm.nih.gov/pubmed/35160951
http://dx.doi.org/10.3390/ma15031006
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author Arabczyk, Walerian
Skulmowska, Katarzyna
Pelka, Rafał
Lendzion-Bieluń, Zofia
author_facet Arabczyk, Walerian
Skulmowska, Katarzyna
Pelka, Rafał
Lendzion-Bieluń, Zofia
author_sort Arabczyk, Walerian
collection PubMed
description The kinetics of nanocrystalline α-iron nitriding to γ’-iron nitride in an ammonia atmosphere was studied at 598–648 K and at atmospheric pressure. Oscillatory changes in nitriding reaction rates depending on nitrogen concentration in a solid sample were observed. This phenomenon was explained by a gradual change in the iron active surface coverage degree, with nitrogen resulting from a gradual change in the free enthalpy of nitrogen segregation. The α-Fe(N) nanocrystallites’ transformation into γ’-Fe(4)N went through six metastable FeN(x) states. The continuous function proposed by Fowler and Guggenheim was modified to a stepwise variable function.
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spelling pubmed-88384752022-02-13 Oscillatory Mechanism of α-Fe(N) ↔ γ’-Fe(4)N Phase Transformations during Nanocrystalline Iron Nitriding Arabczyk, Walerian Skulmowska, Katarzyna Pelka, Rafał Lendzion-Bieluń, Zofia Materials (Basel) Communication The kinetics of nanocrystalline α-iron nitriding to γ’-iron nitride in an ammonia atmosphere was studied at 598–648 K and at atmospheric pressure. Oscillatory changes in nitriding reaction rates depending on nitrogen concentration in a solid sample were observed. This phenomenon was explained by a gradual change in the iron active surface coverage degree, with nitrogen resulting from a gradual change in the free enthalpy of nitrogen segregation. The α-Fe(N) nanocrystallites’ transformation into γ’-Fe(4)N went through six metastable FeN(x) states. The continuous function proposed by Fowler and Guggenheim was modified to a stepwise variable function. MDPI 2022-01-27 /pmc/articles/PMC8838475/ /pubmed/35160951 http://dx.doi.org/10.3390/ma15031006 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 Communication
Arabczyk, Walerian
Skulmowska, Katarzyna
Pelka, Rafał
Lendzion-Bieluń, Zofia
Oscillatory Mechanism of α-Fe(N) ↔ γ’-Fe(4)N Phase Transformations during Nanocrystalline Iron Nitriding
title Oscillatory Mechanism of α-Fe(N) ↔ γ’-Fe(4)N Phase Transformations during Nanocrystalline Iron Nitriding
title_full Oscillatory Mechanism of α-Fe(N) ↔ γ’-Fe(4)N Phase Transformations during Nanocrystalline Iron Nitriding
title_fullStr Oscillatory Mechanism of α-Fe(N) ↔ γ’-Fe(4)N Phase Transformations during Nanocrystalline Iron Nitriding
title_full_unstemmed Oscillatory Mechanism of α-Fe(N) ↔ γ’-Fe(4)N Phase Transformations during Nanocrystalline Iron Nitriding
title_short Oscillatory Mechanism of α-Fe(N) ↔ γ’-Fe(4)N Phase Transformations during Nanocrystalline Iron Nitriding
title_sort oscillatory mechanism of α-fe(n) ↔ γ’-fe(4)n phase transformations during nanocrystalline iron nitriding
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8838475/
https://www.ncbi.nlm.nih.gov/pubmed/35160951
http://dx.doi.org/10.3390/ma15031006
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