Oscillatory Mechanism of α-Fe(N) ↔ γ’-Fe4N Phase Transformations during Nanocrystalline Iron Nitriding

Autor:	Walerian Arabczyk, Katarzyna Skulmowska, Rafał Pelka, Zofia Lendzion-Bieluń
Jazyk:	angličtina
Rok vydání:	2022
Předmět:	nanocrystalline iron nitriding process kinetics oscillations ammonia Technology Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Zdroj:	Materials, Vol 15, Iss 3, p 1006 (2022)
Druh dokumentu:	article
ISSN:	1996-1944
DOI:	10.3390/ma15031006
Popis:	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’-Fe4N went through six metastable FeNx states. The continuous function proposed by Fowler and Guggenheim was modified to a stepwise variable function.
Databáze:	Directory of Open Access Journals
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