Alloying effect on the order–disorder transformation in tetragonal FeNi

Abstract Tetragonal ( $${\hbox{L1}}_{0}$$ L1 0 ) FeNi is a promising material for high-performance rare-earth-free permanent magnets. Pure tetragonal FeNi is very difficult to synthesize due to its low chemical order–disorder transition temperature ( $$\approx {593}$$ ≈ 593 K), and thus one must co...

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Autores principales:	Li-Yun Tian, Oliver Gutfleisch, Olle Eriksson, Levente Vitos
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/de6df49880934a65a01807c6b00f5a4f
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spelling	oai:doaj.org-article:de6df49880934a65a01807c6b00f5a4f2021-12-02T11:35:53ZAlloying effect on the order–disorder transformation in tetragonal FeNi10.1038/s41598-021-84482-52045-2322https://doaj.org/article/de6df49880934a65a01807c6b00f5a4f2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84482-5https://doaj.org/toc/2045-2322Abstract Tetragonal ( $${\hbox{L1}}_{0}$$ L1 0 ) FeNi is a promising material for high-performance rare-earth-free permanent magnets. Pure tetragonal FeNi is very difficult to synthesize due to its low chemical order–disorder transition temperature ( $$\approx {593}$$ ≈ 593 K), and thus one must consider alternative non-equilibrium processing routes and alloy design strategies that make the formation of tetragonal FeNi feasible. In this paper, we investigate by density functional theory as implemented in the exact muffin-tin orbitals method whether alloying FeNi with a suitable element can have a positive impact on the phase formation and ordering properties while largely maintaining its attractive intrinsic magnetic properties. We find that small amount of non-magnetic (Al and Ti) or magnetic (Cr and Co) elements increase the order–disorder transition temperature. Adding Mo to the Co-doped system further enhances the ordering temperature while the Curie temperature is decreased only by a few degrees. Our results show that alloying is a viable route to stabilizing the ordered tetragonal phase of FeNi.Li-Yun TianOliver GutfleischOlle ErikssonLevente VitosNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Li-Yun Tian Oliver Gutfleisch Olle Eriksson Levente Vitos Alloying effect on the order–disorder transformation in tetragonal FeNi
description	Abstract Tetragonal ( $${\hbox{L1}}_{0}$$ L1 0 ) FeNi is a promising material for high-performance rare-earth-free permanent magnets. Pure tetragonal FeNi is very difficult to synthesize due to its low chemical order–disorder transition temperature ( $$\approx {593}$$ ≈ 593 K), and thus one must consider alternative non-equilibrium processing routes and alloy design strategies that make the formation of tetragonal FeNi feasible. In this paper, we investigate by density functional theory as implemented in the exact muffin-tin orbitals method whether alloying FeNi with a suitable element can have a positive impact on the phase formation and ordering properties while largely maintaining its attractive intrinsic magnetic properties. We find that small amount of non-magnetic (Al and Ti) or magnetic (Cr and Co) elements increase the order–disorder transition temperature. Adding Mo to the Co-doped system further enhances the ordering temperature while the Curie temperature is decreased only by a few degrees. Our results show that alloying is a viable route to stabilizing the ordered tetragonal phase of FeNi.
format	article
author	Li-Yun Tian Oliver Gutfleisch Olle Eriksson Levente Vitos
author_facet	Li-Yun Tian Oliver Gutfleisch Olle Eriksson Levente Vitos
author_sort	Li-Yun Tian
title	Alloying effect on the order–disorder transformation in tetragonal FeNi
title_short	Alloying effect on the order–disorder transformation in tetragonal FeNi
title_full	Alloying effect on the order–disorder transformation in tetragonal FeNi
title_fullStr	Alloying effect on the order–disorder transformation in tetragonal FeNi
title_full_unstemmed	Alloying effect on the order–disorder transformation in tetragonal FeNi
title_sort	alloying effect on the order–disorder transformation in tetragonal feni
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/de6df49880934a65a01807c6b00f5a4f
work_keys_str_mv	AT liyuntian alloyingeffectontheorderdisordertransformationintetragonalfeni AT olivergutfleisch alloyingeffectontheorderdisordertransformationintetragonalfeni AT olleeriksson alloyingeffectontheorderdisordertransformationintetragonalfeni AT leventevitos alloyingeffectontheorderdisordertransformationintetragonalfeni
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Alloying effect on the order–disorder transformation in tetragonal FeNi

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