Low temperature a/b nanotwins in Ni50Mn25+x Ga25−x Heusler alloys

Abstract We have found low temperature a/b nanotwins having (110) twinning plane in a five-layered modulated martensite phase of Ni50Mn25+x Ga25−x (at. %) Heusler alloys and identified the particular region in phase diagram where the nanotwinning occurs. Evolution of the structure with decreasing te...

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Autores principales:	L. Straka, J. Drahokoupil, P. Veřtát, M. Zelený, J. Kopeček, A. Sozinov, O. Heczko
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1ef284998d3f44e7910b539cadb0824e
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spelling	oai:doaj.org-article:1ef284998d3f44e7910b539cadb0824e2021-12-02T15:08:34ZLow temperature a/b nanotwins in Ni50Mn25+x Ga25−x Heusler alloys10.1038/s41598-018-30388-82045-2322https://doaj.org/article/1ef284998d3f44e7910b539cadb0824e2018-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-30388-8https://doaj.org/toc/2045-2322Abstract We have found low temperature a/b nanotwins having (110) twinning plane in a five-layered modulated martensite phase of Ni50Mn25+x Ga25−x (at. %) Heusler alloys and identified the particular region in phase diagram where the nanotwinning occurs. Evolution of the structure with decreasing temperature was studied by X-ray diffraction using single crystals exhibiting magnetic shape memory effect. The merging of (400) and (040) lines upon cooling for 2.6 < x < 3.5 indicated a/b nanotwinning originating from the refinement of initially coarse a/b twins. Refinement of the twins with decreasing temperature was observed directly using scanning electron microscopy. The prerequisite for nanotwinning is an extremely low twin boundary energy, which we estimated using first-principles calculations to be 0.16 meV/Å2. As the nanotwinning distorts the relation between the crystal lattice and the X-ray diffraction pattern, it should be taken into consideration in structural studies of Ni-Mn-Ga Heusler alloys.L. StrakaJ. DrahokoupilP. VeřtátM. ZelenýJ. KopečekA. SozinovO. HeczkoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-11 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q L. Straka J. Drahokoupil P. Veřtát M. Zelený J. Kopeček A. Sozinov O. Heczko Low temperature a/b nanotwins in Ni50Mn25+x Ga25−x Heusler alloys
description	Abstract We have found low temperature a/b nanotwins having (110) twinning plane in a five-layered modulated martensite phase of Ni50Mn25+x Ga25−x (at. %) Heusler alloys and identified the particular region in phase diagram where the nanotwinning occurs. Evolution of the structure with decreasing temperature was studied by X-ray diffraction using single crystals exhibiting magnetic shape memory effect. The merging of (400) and (040) lines upon cooling for 2.6 < x < 3.5 indicated a/b nanotwinning originating from the refinement of initially coarse a/b twins. Refinement of the twins with decreasing temperature was observed directly using scanning electron microscopy. The prerequisite for nanotwinning is an extremely low twin boundary energy, which we estimated using first-principles calculations to be 0.16 meV/Å2. As the nanotwinning distorts the relation between the crystal lattice and the X-ray diffraction pattern, it should be taken into consideration in structural studies of Ni-Mn-Ga Heusler alloys.
format	article
author	L. Straka J. Drahokoupil P. Veřtát M. Zelený J. Kopeček A. Sozinov O. Heczko
author_facet	L. Straka J. Drahokoupil P. Veřtát M. Zelený J. Kopeček A. Sozinov O. Heczko
author_sort	L. Straka
title	Low temperature a/b nanotwins in Ni50Mn25+x Ga25−x Heusler alloys
title_short	Low temperature a/b nanotwins in Ni50Mn25+x Ga25−x Heusler alloys
title_full	Low temperature a/b nanotwins in Ni50Mn25+x Ga25−x Heusler alloys
title_fullStr	Low temperature a/b nanotwins in Ni50Mn25+x Ga25−x Heusler alloys
title_full_unstemmed	Low temperature a/b nanotwins in Ni50Mn25+x Ga25−x Heusler alloys
title_sort	low temperature a/b nanotwins in ni50mn25+x ga25−x heusler alloys
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/1ef284998d3f44e7910b539cadb0824e
work_keys_str_mv	AT lstraka lowtemperatureabnanotwinsinni50mn25xga25xheusleralloys AT jdrahokoupil lowtemperatureabnanotwinsinni50mn25xga25xheusleralloys AT pvertat lowtemperatureabnanotwinsinni50mn25xga25xheusleralloys AT mzeleny lowtemperatureabnanotwinsinni50mn25xga25xheusleralloys AT jkopecek lowtemperatureabnanotwinsinni50mn25xga25xheusleralloys AT asozinov lowtemperatureabnanotwinsinni50mn25xga25xheusleralloys AT oheczko lowtemperatureabnanotwinsinni50mn25xga25xheusleralloys
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Low temperature a/b nanotwins in Ni50Mn25+x Ga25−x Heusler alloys

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