L12 ordering and δ′ precipitation in Al-Cu-Li

Abstract The precipitation mechanism of the δ′ (Al3Li) phase in Al-Li alloys has been controversially discussed in recent decades, specifically with respect to a conjectured congruent ordering process. However, kinetics in the Al-Li system does not allow to resolve the intermediate stages of precipi...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Pascal Neibecker, Michael Leitner, Muna Kushaim, Torben Boll, Dalaver Anjum, Tala’at Al-Kassab, Ferdinand Haider
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/703a482cff394560a84061612a903022
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:703a482cff394560a84061612a903022
record_format	dspace
spelling	oai:doaj.org-article:703a482cff394560a84061612a9030222021-12-02T11:40:13ZL12 ordering and δ′ precipitation in Al-Cu-Li10.1038/s41598-017-03203-z2045-2322https://doaj.org/article/703a482cff394560a84061612a9030222017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03203-zhttps://doaj.org/toc/2045-2322Abstract The precipitation mechanism of the δ′ (Al3Li) phase in Al-Li alloys has been controversially discussed in recent decades, specifically with respect to a conjectured congruent ordering process. However, kinetics in the Al-Li system does not allow to resolve the intermediate stages of precipitation and hence to experimentally clarify this issue. In this paper, we are revisiting the subject in ternary Al-Cu-Li alloys with pronouncedly slower kinetics, employing Transmission Electron Microscopy, High-Angle Annular Dark-Field Scanning Transmission Electron Microscopy, Differential Scanning Calorimetry and Atom Probe Tomography. The results show clear evidence for congruent ordering in a selected compositional range, revealing an already strongly L12 ordered microstructure after natural aging with a chemically homogeneous Li distribution and a decomposition of the alloy upon annealing at elevated temperatures. The presented study of the δ′ precipitation evaluates the reaction pathway of this process and compares it to the predictions of the Bragg-Williams-Gorsky model with respect to decomposition and ordering in this alloy system.Pascal NeibeckerMichael LeitnerMuna KushaimTorben BollDalaver AnjumTala’at Al-KassabFerdinand HaiderNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Pascal Neibecker Michael Leitner Muna Kushaim Torben Boll Dalaver Anjum Tala’at Al-Kassab Ferdinand Haider L12 ordering and δ′ precipitation in Al-Cu-Li
description	Abstract The precipitation mechanism of the δ′ (Al3Li) phase in Al-Li alloys has been controversially discussed in recent decades, specifically with respect to a conjectured congruent ordering process. However, kinetics in the Al-Li system does not allow to resolve the intermediate stages of precipitation and hence to experimentally clarify this issue. In this paper, we are revisiting the subject in ternary Al-Cu-Li alloys with pronouncedly slower kinetics, employing Transmission Electron Microscopy, High-Angle Annular Dark-Field Scanning Transmission Electron Microscopy, Differential Scanning Calorimetry and Atom Probe Tomography. The results show clear evidence for congruent ordering in a selected compositional range, revealing an already strongly L12 ordered microstructure after natural aging with a chemically homogeneous Li distribution and a decomposition of the alloy upon annealing at elevated temperatures. The presented study of the δ′ precipitation evaluates the reaction pathway of this process and compares it to the predictions of the Bragg-Williams-Gorsky model with respect to decomposition and ordering in this alloy system.
format	article
author	Pascal Neibecker Michael Leitner Muna Kushaim Torben Boll Dalaver Anjum Tala’at Al-Kassab Ferdinand Haider
author_facet	Pascal Neibecker Michael Leitner Muna Kushaim Torben Boll Dalaver Anjum Tala’at Al-Kassab Ferdinand Haider
author_sort	Pascal Neibecker
title	L12 ordering and δ′ precipitation in Al-Cu-Li
title_short	L12 ordering and δ′ precipitation in Al-Cu-Li
title_full	L12 ordering and δ′ precipitation in Al-Cu-Li
title_fullStr	L12 ordering and δ′ precipitation in Al-Cu-Li
title_full_unstemmed	L12 ordering and δ′ precipitation in Al-Cu-Li
title_sort	l12 ordering and δ′ precipitation in al-cu-li
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/703a482cff394560a84061612a903022
work_keys_str_mv	AT pascalneibecker l12orderinganddprecipitationinalculi AT michaelleitner l12orderinganddprecipitationinalculi AT munakushaim l12orderinganddprecipitationinalculi AT torbenboll l12orderinganddprecipitationinalculi AT dalaveranjum l12orderinganddprecipitationinalculi AT talaatalkassab l12orderinganddprecipitationinalculi AT ferdinandhaider l12orderinganddprecipitationinalculi
_version_	1718395705480970240

L12 ordering and δ′ precipitation in Al-Cu-Li

Ejemplares similares