Competing nucleation of single- and double-layer Guinier–Preston zones in Al–Cu alloys

Abstract Solid-state precipitation is a key heat-treatment strategy for strengthening engineering alloys. Therefore, predicting the precipitation process of localized solute-rich clusters, such as Guinier–Preston (GP) zones, is necessary. We quantitatively evaluated the critical nucleus size and nuc...

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Autores principales:	Hiroshi Miyoshi, Hajime Kimizuka, Akio Ishii, Shigenobu Ogata
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a817cb7b5068429dac450474883e1634
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spelling	oai:doaj.org-article:a817cb7b5068429dac450474883e16342021-12-02T15:53:59ZCompeting nucleation of single- and double-layer Guinier–Preston zones in Al–Cu alloys10.1038/s41598-021-83920-82045-2322https://doaj.org/article/a817cb7b5068429dac450474883e16342021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-83920-8https://doaj.org/toc/2045-2322Abstract Solid-state precipitation is a key heat-treatment strategy for strengthening engineering alloys. Therefore, predicting the precipitation process of localized solute-rich clusters, such as Guinier–Preston (GP) zones, is necessary. We quantitatively evaluated the critical nucleus size and nucleation barrier of GP zones in Al–Cu alloys, illustrating the precipitation preferences of single-layer (GP1) and double-layer (GP2) GP zones. Based on classical nucleation theory using an effective multi-body potential for dilute Al–Cu systems, our model predicted GP1 and GP2 precipitation sequences at various temperatures and Cu concentrations in a manner consistent with experimental observations. The crossover between formation enthalpy curves of GP1 and GP2 with increasing cluster size determines the critical conditions under which GP2 zones can nucleate without prior formation of GP1 zones. This relationship reflects competing interactions within and between clusters. The results illustrate the underlying mechanisms of competing nucleation between zones, and provide guidance for tailoring aging conditions to achieve desired mechanical properties for specific applications.Hiroshi MiyoshiHajime KimizukaAkio IshiiShigenobu OgataNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hiroshi Miyoshi Hajime Kimizuka Akio Ishii Shigenobu Ogata Competing nucleation of single- and double-layer Guinier–Preston zones in Al–Cu alloys
description	Abstract Solid-state precipitation is a key heat-treatment strategy for strengthening engineering alloys. Therefore, predicting the precipitation process of localized solute-rich clusters, such as Guinier–Preston (GP) zones, is necessary. We quantitatively evaluated the critical nucleus size and nucleation barrier of GP zones in Al–Cu alloys, illustrating the precipitation preferences of single-layer (GP1) and double-layer (GP2) GP zones. Based on classical nucleation theory using an effective multi-body potential for dilute Al–Cu systems, our model predicted GP1 and GP2 precipitation sequences at various temperatures and Cu concentrations in a manner consistent with experimental observations. The crossover between formation enthalpy curves of GP1 and GP2 with increasing cluster size determines the critical conditions under which GP2 zones can nucleate without prior formation of GP1 zones. This relationship reflects competing interactions within and between clusters. The results illustrate the underlying mechanisms of competing nucleation between zones, and provide guidance for tailoring aging conditions to achieve desired mechanical properties for specific applications.
format	article
author	Hiroshi Miyoshi Hajime Kimizuka Akio Ishii Shigenobu Ogata
author_facet	Hiroshi Miyoshi Hajime Kimizuka Akio Ishii Shigenobu Ogata
author_sort	Hiroshi Miyoshi
title	Competing nucleation of single- and double-layer Guinier–Preston zones in Al–Cu alloys
title_short	Competing nucleation of single- and double-layer Guinier–Preston zones in Al–Cu alloys
title_full	Competing nucleation of single- and double-layer Guinier–Preston zones in Al–Cu alloys
title_fullStr	Competing nucleation of single- and double-layer Guinier–Preston zones in Al–Cu alloys
title_full_unstemmed	Competing nucleation of single- and double-layer Guinier–Preston zones in Al–Cu alloys
title_sort	competing nucleation of single- and double-layer guinier–preston zones in al–cu alloys
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a817cb7b5068429dac450474883e1634
work_keys_str_mv	AT hiroshimiyoshi competingnucleationofsingleanddoublelayerguinierprestonzonesinalcualloys AT hajimekimizuka competingnucleationofsingleanddoublelayerguinierprestonzonesinalcualloys AT akioishii competingnucleationofsingleanddoublelayerguinierprestonzonesinalcualloys AT shigenobuogata competingnucleationofsingleanddoublelayerguinierprestonzonesinalcualloys
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Competing nucleation of single- and double-layer Guinier–Preston zones in Al–Cu alloys

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