In-situ STEM imaging of growth and phase change of individual CuAlX precipitates in Al alloy

Abstract Age-hardening in Al alloys has been used for over a century to improve its mechanical properties. However, the lack of direct observation limits our understanding of the dynamic nature of the evolution of nanoprecipitates during age-hardening. Using in-situ (scanning) transmission electron...

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Autores principales:	Chunhui Liu, Sairam K. Malladi, Qiang Xu, Jianghua Chen, Frans D. Tichelaar, Xiaodong Zhuge, Henny W. Zandbergen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/272d6194fe004230bb498030f1ca0268
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spelling	oai:doaj.org-article:272d6194fe004230bb498030f1ca02682021-12-02T16:07:03ZIn-situ STEM imaging of growth and phase change of individual CuAlX precipitates in Al alloy10.1038/s41598-017-02081-92045-2322https://doaj.org/article/272d6194fe004230bb498030f1ca02682017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02081-9https://doaj.org/toc/2045-2322Abstract Age-hardening in Al alloys has been used for over a century to improve its mechanical properties. However, the lack of direct observation limits our understanding of the dynamic nature of the evolution of nanoprecipitates during age-hardening. Using in-situ (scanning) transmission electron microscopy (S/TEM) while heating an Al-Cu alloy, we were able to follow the growth of individual nanoprecipitates at atomic scale. The heat treatments carried out at 140, 160, 180 and 200 °C reveal a temperature dependence on the kinetics of precipitation and three kinds of interactions of nano-precipitates. These are precipitate-matrix, precipitate-dislocation, and precipitate-precipitate interactions. The diffusion of Cu and Al during these interactions, results in diffusion-controlled individual precipitate growth, an accelerated growth when interactions with dislocations occur and a size dependent precipitate-precipitate interaction: growth and shrinkage. Precipitates can grow and shrink at opposite ends at the same time resulting in an effective displacement. Furthermore, the evolution of the crystal structure within an individual nanoprecipiate, specifically the mechanism of formation of the strengthening phase, θ′, during heat-treatment is elucidated by following the same precipitate through its intermediate stages for the first time using in-situ S/TEM studies.Chunhui LiuSairam K. MalladiQiang XuJianghua ChenFrans D. TichelaarXiaodong ZhugeHenny W. ZandbergenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chunhui Liu Sairam K. Malladi Qiang Xu Jianghua Chen Frans D. Tichelaar Xiaodong Zhuge Henny W. Zandbergen In-situ STEM imaging of growth and phase change of individual CuAlX precipitates in Al alloy
description	Abstract Age-hardening in Al alloys has been used for over a century to improve its mechanical properties. However, the lack of direct observation limits our understanding of the dynamic nature of the evolution of nanoprecipitates during age-hardening. Using in-situ (scanning) transmission electron microscopy (S/TEM) while heating an Al-Cu alloy, we were able to follow the growth of individual nanoprecipitates at atomic scale. The heat treatments carried out at 140, 160, 180 and 200 °C reveal a temperature dependence on the kinetics of precipitation and three kinds of interactions of nano-precipitates. These are precipitate-matrix, precipitate-dislocation, and precipitate-precipitate interactions. The diffusion of Cu and Al during these interactions, results in diffusion-controlled individual precipitate growth, an accelerated growth when interactions with dislocations occur and a size dependent precipitate-precipitate interaction: growth and shrinkage. Precipitates can grow and shrink at opposite ends at the same time resulting in an effective displacement. Furthermore, the evolution of the crystal structure within an individual nanoprecipiate, specifically the mechanism of formation of the strengthening phase, θ′, during heat-treatment is elucidated by following the same precipitate through its intermediate stages for the first time using in-situ S/TEM studies.
format	article
author	Chunhui Liu Sairam K. Malladi Qiang Xu Jianghua Chen Frans D. Tichelaar Xiaodong Zhuge Henny W. Zandbergen
author_facet	Chunhui Liu Sairam K. Malladi Qiang Xu Jianghua Chen Frans D. Tichelaar Xiaodong Zhuge Henny W. Zandbergen
author_sort	Chunhui Liu
title	In-situ STEM imaging of growth and phase change of individual CuAlX precipitates in Al alloy
title_short	In-situ STEM imaging of growth and phase change of individual CuAlX precipitates in Al alloy
title_full	In-situ STEM imaging of growth and phase change of individual CuAlX precipitates in Al alloy
title_fullStr	In-situ STEM imaging of growth and phase change of individual CuAlX precipitates in Al alloy
title_full_unstemmed	In-situ STEM imaging of growth and phase change of individual CuAlX precipitates in Al alloy
title_sort	in-situ stem imaging of growth and phase change of individual cualx precipitates in al alloy
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/272d6194fe004230bb498030f1ca0268
work_keys_str_mv	AT chunhuiliu insitustemimagingofgrowthandphasechangeofindividualcualxprecipitatesinalalloy AT sairamkmalladi insitustemimagingofgrowthandphasechangeofindividualcualxprecipitatesinalalloy AT qiangxu insitustemimagingofgrowthandphasechangeofindividualcualxprecipitatesinalalloy AT jianghuachen insitustemimagingofgrowthandphasechangeofindividualcualxprecipitatesinalalloy AT fransdtichelaar insitustemimagingofgrowthandphasechangeofindividualcualxprecipitatesinalalloy AT xiaodongzhuge insitustemimagingofgrowthandphasechangeofindividualcualxprecipitatesinalalloy AT hennywzandbergen insitustemimagingofgrowthandphasechangeofindividualcualxprecipitatesinalalloy
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In-situ STEM imaging of growth and phase change of individual CuAlX precipitates in Al alloy

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