Microalloying Ultrafine Grained Al Alloys with Enhanced Ductility

Bulk ultrafine grained (UFG)/nanocrystal metals possess exceptional strength but normally poor ductility and thermal stability, which hinder their practical applications especially in high-temperature environments. Through microalloying strategy that enables the control of grains and precipitations...

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Main Authors:	Jiang, L., Li, J. K., Cheng, P. M., Liu, G., Wang, R. H., Chen, B. A., Zhang, J. Y., Sun, J., Yang, M. X., Yang, G.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2014
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3884224/

id	pubmed-3884224
recordtype	oai_dc
spelling	pubmed-38842242014-01-08 Microalloying Ultrafine Grained Al Alloys with Enhanced Ductility Jiang, L. Li, J. K. Cheng, P. M. Liu, G. Wang, R. H. Chen, B. A. Zhang, J. Y. Sun, J. Yang, M. X. Yang, G. Article Bulk ultrafine grained (UFG)/nanocrystal metals possess exceptional strength but normally poor ductility and thermal stability, which hinder their practical applications especially in high-temperature environments. Through microalloying strategy that enables the control of grains and precipitations in nanostructured regime, here we design and successfully produce a highly microstructure-stable UFG Al-Cu-Sc alloy with ~275% increment in ductility and simultaneously ~50% enhancement in yield strength compared with its Sc-free counterpart. Although the precipitations in UFG alloys are usually preferentially occurred at grain boundaries even at room temperature, minor Sc addition into the UFG Al-Cu alloys is found to effectively stabilize the as-processed microstructure, strongly suppress the θ-Al2Cu phase precipitation at grain boundary, and remarkably promote the θ′-Al2Cu nanoparticles dispersed in the grain interior in artificial aging. A similar microalloying strategy is expected to be equally effective for other UFG heat-treatable alloys. Nature Publishing Group 2014-01-08 /pmc/articles/PMC3884224/ /pubmed/24398915 http://dx.doi.org/10.1038/srep03605 Text en Copyright © 2014, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-nd/3.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Jiang, L. Li, J. K. Cheng, P. M. Liu, G. Wang, R. H. Chen, B. A. Zhang, J. Y. Sun, J. Yang, M. X. Yang, G.
spellingShingle	Jiang, L. Li, J. K. Cheng, P. M. Liu, G. Wang, R. H. Chen, B. A. Zhang, J. Y. Sun, J. Yang, M. X. Yang, G. Microalloying Ultrafine Grained Al Alloys with Enhanced Ductility
author_facet	Jiang, L. Li, J. K. Cheng, P. M. Liu, G. Wang, R. H. Chen, B. A. Zhang, J. Y. Sun, J. Yang, M. X. Yang, G.
author_sort	Jiang, L.
title	Microalloying Ultrafine Grained Al Alloys with Enhanced Ductility
title_short	Microalloying Ultrafine Grained Al Alloys with Enhanced Ductility
title_full	Microalloying Ultrafine Grained Al Alloys with Enhanced Ductility
title_fullStr	Microalloying Ultrafine Grained Al Alloys with Enhanced Ductility
title_full_unstemmed	Microalloying Ultrafine Grained Al Alloys with Enhanced Ductility
title_sort	microalloying ultrafine grained al alloys with enhanced ductility
description	Bulk ultrafine grained (UFG)/nanocrystal metals possess exceptional strength but normally poor ductility and thermal stability, which hinder their practical applications especially in high-temperature environments. Through microalloying strategy that enables the control of grains and precipitations in nanostructured regime, here we design and successfully produce a highly microstructure-stable UFG Al-Cu-Sc alloy with ~275% increment in ductility and simultaneously ~50% enhancement in yield strength compared with its Sc-free counterpart. Although the precipitations in UFG alloys are usually preferentially occurred at grain boundaries even at room temperature, minor Sc addition into the UFG Al-Cu alloys is found to effectively stabilize the as-processed microstructure, strongly suppress the θ-Al2Cu phase precipitation at grain boundary, and remarkably promote the θ′-Al2Cu nanoparticles dispersed in the grain interior in artificial aging. A similar microalloying strategy is expected to be equally effective for other UFG heat-treatable alloys.
publisher	Nature Publishing Group
publishDate	2014
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3884224/
_version_	1612045254570016768

Microalloying Ultrafine Grained Al Alloys with Enhanced Ductility

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