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Improve sensitization and corrosion resistance of an Al-Mg alloy by optimization of grain boundaries

The sensitization and subsequent intergranular corrosion of Al-5.3 wt.% Mg alloy has been shown to be an important factor in stress corrosion cracking of Al-Mg alloys. Understanding sensitization requires the review of grain boundary character on the precipitation process which can assist in develop...

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Autores principales: Yan, Jianfeng, Heckman, Nathan M., Velasco, Leonardo, Hodge, Andrea M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4882518/
https://www.ncbi.nlm.nih.gov/pubmed/27230299
http://dx.doi.org/10.1038/srep26870
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author Yan, Jianfeng
Heckman, Nathan M.
Velasco, Leonardo
Hodge, Andrea M.
author_facet Yan, Jianfeng
Heckman, Nathan M.
Velasco, Leonardo
Hodge, Andrea M.
author_sort Yan, Jianfeng
collection PubMed
description The sensitization and subsequent intergranular corrosion of Al-5.3 wt.% Mg alloy has been shown to be an important factor in stress corrosion cracking of Al-Mg alloys. Understanding sensitization requires the review of grain boundary character on the precipitation process which can assist in developing and designing alloys with improved corrosion resistance. This study shows that the degree of precipitation in Al-Mg alloy is dependent on grain boundary misorientation angle, adjacent grain boundary planes and grain boundary types. The results show that the misorientation angle is the most important factor influencing precipitation in grain boundaries of the Al-Mg alloy. Low angle grain boundaries (≤15°) have better immunity to precipitation and grain boundary acid attack. High angle grain boundaries (>15°) are vulnerable to grain boundary acid attack. Grain boundaries with adjacent plane orientations near to {100} have potential for immunity to precipitation and grain boundary acid attack. This work shows that low Σ (Σ ≤ 29) coincident site lattice (CSL) grain boundaries have thinner β precipitates. Modified nitric acid mass loss test and polarization test demonstrated that the global corrosion resistance of sputtered Al-Mg alloy is enhanced. This may be attributed to the increased fractions of low Σ (Σ ≤ 29) CSL grain boundaries after sputtering.
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spelling pubmed-48825182016-06-08 Improve sensitization and corrosion resistance of an Al-Mg alloy by optimization of grain boundaries Yan, Jianfeng Heckman, Nathan M. Velasco, Leonardo Hodge, Andrea M. Sci Rep Article The sensitization and subsequent intergranular corrosion of Al-5.3 wt.% Mg alloy has been shown to be an important factor in stress corrosion cracking of Al-Mg alloys. Understanding sensitization requires the review of grain boundary character on the precipitation process which can assist in developing and designing alloys with improved corrosion resistance. This study shows that the degree of precipitation in Al-Mg alloy is dependent on grain boundary misorientation angle, adjacent grain boundary planes and grain boundary types. The results show that the misorientation angle is the most important factor influencing precipitation in grain boundaries of the Al-Mg alloy. Low angle grain boundaries (≤15°) have better immunity to precipitation and grain boundary acid attack. High angle grain boundaries (>15°) are vulnerable to grain boundary acid attack. Grain boundaries with adjacent plane orientations near to {100} have potential for immunity to precipitation and grain boundary acid attack. This work shows that low Σ (Σ ≤ 29) coincident site lattice (CSL) grain boundaries have thinner β precipitates. Modified nitric acid mass loss test and polarization test demonstrated that the global corrosion resistance of sputtered Al-Mg alloy is enhanced. This may be attributed to the increased fractions of low Σ (Σ ≤ 29) CSL grain boundaries after sputtering. Nature Publishing Group 2016-05-27 /pmc/articles/PMC4882518/ /pubmed/27230299 http://dx.doi.org/10.1038/srep26870 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Yan, Jianfeng
Heckman, Nathan M.
Velasco, Leonardo
Hodge, Andrea M.
Improve sensitization and corrosion resistance of an Al-Mg alloy by optimization of grain boundaries
title Improve sensitization and corrosion resistance of an Al-Mg alloy by optimization of grain boundaries
title_full Improve sensitization and corrosion resistance of an Al-Mg alloy by optimization of grain boundaries
title_fullStr Improve sensitization and corrosion resistance of an Al-Mg alloy by optimization of grain boundaries
title_full_unstemmed Improve sensitization and corrosion resistance of an Al-Mg alloy by optimization of grain boundaries
title_short Improve sensitization and corrosion resistance of an Al-Mg alloy by optimization of grain boundaries
title_sort improve sensitization and corrosion resistance of an al-mg alloy by optimization of grain boundaries
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4882518/
https://www.ncbi.nlm.nih.gov/pubmed/27230299
http://dx.doi.org/10.1038/srep26870
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