Local changes in the microstructure, mechanical and electrochemical properties of friction stir welded joints from aluminium of varying grain size

The present study shows results of friction stir welded (FSW) samples after different plastic deformation routes. The welds were made of coarse-grained and ultrafine-grained commercially pure aluminium. As a plastic deformation method a new hybrid process has been chosen, which resulted in obtaining...

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Autores principales:	Marta Orłowska, Florian Pixner, Andreas Hütter, Agnieszka Kooijman, Cezary Jasiński, Yaiza Gonzalez-Garcia, Norbert Enzinger, Małgorzata Lewandowska
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Aluminium Friction stir welding Ultrafine-grained microstructure Local characterization Mechanical properties Microcapillary Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/718200183e9e4eb58d3fc4ac033bee84
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spelling	oai:doaj.org-article:718200183e9e4eb58d3fc4ac033bee842021-11-28T04:32:41ZLocal changes in the microstructure, mechanical and electrochemical properties of friction stir welded joints from aluminium of varying grain size2238-785410.1016/j.jmrt.2021.11.057https://doaj.org/article/718200183e9e4eb58d3fc4ac033bee842021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421013375https://doaj.org/toc/2238-7854The present study shows results of friction stir welded (FSW) samples after different plastic deformation routes. The welds were made of coarse-grained and ultrafine-grained commercially pure aluminium. As a plastic deformation method a new hybrid process has been chosen, which resulted in obtaining samples with different characteristics of microstructure, which also differed in dependance of the examined plane. Microstructure observations showed that, regardless of the base material, due to continuous dynamic recrystallization a stir zone was characterized by equiaxial grains with an average size of 3.5–5.0 μm. However, significant differences in the changes of the microstructure in thermomechanically affected and heat affected zones have been obtained between welds. Microhardness profiles revealed a decrease in the stir zones in comparison with the initially deformed samples, but an increase for the annealed samples. Tensile tests showed differences between the samples. In the deformed samples, the rupture occurred in a stir zone, while in the undeformed samples in the base material. In addition, due to the application of 3D digital image correlation, it was possible to observe deformation and local changes between the weld zones during the tensile test. Additionally, local electrochemical measurements were performed with two sizes of working electrode, which included the application of microcapillary technique. The results showed higher corrosion resistance in 3.5% NaCl in the stir zones.Marta OrłowskaFlorian PixnerAndreas HütterAgnieszka KooijmanCezary JasińskiYaiza Gonzalez-GarciaNorbert EnzingerMałgorzata LewandowskaElsevierarticleAluminiumFriction stir weldingUltrafine-grained microstructureLocal characterizationMechanical propertiesMicrocapillaryMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 5968-5987 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Aluminium Friction stir welding Ultrafine-grained microstructure Local characterization Mechanical properties Microcapillary Mining engineering. Metallurgy TN1-997
spellingShingle	Aluminium Friction stir welding Ultrafine-grained microstructure Local characterization Mechanical properties Microcapillary Mining engineering. Metallurgy TN1-997 Marta Orłowska Florian Pixner Andreas Hütter Agnieszka Kooijman Cezary Jasiński Yaiza Gonzalez-Garcia Norbert Enzinger Małgorzata Lewandowska Local changes in the microstructure, mechanical and electrochemical properties of friction stir welded joints from aluminium of varying grain size
description	The present study shows results of friction stir welded (FSW) samples after different plastic deformation routes. The welds were made of coarse-grained and ultrafine-grained commercially pure aluminium. As a plastic deformation method a new hybrid process has been chosen, which resulted in obtaining samples with different characteristics of microstructure, which also differed in dependance of the examined plane. Microstructure observations showed that, regardless of the base material, due to continuous dynamic recrystallization a stir zone was characterized by equiaxial grains with an average size of 3.5–5.0 μm. However, significant differences in the changes of the microstructure in thermomechanically affected and heat affected zones have been obtained between welds. Microhardness profiles revealed a decrease in the stir zones in comparison with the initially deformed samples, but an increase for the annealed samples. Tensile tests showed differences between the samples. In the deformed samples, the rupture occurred in a stir zone, while in the undeformed samples in the base material. In addition, due to the application of 3D digital image correlation, it was possible to observe deformation and local changes between the weld zones during the tensile test. Additionally, local electrochemical measurements were performed with two sizes of working electrode, which included the application of microcapillary technique. The results showed higher corrosion resistance in 3.5% NaCl in the stir zones.
format	article
author	Marta Orłowska Florian Pixner Andreas Hütter Agnieszka Kooijman Cezary Jasiński Yaiza Gonzalez-Garcia Norbert Enzinger Małgorzata Lewandowska
author_facet	Marta Orłowska Florian Pixner Andreas Hütter Agnieszka Kooijman Cezary Jasiński Yaiza Gonzalez-Garcia Norbert Enzinger Małgorzata Lewandowska
author_sort	Marta Orłowska
title	Local changes in the microstructure, mechanical and electrochemical properties of friction stir welded joints from aluminium of varying grain size
title_short	Local changes in the microstructure, mechanical and electrochemical properties of friction stir welded joints from aluminium of varying grain size
title_full	Local changes in the microstructure, mechanical and electrochemical properties of friction stir welded joints from aluminium of varying grain size
title_fullStr	Local changes in the microstructure, mechanical and electrochemical properties of friction stir welded joints from aluminium of varying grain size
title_full_unstemmed	Local changes in the microstructure, mechanical and electrochemical properties of friction stir welded joints from aluminium of varying grain size
title_sort	local changes in the microstructure, mechanical and electrochemical properties of friction stir welded joints from aluminium of varying grain size
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/718200183e9e4eb58d3fc4ac033bee84
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Local changes in the microstructure, mechanical and electrochemical properties of friction stir welded joints from aluminium of varying grain size

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