Effects of surface nanocrystallization on the anodic oxidation behavior of Aluminum

Gradient microstructures on the surface of metals induced by severe shot peening (SSP) is relatively a new research topic in the field of severe plastic deformation processing. The treated surface is known to show three distinct features: a spectrum of grain size from nanometer to sub-micron to micr...

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Autores principales:	Asghar Heydari Astaraee, Reza Miresmaeili, Sara Bagherifard, Mario Guagliano
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	AA1050 Al Surface nanocrystallization Severe shot peening Anodizing Porous anodic oxide Mechanics of engineering. Applied mechanics TA349-359 Technology T
Acceso en línea:	https://doaj.org/article/484531d8cd00431196e999bb5b944623
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spelling	oai:doaj.org-article:484531d8cd00431196e999bb5b9446232021-11-18T04:51:55ZEffects of surface nanocrystallization on the anodic oxidation behavior of Aluminum2666-359710.1016/j.finmec.2021.100028https://doaj.org/article/484531d8cd00431196e999bb5b9446232021-10-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666359721000196https://doaj.org/toc/2666-3597Gradient microstructures on the surface of metals induced by severe shot peening (SSP) is relatively a new research topic in the field of severe plastic deformation processing. The treated surface is known to show three distinct features: a spectrum of grain size from nanometer to sub-micron to micron regime, a work-hardened surface layer, and a compressive residual stress profile near the surface. The current study is defined to investigate the effects of SSP pre-preprocessing on the anodization behavior of Aluminum. Gradient microstructures were obtained on AA1050 Al substrate using SSP with different coverage levels. SSP was performed with ceramic media to prevent contamination of the treated surface. Then the treated surface was anodized at a constant voltage in a sulfuric acid solution. The current-time responses were recorded to study the reaction kinetics. The average grain size on the surface treated by SSP was evaluated to be 255.6 nm and 181.5 nm for 1000% and 2000% coverage levels, respectively, using X-ray diffraction; while the Vickers microhardness was increased from 10.8 HV for the untreated sample to 19.8 HV and 25.8 HV by SSP with 1000% and 2000% coverage levels, respectively. It was found that the nanocrystalline microstructure of Al substrate enhances the growth rate of anodic oxide. A variable growth rate is detected within the treated layer. The nucleation of anodic oxide nanopores is discussed in terms of underlying oxide formation mechanisms and the extent of surface grain refinement.Asghar Heydari AstaraeeReza MiresmaeiliSara BagherifardMario GuaglianoElsevierarticleAA1050 AlSurface nanocrystallizationSevere shot peeningAnodizingPorous anodic oxideMechanics of engineering. Applied mechanicsTA349-359TechnologyTENForces in Mechanics, Vol 4, Iss , Pp 100028- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	AA1050 Al Surface nanocrystallization Severe shot peening Anodizing Porous anodic oxide Mechanics of engineering. Applied mechanics TA349-359 Technology T
spellingShingle	AA1050 Al Surface nanocrystallization Severe shot peening Anodizing Porous anodic oxide Mechanics of engineering. Applied mechanics TA349-359 Technology T Asghar Heydari Astaraee Reza Miresmaeili Sara Bagherifard Mario Guagliano Effects of surface nanocrystallization on the anodic oxidation behavior of Aluminum
description	Gradient microstructures on the surface of metals induced by severe shot peening (SSP) is relatively a new research topic in the field of severe plastic deformation processing. The treated surface is known to show three distinct features: a spectrum of grain size from nanometer to sub-micron to micron regime, a work-hardened surface layer, and a compressive residual stress profile near the surface. The current study is defined to investigate the effects of SSP pre-preprocessing on the anodization behavior of Aluminum. Gradient microstructures were obtained on AA1050 Al substrate using SSP with different coverage levels. SSP was performed with ceramic media to prevent contamination of the treated surface. Then the treated surface was anodized at a constant voltage in a sulfuric acid solution. The current-time responses were recorded to study the reaction kinetics. The average grain size on the surface treated by SSP was evaluated to be 255.6 nm and 181.5 nm for 1000% and 2000% coverage levels, respectively, using X-ray diffraction; while the Vickers microhardness was increased from 10.8 HV for the untreated sample to 19.8 HV and 25.8 HV by SSP with 1000% and 2000% coverage levels, respectively. It was found that the nanocrystalline microstructure of Al substrate enhances the growth rate of anodic oxide. A variable growth rate is detected within the treated layer. The nucleation of anodic oxide nanopores is discussed in terms of underlying oxide formation mechanisms and the extent of surface grain refinement.
format	article
author	Asghar Heydari Astaraee Reza Miresmaeili Sara Bagherifard Mario Guagliano
author_facet	Asghar Heydari Astaraee Reza Miresmaeili Sara Bagherifard Mario Guagliano
author_sort	Asghar Heydari Astaraee
title	Effects of surface nanocrystallization on the anodic oxidation behavior of Aluminum
title_short	Effects of surface nanocrystallization on the anodic oxidation behavior of Aluminum
title_full	Effects of surface nanocrystallization on the anodic oxidation behavior of Aluminum
title_fullStr	Effects of surface nanocrystallization on the anodic oxidation behavior of Aluminum
title_full_unstemmed	Effects of surface nanocrystallization on the anodic oxidation behavior of Aluminum
title_sort	effects of surface nanocrystallization on the anodic oxidation behavior of aluminum
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/484531d8cd00431196e999bb5b944623
work_keys_str_mv	AT asgharheydariastaraee effectsofsurfacenanocrystallizationontheanodicoxidationbehaviorofaluminum AT rezamiresmaeili effectsofsurfacenanocrystallizationontheanodicoxidationbehaviorofaluminum AT sarabagherifard effectsofsurfacenanocrystallizationontheanodicoxidationbehaviorofaluminum AT marioguagliano effectsofsurfacenanocrystallizationontheanodicoxidationbehaviorofaluminum
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Effects of surface nanocrystallization on the anodic oxidation behavior of Aluminum

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