Equal channel angular sheet extrusion (ECASE) produces twinning heterogeneity in commercially pure titanium

Commercially pure grade 2 titanium in sheet form was processed by equal channel angular sheet extrusion (ECASE) up to two passes at room temperature. The ECASE process generated a heterogeneous state of deformation, mainly affecting the sheet metal edges´ vicinity. The deformation heterogeneity gave...

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Authors: Muñoz Bolaños, Jairo Alberto|||0000-0002-6129-0799, Melia, Mariela, Avalos, Martina Cecilia, Bolmaro, Raúl
Format: article
Publication Date:2021
Country:España
Institution:Universitat Politècnica de Catalunya (UPC)
Repository:UPCommons. Portal del coneixement obert de la UPC
Language:English
OAI Identifier:oai:upcommons.upc.edu:2117/374806
Online Access:https://hdl.handle.net/2117/374806
https://dx.doi.org/10.1016/j.matchar.2021.111460
Access Level:Open access
Keyword:Titanium
Microstructure
Strain heterogeneity
Heterogeneous microstructure
Tensile strength
Twinning
Titani
Microestructura
Àrees temàtiques de la UPC::Enginyeria dels materials
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spelling Equal channel angular sheet extrusion (ECASE) produces twinning heterogeneity in commercially pure titaniumMuñoz Bolaños, Jairo Alberto|||0000-0002-6129-0799Melia, MarielaAvalos, Martina CeciliaBolmaro, RaúlTitaniumMicrostructureTitaniumStrain heterogeneityHeterogeneous microstructureTensile strengthTwinningTitaniMicroestructuraÀrees temàtiques de la UPC::Enginyeria dels materialsCommercially pure grade 2 titanium in sheet form was processed by equal channel angular sheet extrusion (ECASE) up to two passes at room temperature. The ECASE process generated a heterogeneous state of deformation, mainly affecting the sheet metal edges´ vicinity. The deformation heterogeneity gave rise to notable microstructural changes throughout the sheet thickness with high densities of twins located around 600 µm from the sheet edges. At the same time, the middle zone was kept free of twins. The highest twin density generated with the ECASE process corresponds mostly to tension twins of type oriented towards the extrusion direction. The heterogeneous structure produced a material strength increase of 200 MPa, maintaining a uniform deformation zone of 10%. The good strength-ductility combination was related to a heterogeneous distribution of geometrically necessary dislocations (GNDs) between the hardest and softest areas. The edge areas presented greater GNDs of type ¿a¿ on the twins' exterior than in their interior while in the middle zone, the highest GND densities grouped around triple points and grain boundaries. It was found that the grains with the most significant capacity to nucleate twins and store GNDs were those with the c-axis of the crystals parallel to the normal direction (ND). According to the Hall-Petch relationship, the strength improvement of the heterogeneous material comes from the grain size reduction mainly due to twins induced by deformation around the edge areas.Peer Reviewed20212021-11-0120222022-10-21journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/374806https://dx.doi.org/10.1016/j.matchar.2021.111460reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3748062026-05-27T15:37:01Z
dc.title.none.fl_str_mv Equal channel angular sheet extrusion (ECASE) produces twinning heterogeneity in commercially pure titanium
title Equal channel angular sheet extrusion (ECASE) produces twinning heterogeneity in commercially pure titanium
spellingShingle Equal channel angular sheet extrusion (ECASE) produces twinning heterogeneity in commercially pure titanium
Muñoz Bolaños, Jairo Alberto|||0000-0002-6129-0799
Titanium
Microstructure
Titanium
Strain heterogeneity
Heterogeneous microstructure
Tensile strength
Twinning
Titani
Microestructura
Àrees temàtiques de la UPC::Enginyeria dels materials
title_short Equal channel angular sheet extrusion (ECASE) produces twinning heterogeneity in commercially pure titanium
title_full Equal channel angular sheet extrusion (ECASE) produces twinning heterogeneity in commercially pure titanium
title_fullStr Equal channel angular sheet extrusion (ECASE) produces twinning heterogeneity in commercially pure titanium
title_full_unstemmed Equal channel angular sheet extrusion (ECASE) produces twinning heterogeneity in commercially pure titanium
title_sort Equal channel angular sheet extrusion (ECASE) produces twinning heterogeneity in commercially pure titanium
dc.creator.none.fl_str_mv Muñoz Bolaños, Jairo Alberto|||0000-0002-6129-0799
Melia, Mariela
Avalos, Martina Cecilia
Bolmaro, Raúl
author Muñoz Bolaños, Jairo Alberto|||0000-0002-6129-0799
author_facet Muñoz Bolaños, Jairo Alberto|||0000-0002-6129-0799
Melia, Mariela
Avalos, Martina Cecilia
Bolmaro, Raúl
author_role author
author2 Melia, Mariela
Avalos, Martina Cecilia
Bolmaro, Raúl
author2_role author
author
author
dc.subject.none.fl_str_mv Titanium
Microstructure
Titanium
Strain heterogeneity
Heterogeneous microstructure
Tensile strength
Twinning
Titani
Microestructura
Àrees temàtiques de la UPC::Enginyeria dels materials
topic Titanium
Microstructure
Titanium
Strain heterogeneity
Heterogeneous microstructure
Tensile strength
Twinning
Titani
Microestructura
Àrees temàtiques de la UPC::Enginyeria dels materials
description Commercially pure grade 2 titanium in sheet form was processed by equal channel angular sheet extrusion (ECASE) up to two passes at room temperature. The ECASE process generated a heterogeneous state of deformation, mainly affecting the sheet metal edges´ vicinity. The deformation heterogeneity gave rise to notable microstructural changes throughout the sheet thickness with high densities of twins located around 600 µm from the sheet edges. At the same time, the middle zone was kept free of twins. The highest twin density generated with the ECASE process corresponds mostly to tension twins of type oriented towards the extrusion direction. The heterogeneous structure produced a material strength increase of 200 MPa, maintaining a uniform deformation zone of 10%. The good strength-ductility combination was related to a heterogeneous distribution of geometrically necessary dislocations (GNDs) between the hardest and softest areas. The edge areas presented greater GNDs of type ¿a¿ on the twins' exterior than in their interior while in the middle zone, the highest GND densities grouped around triple points and grain boundaries. It was found that the grains with the most significant capacity to nucleate twins and store GNDs were those with the c-axis of the crystals parallel to the normal direction (ND). According to the Hall-Petch relationship, the strength improvement of the heterogeneous material comes from the grain size reduction mainly due to twins induced by deformation around the edge areas.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021-11-01
2022
2022-10-21
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/374806
https://dx.doi.org/10.1016/j.matchar.2021.111460
url https://hdl.handle.net/2117/374806
https://dx.doi.org/10.1016/j.matchar.2021.111460
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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