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Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

Surface mechanical attrition treatment (SMAT) was used to generate a gradient microstructure in commercial grade magnesium. Positron annihilation lifetime spectroscopy and variable energy positron beam measurements, as well as microhardness tests, electron backscatter diffraction, X-ray diffraction,...

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Autores principales: Skowron, Konrad, Dryzek, Ewa, Wróbel, Mirosław, Nowak, Paweł, Marciszko-Wiąckowska, Marianna, Le Joncour, Léa, François, Manuel, Panicaud, Benoit, Baczmański, Andrzej
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7558138/
https://www.ncbi.nlm.nih.gov/pubmed/32917049
http://dx.doi.org/10.3390/ma13184002
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author Skowron, Konrad
Dryzek, Ewa
Wróbel, Mirosław
Nowak, Paweł
Marciszko-Wiąckowska, Marianna
Le Joncour, Léa
François, Manuel
Panicaud, Benoit
Baczmański, Andrzej
author_facet Skowron, Konrad
Dryzek, Ewa
Wróbel, Mirosław
Nowak, Paweł
Marciszko-Wiąckowska, Marianna
Le Joncour, Léa
François, Manuel
Panicaud, Benoit
Baczmański, Andrzej
author_sort Skowron, Konrad
collection PubMed
description Surface mechanical attrition treatment (SMAT) was used to generate a gradient microstructure in commercial grade magnesium. Positron annihilation lifetime spectroscopy and variable energy positron beam measurements, as well as microhardness tests, electron backscatter diffraction, X-ray diffraction, and electrochemical corrosion tests, were used to investigate the created subsurface microstructure and its properties. It was found that SMAT causes an increase in dislocation density and grain refinement which results in increased hardness of the subsurface zone. The mean positron lifetime values indicate trapping of positrons in vacancies associated with dislocations and dislocation jogs. The increase of the SMAT duration and the vibration amplitude influences the depth profile of the mean positron lifetime, which reflects the defect concentration profile. Electrochemical measurements revealed that the structure induced by SMAT increases the susceptibility of magnesium to anodic oxidation, leading to the enhanced formation of hydroxide coverage at the surface and, as a consequence, to the decrease in corrosion current. No significant effect of the treatment on the residual stress was found.
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spelling pubmed-75581382020-10-29 Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods Skowron, Konrad Dryzek, Ewa Wróbel, Mirosław Nowak, Paweł Marciszko-Wiąckowska, Marianna Le Joncour, Léa François, Manuel Panicaud, Benoit Baczmański, Andrzej Materials (Basel) Article Surface mechanical attrition treatment (SMAT) was used to generate a gradient microstructure in commercial grade magnesium. Positron annihilation lifetime spectroscopy and variable energy positron beam measurements, as well as microhardness tests, electron backscatter diffraction, X-ray diffraction, and electrochemical corrosion tests, were used to investigate the created subsurface microstructure and its properties. It was found that SMAT causes an increase in dislocation density and grain refinement which results in increased hardness of the subsurface zone. The mean positron lifetime values indicate trapping of positrons in vacancies associated with dislocations and dislocation jogs. The increase of the SMAT duration and the vibration amplitude influences the depth profile of the mean positron lifetime, which reflects the defect concentration profile. Electrochemical measurements revealed that the structure induced by SMAT increases the susceptibility of magnesium to anodic oxidation, leading to the enhanced formation of hydroxide coverage at the surface and, as a consequence, to the decrease in corrosion current. No significant effect of the treatment on the residual stress was found. MDPI 2020-09-09 /pmc/articles/PMC7558138/ /pubmed/32917049 http://dx.doi.org/10.3390/ma13184002 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Skowron, Konrad
Dryzek, Ewa
Wróbel, Mirosław
Nowak, Paweł
Marciszko-Wiąckowska, Marianna
Le Joncour, Léa
François, Manuel
Panicaud, Benoit
Baczmański, Andrzej
Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods
title Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods
title_full Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods
title_fullStr Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods
title_full_unstemmed Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods
title_short Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods
title_sort gradient microstructure induced by surface mechanical attrition treatment (smat) in magnesium studied using positron annihilation spectroscopy and complementary methods
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7558138/
https://www.ncbi.nlm.nih.gov/pubmed/32917049
http://dx.doi.org/10.3390/ma13184002
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