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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,...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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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. |
format | Online Article Text |
id | pubmed-7558138 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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