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Embrittlement Due to Excess Heat Input into Friction Stir Processed 7075 Alloy
The grain size of high strength 7075 hot-rolled aluminum plates was refined by a friction stir process (FSP) to improve their mechanical properties. The results of the tensile ductility tests, which were conducted at various tool rotational speeds, in the friction stir zone indicate significant tens...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6357092/ https://www.ncbi.nlm.nih.gov/pubmed/30634709 http://dx.doi.org/10.3390/ma12020227 |
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author | Ku, Ming-Hsiang Hung, Fei-Yi Lui, Truan-Sheng |
author_facet | Ku, Ming-Hsiang Hung, Fei-Yi Lui, Truan-Sheng |
author_sort | Ku, Ming-Hsiang |
collection | PubMed |
description | The grain size of high strength 7075 hot-rolled aluminum plates was refined by a friction stir process (FSP) to improve their mechanical properties. The results of the tensile ductility tests, which were conducted at various tool rotational speeds, in the friction stir zone indicate significant tensile ductility loss, which even resulted in a ductile-to-brittle transition (DBT). DBT depends on the tool rotational speed. Our 1450 rpm specimens showed large data fluctuation in the tensile ductility and the location of the fracture controlled the formation of friction stir induced bands (FSIB). The crack initiation site located at FSIB was due to the tool rotational speed (1670 rpm). A higher heat-input causes the formation of FSIB, which is accompanied with micro-voids. This contributes significantly to tensile cracking within the stir zone after the application of the aging treatment. This investigation aimed to determine the dominant factor causing tensile ductility loss at the stir zone, which is the major restriction preventing further applications. |
format | Online Article Text |
id | pubmed-6357092 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-63570922019-02-04 Embrittlement Due to Excess Heat Input into Friction Stir Processed 7075 Alloy Ku, Ming-Hsiang Hung, Fei-Yi Lui, Truan-Sheng Materials (Basel) Article The grain size of high strength 7075 hot-rolled aluminum plates was refined by a friction stir process (FSP) to improve their mechanical properties. The results of the tensile ductility tests, which were conducted at various tool rotational speeds, in the friction stir zone indicate significant tensile ductility loss, which even resulted in a ductile-to-brittle transition (DBT). DBT depends on the tool rotational speed. Our 1450 rpm specimens showed large data fluctuation in the tensile ductility and the location of the fracture controlled the formation of friction stir induced bands (FSIB). The crack initiation site located at FSIB was due to the tool rotational speed (1670 rpm). A higher heat-input causes the formation of FSIB, which is accompanied with micro-voids. This contributes significantly to tensile cracking within the stir zone after the application of the aging treatment. This investigation aimed to determine the dominant factor causing tensile ductility loss at the stir zone, which is the major restriction preventing further applications. MDPI 2019-01-10 /pmc/articles/PMC6357092/ /pubmed/30634709 http://dx.doi.org/10.3390/ma12020227 Text en © 2019 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 Ku, Ming-Hsiang Hung, Fei-Yi Lui, Truan-Sheng Embrittlement Due to Excess Heat Input into Friction Stir Processed 7075 Alloy |
title | Embrittlement Due to Excess Heat Input into Friction Stir Processed 7075 Alloy |
title_full | Embrittlement Due to Excess Heat Input into Friction Stir Processed 7075 Alloy |
title_fullStr | Embrittlement Due to Excess Heat Input into Friction Stir Processed 7075 Alloy |
title_full_unstemmed | Embrittlement Due to Excess Heat Input into Friction Stir Processed 7075 Alloy |
title_short | Embrittlement Due to Excess Heat Input into Friction Stir Processed 7075 Alloy |
title_sort | embrittlement due to excess heat input into friction stir processed 7075 alloy |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6357092/ https://www.ncbi.nlm.nih.gov/pubmed/30634709 http://dx.doi.org/10.3390/ma12020227 |
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