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The role of pin eccentricity in friction stir welding of Al‑Mg‑Si alloy sheets : microstructural evolution and mechanical properties

In friction stir welding, geometrical and motion features of the tool or pin greatly influence the interaction between the tool and workpiece as well as the resulting joint microstructure and mechanical properties. In order to enhance the material flow by optimizing the tool geometrical features, a...

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Main Authors: Hou, Wentao, Ding, Yuquan, Huang, Guoqaing Qiang, Huda, Nazmul, Luqman Hakim, Ahmad Shah, Piao, Zhongyu, Shen, Yifu, Shen, Zhikang, Gerlich, Adrian P.
Format: Article
Language:English
English
Published: Springer Science and Business Media Deutschland GmbH 2022
Subjects:
T Technology (General)
TA Engineering (General). Civil engineering (General)
TJ Mechanical engineering and machinery
TL Motor vehicles. Aeronautics. Astronautics
Online Access:http://umpir.ump.edu.my/id/eprint/40133/1/The%20role%20of%20pin%20eccentricity%20in%20friction%20stir%20welding.pdf
http://umpir.ump.edu.my/id/eprint/40133/2/The%20role%20of%20pin%20eccentricity%20in%20friction%20stir%20welding%20of%20Al%E2%80%91Mg%E2%80%91Si%20alloy%20sheets_Microstructural%20evolution%20and%20mechanical%20properties_ABS.pdf
http://umpir.ump.edu.my/id/eprint/40133/
https://doi.org/10.1007/s00170-022-09793-x
https://doi.org/10.1007/s00170-022-09793-x
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spelling my.ump.umpir.401332024-02-05T07:04:33Z http://umpir.ump.edu.my/id/eprint/40133/ The role of pin eccentricity in friction stir welding of Al‑Mg‑Si alloy sheets : microstructural evolution and mechanical properties Hou, Wentao Ding, Yuquan Huang, Guoqaing Qiang Huda, Nazmul Luqman Hakim, Ahmad Shah Piao, Zhongyu Shen, Yifu Shen, Zhikang Gerlich, Adrian P. T Technology (General) TA Engineering (General). Civil engineering (General) TJ Mechanical engineering and machinery TL Motor vehicles. Aeronautics. Astronautics In friction stir welding, geometrical and motion features of the tool or pin greatly influence the interaction between the tool and workpiece as well as the resulting joint microstructure and mechanical properties. In order to enhance the material flow by optimizing the tool geometrical features, a new strategy was proposed in this study to introduce eccentric motion by offsetting the pin from the tool shoulder, and thin Al–Mg-Si aluminum alloy plates were friction stir welded by varying the pin eccentricity. The material flow and mixing characteristic were analyzed by optical microscope and tracer material method. The grain size and micro-texture of the stir zone were analyzed by electron backscatter diffraction. Uniaxial tensile tests and digital image correlation were conducted to evaluate the mechanical properties and observe the in situ strain evolution. The results show that pin eccentricity has a positive effect on promoting the material flow and grain refinement in the stir zone. The texture intensity was increased as pin eccentricity was introduced, and the dominant texture component converted from C {001} < 110 > (without eccentricity) to B /B ¯ {112} < 110 > when eccentric pin was used. However, no discerning change can be seen in the thermal history between samples. Despite the variation in softening of the stir zone with eccentricity, the ultimate tensile strength change was negligible. The average ultimate tensile strength reached approximately 198 MPa regardless of the pin eccentricity, and all joints fractured at the heat-affected zone. However, the softened stir zone caused by pin eccentricity resulted in an obvious increase in the joint elongation. It can be concluded that pin eccentricity significantly improved the material flow and grain refinement in the stir zone as well as enhanced the toughness of the weld joint. Springer Science and Business Media Deutschland GmbH 2022-08 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/40133/1/The%20role%20of%20pin%20eccentricity%20in%20friction%20stir%20welding.pdf pdf en http://umpir.ump.edu.my/id/eprint/40133/2/The%20role%20of%20pin%20eccentricity%20in%20friction%20stir%20welding%20of%20Al%E2%80%91Mg%E2%80%91Si%20alloy%20sheets_Microstructural%20evolution%20and%20mechanical%20properties_ABS.pdf Hou, Wentao and Ding, Yuquan and Huang, Guoqaing Qiang and Huda, Nazmul and Luqman Hakim, Ahmad Shah and Piao, Zhongyu and Shen, Yifu and Shen, Zhikang and Gerlich, Adrian P. (2022) The role of pin eccentricity in friction stir welding of Al‑Mg‑Si alloy sheets : microstructural evolution and mechanical properties. International Journal of Advanced Manufacturing Technology, 121 (11-12). pp. 7661-7675. ISSN 0268-3768. (Published) https://doi.org/10.1007/s00170-022-09793-x https://doi.org/10.1007/s00170-022-09793-x
institution Universiti Malaysia Pahang Al-Sultan Abdullah
building UMPSA Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang Al-Sultan Abdullah
content_source UMPSA Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
English
topic T Technology (General)
TA Engineering (General). Civil engineering (General)
TJ Mechanical engineering and machinery
TL Motor vehicles. Aeronautics. Astronautics
spellingShingle T Technology (General)
TA Engineering (General). Civil engineering (General)
TJ Mechanical engineering and machinery
TL Motor vehicles. Aeronautics. Astronautics
Hou, Wentao
Ding, Yuquan
Huang, Guoqaing Qiang
Huda, Nazmul
Luqman Hakim, Ahmad Shah
Piao, Zhongyu
Shen, Yifu
Shen, Zhikang
Gerlich, Adrian P.
The role of pin eccentricity in friction stir welding of Al‑Mg‑Si alloy sheets : microstructural evolution and mechanical properties
description In friction stir welding, geometrical and motion features of the tool or pin greatly influence the interaction between the tool and workpiece as well as the resulting joint microstructure and mechanical properties. In order to enhance the material flow by optimizing the tool geometrical features, a new strategy was proposed in this study to introduce eccentric motion by offsetting the pin from the tool shoulder, and thin Al–Mg-Si aluminum alloy plates were friction stir welded by varying the pin eccentricity. The material flow and mixing characteristic were analyzed by optical microscope and tracer material method. The grain size and micro-texture of the stir zone were analyzed by electron backscatter diffraction. Uniaxial tensile tests and digital image correlation were conducted to evaluate the mechanical properties and observe the in situ strain evolution. The results show that pin eccentricity has a positive effect on promoting the material flow and grain refinement in the stir zone. The texture intensity was increased as pin eccentricity was introduced, and the dominant texture component converted from C {001} < 110 > (without eccentricity) to B /B ¯ {112} < 110 > when eccentric pin was used. However, no discerning change can be seen in the thermal history between samples. Despite the variation in softening of the stir zone with eccentricity, the ultimate tensile strength change was negligible. The average ultimate tensile strength reached approximately 198 MPa regardless of the pin eccentricity, and all joints fractured at the heat-affected zone. However, the softened stir zone caused by pin eccentricity resulted in an obvious increase in the joint elongation. It can be concluded that pin eccentricity significantly improved the material flow and grain refinement in the stir zone as well as enhanced the toughness of the weld joint.
format Article
author Hou, Wentao
Ding, Yuquan
Huang, Guoqaing Qiang
Huda, Nazmul
Luqman Hakim, Ahmad Shah
Piao, Zhongyu
Shen, Yifu
Shen, Zhikang
Gerlich, Adrian P.
author_facet Hou, Wentao
Ding, Yuquan
Huang, Guoqaing Qiang
Huda, Nazmul
Luqman Hakim, Ahmad Shah
Piao, Zhongyu
Shen, Yifu
Shen, Zhikang
Gerlich, Adrian P.
author_sort Hou, Wentao
title The role of pin eccentricity in friction stir welding of Al‑Mg‑Si alloy sheets : microstructural evolution and mechanical properties
title_short The role of pin eccentricity in friction stir welding of Al‑Mg‑Si alloy sheets : microstructural evolution and mechanical properties
title_full The role of pin eccentricity in friction stir welding of Al‑Mg‑Si alloy sheets : microstructural evolution and mechanical properties
title_fullStr The role of pin eccentricity in friction stir welding of Al‑Mg‑Si alloy sheets : microstructural evolution and mechanical properties
title_full_unstemmed The role of pin eccentricity in friction stir welding of Al‑Mg‑Si alloy sheets : microstructural evolution and mechanical properties
title_sort role of pin eccentricity in friction stir welding of al‑mg‑si alloy sheets : microstructural evolution and mechanical properties
publisher Springer Science and Business Media Deutschland GmbH
publishDate 2022
url http://umpir.ump.edu.my/id/eprint/40133/1/The%20role%20of%20pin%20eccentricity%20in%20friction%20stir%20welding.pdf
http://umpir.ump.edu.my/id/eprint/40133/2/The%20role%20of%20pin%20eccentricity%20in%20friction%20stir%20welding%20of%20Al%E2%80%91Mg%E2%80%91Si%20alloy%20sheets_Microstructural%20evolution%20and%20mechanical%20properties_ABS.pdf
http://umpir.ump.edu.my/id/eprint/40133/
https://doi.org/10.1007/s00170-022-09793-x
https://doi.org/10.1007/s00170-022-09793-x
_version_ 1822924114325667840
score 13.232389

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