Effect of thermal exposure on microstructure and mechanical properties of friction stir welding 7B50-T7451 aluminium alloy thick plate joint

In the present work, thermal exposure was performed on the 7B50-T7451 aluminium alloy friction stir welding (FSW) joints at different temperatures (150 °C, 175 °C and 220 °C) for 200 h. The results show that the microstructure and mechanical properties of as-welded joints along the thickness directi...

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Autores principales: Weifeng Xu, Huan Wang, Hongjian Lu, Yuli Liu, Jihong Dong
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Lenguaje:EN
Publicado: Elsevier 2021
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Acceso en línea:https://doaj.org/article/dd61730856f94c2f8d725437f3e25b20
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spelling oai:doaj.org-article:dd61730856f94c2f8d725437f3e25b202021-12-04T04:34:29ZEffect of thermal exposure on microstructure and mechanical properties of friction stir welding 7B50-T7451 aluminium alloy thick plate joint2238-785410.1016/j.jmrt.2021.11.082https://doaj.org/article/dd61730856f94c2f8d725437f3e25b202021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421013612https://doaj.org/toc/2238-7854In the present work, thermal exposure was performed on the 7B50-T7451 aluminium alloy friction stir welding (FSW) joints at different temperatures (150 °C, 175 °C and 220 °C) for 200 h. The results show that the microstructure and mechanical properties of as-welded joints along the thickness direction of the plate are heterogeneous. The hardness and strength of FSW joints decrease while the elongation continuously increases with increasing thermal exposure temperature. Compared with the base material, the joints present much higher hardening capacity which is further increased with increasing temperature. The precipitates in the heat-affected zone (HAZ) exhibit continuous coarsening and the precipitate distribution becomes broader as the temperature rises. The transformation from η′ phase to η phase is obvious at 220 °C. The weld nugget zone (WNZ) re-precipitates a large number of nano-scale η particles subjected to 200 h thermal exposure at 150 °C and re-precipitated η phase in WNZ of the double-sided joint has reached micron-sized at 175 °C and 220 °C. When exposed at different temperatures, all FSW joints show typical ductile fracture features. Fracture positions at different thermal exposure temperatures are inconsistent and this variation is closely related to different microstructural characteristics.Weifeng XuHuan WangHongjian LuYuli LiuJihong DongElsevierarticle7B50 high strength aluminum alloyFriction stir weldingThermal exposureMicrostructureMechanical propertiesMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 6415-6433 (2021)
institution DOAJ
collection DOAJ
language EN
topic 7B50 high strength aluminum alloy
Friction stir welding
Thermal exposure
Microstructure
Mechanical properties
Mining engineering. Metallurgy
TN1-997
spellingShingle 7B50 high strength aluminum alloy
Friction stir welding
Thermal exposure
Microstructure
Mechanical properties
Mining engineering. Metallurgy
TN1-997
Weifeng Xu
Huan Wang
Hongjian Lu
Yuli Liu
Jihong Dong
Effect of thermal exposure on microstructure and mechanical properties of friction stir welding 7B50-T7451 aluminium alloy thick plate joint
description In the present work, thermal exposure was performed on the 7B50-T7451 aluminium alloy friction stir welding (FSW) joints at different temperatures (150 °C, 175 °C and 220 °C) for 200 h. The results show that the microstructure and mechanical properties of as-welded joints along the thickness direction of the plate are heterogeneous. The hardness and strength of FSW joints decrease while the elongation continuously increases with increasing thermal exposure temperature. Compared with the base material, the joints present much higher hardening capacity which is further increased with increasing temperature. The precipitates in the heat-affected zone (HAZ) exhibit continuous coarsening and the precipitate distribution becomes broader as the temperature rises. The transformation from η′ phase to η phase is obvious at 220 °C. The weld nugget zone (WNZ) re-precipitates a large number of nano-scale η particles subjected to 200 h thermal exposure at 150 °C and re-precipitated η phase in WNZ of the double-sided joint has reached micron-sized at 175 °C and 220 °C. When exposed at different temperatures, all FSW joints show typical ductile fracture features. Fracture positions at different thermal exposure temperatures are inconsistent and this variation is closely related to different microstructural characteristics.
format article
author Weifeng Xu
Huan Wang
Hongjian Lu
Yuli Liu
Jihong Dong
author_facet Weifeng Xu
Huan Wang
Hongjian Lu
Yuli Liu
Jihong Dong
author_sort Weifeng Xu
title Effect of thermal exposure on microstructure and mechanical properties of friction stir welding 7B50-T7451 aluminium alloy thick plate joint
title_short Effect of thermal exposure on microstructure and mechanical properties of friction stir welding 7B50-T7451 aluminium alloy thick plate joint
title_full Effect of thermal exposure on microstructure and mechanical properties of friction stir welding 7B50-T7451 aluminium alloy thick plate joint
title_fullStr Effect of thermal exposure on microstructure and mechanical properties of friction stir welding 7B50-T7451 aluminium alloy thick plate joint
title_full_unstemmed Effect of thermal exposure on microstructure and mechanical properties of friction stir welding 7B50-T7451 aluminium alloy thick plate joint
title_sort effect of thermal exposure on microstructure and mechanical properties of friction stir welding 7b50-t7451 aluminium alloy thick plate joint
publisher Elsevier
publishDate 2021
url https://doaj.org/article/dd61730856f94c2f8d725437f3e25b20
work_keys_str_mv AT weifengxu effectofthermalexposureonmicrostructureandmechanicalpropertiesoffrictionstirwelding7b50t7451aluminiumalloythickplatejoint
AT huanwang effectofthermalexposureonmicrostructureandmechanicalpropertiesoffrictionstirwelding7b50t7451aluminiumalloythickplatejoint
AT hongjianlu effectofthermalexposureonmicrostructureandmechanicalpropertiesoffrictionstirwelding7b50t7451aluminiumalloythickplatejoint
AT yuliliu effectofthermalexposureonmicrostructureandmechanicalpropertiesoffrictionstirwelding7b50t7451aluminiumalloythickplatejoint
AT jihongdong effectofthermalexposureonmicrostructureandmechanicalpropertiesoffrictionstirwelding7b50t7451aluminiumalloythickplatejoint
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