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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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) |
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7B50 high strength aluminum alloy Friction stir welding Thermal exposure Microstructure Mechanical properties Mining engineering. Metallurgy TN1-997 |
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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 |
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