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Effect of Rotation Speed to Welding Speed Ratio on Microstructure and Mechanical Behavior of Friction Stir Welded Aluminum– L ithium Alloy Joints
Author(s) -
Li Wenya,
Jiang Ruorong,
Zhang Zhihan,
Ma Yu'E
Publication year - 2013
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201300147
Subject(s) - materials science , microstructure , indentation hardness , welding , alloy , friction stir welding , metallurgy , rotational speed , ultimate tensile strength , composite material , joint (building) , structural engineering , physics , quantum mechanics , engineering
2198 Al–Li alloy welds were performed by friction stir welding (FSW) to investigate the influence of the ratio of rotation speed to welding speed ( ω / ν ) on joint microstructure, microhardness, and tensile properties. Transmission electron microscopy (TEM) was used to reveal the precipitate type across the weld cross‐section. Results show that ω / ν has a little impact on both macroscopic morphology and microstructure of joints. Dissolution of precipitates has occurred in the weld nugget (WN). The density of T 1 phase and its size in the WN decrease remarkably. Changes to the T 1 phase are linked to a significant reduction in microhardness across the weld. With increasing ω / ν the microhardness of the joints decreases. The value of ω / ν also has impact on the fracture mode of the joints as well as the elongation.