Strain Accumulation and Microstructural Evolution During Friction Stir Welding of Pure Magnesium

Li, Zhuoliang; Hua, Ding; Chen, Yu; Li, Jizhong; Liu, Lizhong

doi:10.3389/fmats.2020.603464

Cited by 2 publications

(1 citation statement)

References 34 publications

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“…The unique characteristic of FSW is extremely large true strains, which may reach a magnitude of ~80 [39]. Accordingly, the application of the conventional Lagrangian FEM approach for simulation of the thermo-mechanical aspects of FSW is challenging because of the severe distortion of meshing elements [40][41][42]. To achieve acceptable accuracy of calculations in this case, it is necessary to use meshes with an extremely small element size, and to perform frequent re-meshing during the analysis.…”

Section: Broad Aspects Of the Simulation Modelmentioning

confidence: 99%

Interfacial Microstructure Produced during Dissimilar AA6013/Ti-6Al-4V Friction Stir Lap Welding under Zero-Penetration Condition

Kalinenko,

Dolzhenko,

Malopheyev

et al. 2023

Metals

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The purpose of this study was to investigate the interfacial microstructure that was produced during dissimilar friction stir lap welding (FSW) of 6013 aluminum alloy and Ti-6Al-4V. FSW was conducted under a zero-penetration condition, i.e., the welding tool was plunged exclusively into the upper (aluminum) plate of the dissimilar lap joint. To facilitate the interpretation of microstructural processes, finite element modeling (FEM) was applied to evaluate the temperature field within the weld zone. The FEM simulation revealed a very sharp temperature gradient across the dissimilar interface. This effect was attributed to the generation of FSW heat exclusively within the aluminum part and a relatively low thermal conductivity of titanium. The abrupt temperature drop on the titanium side imposed a strict limitation on the diffusion penetration of aluminum and thus resulted in a relatively thin (~0.5 μm) and discontinuous intermetallic compound. Due to the complex chemical composition of the FSWed aluminum alloy, the diffusion processes also involved alloying elements. Consequently, the evolved intermetallic compound had a complicated chemical composition, with the principal elements being aluminum, titanium, silicon, manganese, and magnesium.

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