The effect of changing chemical composition in dissimilar Mg/Al friction stir welded butt joints using zinc interlayer
In this study, solid state joining technology of friction stir welding (FSW) was carried out for Al and Mg butt joints. To improve the microstructural characteristics of the banded structure zone, before to the FSW process, a Zn interlayer was also inserted in the butt joints. Optimal conditions for...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/119015 |
| Acceso en línea: | https://hdl.handle.net/2117/119015 https://dx.doi.org/10.1016/j.jmapro.2018.05.029 |
| Access Level: | acceso abierto |
| Palabra clave: | Dissimilar welding Microstructure Materials--Mechanical properties Dissimilar FSW Zn Interlayer Al/Mg butt joint Intermetallics Microstructure Mechanical properties Microestructura Materials -- Propietats mecàniques Àrees temàtiques de la UPC::Enginyeria dels materials |
| Sumario: | In this study, solid state joining technology of friction stir welding (FSW) was carried out for Al and Mg butt joints. To improve the microstructural characteristics of the banded structure zone, before to the FSW process, a Zn interlayer was also inserted in the butt joints. Optimal conditions for friction stir welding were obtained using a combination of two travel speeds (25 and 35¿mm/min) and three rotation speeds (550, 600 and 650¿rpm). Mg-Zn and Mg-Al-Zn IMCs, Al solid solution and residual Zn were the most common phases in the stirred zone, eliminating Al-Mg intermetallic formation. The joint fabricated at 35¿mm/min and 600¿rpm, in which tensile strength of the weld improved from 141 to 175¿MPa and an elongation from 0.7 to 1.9 was achieved, gave the maximum mechanical properties compared with the Zn free sample FSWed under identical conditions. The fracture micrographs were compatible with the corresponding ductility results and the fracture surfaces of Zn added samples possessed a fine texture combining brittle and ductile fracture features. Meanwhile, the hardness level was lower than that of the Zn free sample because of the change in the IMCs composition of the Zn added samples. |
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