Effect of cooling conditions on microstructure and mechanical properties of friction stir welded 7055 aluminium alloy joints
| Autor: | Yulong Wu, Xiaorong Zhou, Shengdan Liu, Huaqiang Lin |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Heat-affected zone
Materials science microstructure 02 engineering and technology mechanical properties 7055 aluminium alloy 01 natural sciences 0103 physical sciences Ultimate tensile strength Water cooling Aluminium alloy Friction stir welding General Materials Science Composite material cooling conditions Tensile testing 010302 applied physics Air cooling Mechanical Engineering 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Mechanics of Materials visual_art visual_art.visual_art_medium friction stir welding 0210 nano-technology |
| Zdroj: | Lin, H, Wu, Y, Liu, S & Zhou, X 2018, ' Effect of cooling conditions on microstructure and mechanical properties of friction stir welded 7055 aluminium alloy joints ', Materials Characterization, vol. 141, pp. 74-85 . https://doi.org/10.1016/j.matchar.2018.04.029 |
| ISSN: | 1044-5803 |
| DOI: | 10.1016/j.matchar.2018.04.029 |
| Popis: | The microstructure and mechanical properties of friction stir welded 7055 aluminium alloy under air cooling and water cooling were investigated by means of hardness and tensile testing, optical microscopy and transmission electron microscopy. Water cooling results in reduced softening in the weld zone and therefore higher tensile strength compared to air cooling. Fracture generally occurs within the thermo-mechanically affected zone (TMAZ) and heat affected zone (HAZ) on the retreating side in joints welded under air cooling but shifts towards the TMAZ and nugget zone (NZ) in the joints welded under water cooling. The fracture surfaces are generally flat for the air-cooled joint, but exhibits a zig-zag feature for the water-cooled joint. The mechanical behaviour of the weld has been discussed in light of the change in grain structure and precipitation in the NZ, TMAZ and HAZ caused by cooling conditions. |
| Databáze: | OpenAIRE |
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