Impact of initial temper of base metal on microstructure and mechanical properties of friction stir welded AA 7055 alloy
| Autor: | Yulong Wu, Huaqiang Lin, Shengdan Liu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Heat-affected zone
Materials science Alloy 02 engineering and technology Welding engineering.material 01 natural sciences law.invention law 0103 physical sciences Ultimate tensile strength Aluminium alloy Friction stir welding General Materials Science Composite material Base metal 010302 applied physics Mechanical Engineering 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Mechanics of Materials visual_art engineering visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Materials Characterization. 146:159-168 |
| ISSN: | 1044-5803 |
| DOI: | 10.1016/j.matchar.2018.09.043 |
| Popis: | AA 7055-T6 and AA 7055-T4 aluminium alloy sheets were friction stir welded to investigate the impact of initial base metal temper on microstructure, hardness and tensile properties of the joints. In the joint of alloy in T6 temper (T6-joint), the hardness of the weld zone is lower than that of base metal; in the joint of alloy in T4 temper (T4-joint), however, some regions in the heat affected zone exhibit higher hardness than base metal. The weld nugget zone in T6-joint exhibits slightly lower hardness compared with that in T4-joint. The hardness minima is slightly higher in T4-joint than in T6-joint. T4-joint exhibits higher yield strength, ultimate tensile strength and elongation compared with T6-joint. Based on microstructure examination by transmission electron microscopy, the impact of initial precipitate state on precipitation behavior in the weld nugget zone, thermo-mechanically affected zone and heat affected zone during friction stir welding and mechanical properties of the joints is discussed. |
| Databáze: | OpenAIRE |
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