Morphology and formation mechanism of equiaxed grains along the fusion boundary in Al–Li alloy weld seam
| Autor: | Xiaosong Feng, Xiaohong Zhan, Haisong Yu, Peiyun Xia, Zhengdong Wang, Ling Xia |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Equiaxed crystals Fusion Materials science Polymers and Plastics Butt welding Alloy Metals and Alloys Laser beam welding 02 engineering and technology Welding engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Biomaterials Temperature gradient law 0103 physical sciences engineering Composite material 0210 nano-technology |
| Zdroj: | Materials Research Express. 5:116523 |
| ISSN: | 2053-1591 |
| DOI: | 10.1088/2053-1591/aadddb |
| Popis: | A band of equiaxed grains is found near the fusion boundary of Al–Li alloy weld seam. In order to clarify the formation mechanism of this equiaxed grain zone (EQZ), experimental investigations and numerical simulation of laser butt welding for 2060 Al–Li alloy are conducted in this paper. The macrostructures and microstructures of welded joint under different welding parameters are evaluated. In addition, a 3D finite element model with the same dimension as the experimental workpiece is established and the temperature field of welded panel during laser welding process is simulated. The analysis results indicate that the formation of EQZ is related to the temperature gradient at the fusion boundary. With the increase of heat input, the undercooling rate increases accordingly, making the grains in EQZ get coarser. |
| Databáze: | OpenAIRE |
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