| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7893658 | Corrosion Science | 2018 | 15 Pages |
Abstract
In the present study, the microstructure and corrosion behaviour of laser beam welded 2A97 alloy are investigated. Welding process results in segregation of alloying elements within the fusion zone and, consequently, formation of T1 (Al2CuLi), TB (Al7Cu4Li) and R (Al5CuLi3) phase interdendritic intermetallics. The distribution of the interdendritic intermetallics is non-uniform across the weld. In NaCl solution, corrosion initiates at interdendritic intermetallic with selective dissolution of Al and Li, resulting in a copper-rich remnant, which subsequently acts as effective cathode supporting the dissolution of alloy matrix. The equiaxed dendrite zone at the centre of the weld is most susceptible to corrosion.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Xinxin Zhang, Bing Liu, Xiaorong Zhou, Junjie Wang, Teruo Hashimoto, Chen Luo, Zhihua Sun, Zhihui Tang, Feng Lu,