| Autor: |
Mark Anderson, Graham Kaufman, Aaron Ediger, Dennis Alexander, Craig Zuhlke, Jeffrey E. Shield |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Materials Today Advances, Vol 19, Iss , Pp 100412- (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2590-0498 |
| DOI: |
10.1016/j.mtadv.2023.100412 |
| Popis: |
Modification of surfaces with ultrashort pulse laser surface processing techniques has shown to enhance surface properties for numerous applications. To more effectively tailor material properties, there needs to be a better understanding of the self-organization processes that lead to the quasi-periodic micro- and nano-scale surface features. In this paper, a multi-cross-section technique was used to gain understanding of how the surface features form during processing of copper with picosecond pulses. Incremental cross-sections were performed starting at the leading edge of the final laser pass. Each subsequent cross-section moved farther away from the leading edge and towards the final microstructure seen within the center of the processed region. Utilizing the cross-sectional and laser confocal data combined with the 2D projection of the Gaussian beam profile, a progression of formation mechanisms that includes a balance of ablation, redeposition, shielding, and sintering is explained. This formation mechanism progressed with initial ablation of copper that redeposits onto the surface. The redeposited copper then acts as a protection against the high fluence portion of the laser beam allowing for the mounds to grow. The redeposited copper particles are then sintered by the tail-end of the Gaussian profile into a porous layer. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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