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Mechanisms of ultrashort laser ablation in CrMnFeCoNi high-entropy alloy and stainless steel
| Citace: |
REDKA, D.; SPELLAUGE, M.; SANDNER, CH.; MINÁR, J.; HUBER, HP. Mechanisms of ultrashort laser ablation in CrMnFeCoNi high-entropy alloy and stainless steel. Applied Surface Science, 2025, roč. 686, č. MAR 30 2025, s. nestránkováno. ISSN 0169-4332.
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| Druh: | ČLÁNEK |
| Jazyk publikace: | eng |
| Anglický název: | Mechanisms of ultrashort laser ablation in CrMnFeCoNi high-entropy alloy and stainless steel |
| Rok vydání: | 2025 |
| Autoři: | David Redka M.Sc. , Maximilian Spellauge , Christian Sandner , prof. Dr. Jan Minár , Dr. Heinz Paul Huber |
| Abstrakt EN: | High-entropy alloys represent a promising class of materials with potential applications across engineering fields. This study aims to investigate the ultrashort pulse laser ablation dynamics of the high-entropy alloy CrMnFeCoNi in comparison to the conventional austenitic stainless steel AISI 304, focusing on correlating time-resolved pump-probe and post-ablation measurements. Using the transfer-matrix method with pump-probe microscopy, we quantitatively analyze spallation and phase explosion dynamics, linking transient reflectance changes to material-specific ablation mechanisms. Our findings reveal distinct differences in absorption within the ablation plume, with AISI 304 exhibiting a higher absorption of 0.35 compared to 0.2 for CrMnFeCoNi at three times the ablation threshold fluence. This difference indicates a stronger photothermal contribution in stainless steel, accounting for its lower ablation efficiency. Furthermore, the contrast of Newton rings can be well explained by the spallation depth, derived from post-ablation ablation depth measurements. Additionally, we provide insight into the birth (detachment at 10 ps) and death (dissolution between 3 ns and 5 ns) of the spallation layer, enhancing our understanding of transient ablation dynamics. The comprehensive analysis of the transient ablation dynamics, along previously reported post-ablation metrics, provides valuable insights into the laser processing of high-entropy alloys with stainless steel as reference. |
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