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Approaching non-destructive surface chemical analysis of CMSX-4 superalloy with double-pulsed laser induced breakdown spectroscopy |
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| Authors: | Joel P. McDonald Dipak K. Das John A. Nees Tresa M. Pollock Steven M. Yalisove |
| Affiliation: | aApplied Physics Program, University of Michigan, 2477 Randall Laboratory, Ann Arbor, Michigan 48109-1120, USA bDepartment of Materials Science and Engineering, University of Michigan, 2200 Hayward Ave., Ann Arbor, Michigan 48109, USA cCenter for Ultrafast Optical Science, University of Michigan, 2200 Bonisteel Blvd., Ann Arbor, MI 48109, USA |
| Abstract: | Laser induced breakdown spectroscopy (LIBS) was performed on the CMSX-4 Ni-based superalloy using a femtosecond pulsed laser. An orthogonal double-pulse technique was used to minimize surface damage associated with LIBS. With this technique, the depth of ablation craters was reduced from 200 nm for single-pulse LIBS down to less than 60 nm using orthogonal double-pulse LIBS. The technique also allowed the average velocity of the ablated material to be determined, which ranged from 4720 ± 560 m/s at a pump laser fluence of 3.1 J/cm2 to 8150 ±1800 m/s at 10.1 J/cm2. |
| Keywords: | LIBS Femtosecond Superalloy Double-pulse |
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