Non-equilibrium energy transfer and phase change during intense picosecond laser-metal interactions
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2006
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| Online Access: | http://hdl.handle.net/1721.1/34346 |
| _version_ | 1826188562416009216 |
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| author | Kuo, Long-Sheng, 1969- |
| author2 | Taiqing Qiu. |
| author_facet | Taiqing Qiu. Kuo, Long-Sheng, 1969- |
| author_sort | Kuo, Long-Sheng, 1969- |
| collection | MIT |
| description | Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001. |
| first_indexed | 2024-09-23T08:01:19Z |
| format | Thesis |
| id | mit-1721.1/34346 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T08:01:19Z |
| publishDate | 2006 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/343462019-04-09T16:09:17Z Non-equilibrium energy transfer and phase change during intense picosecond laser-metal interactions Kuo, Long-Sheng, 1969- Taiqing Qiu. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Mechanical Engineering. Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001. Includes bibliographical references (leaves 55-57). Laser interactions with metals involve absorption of photon energy by electrons, energy coupling between electrons and the lattice, and energy transport by diffusion of electrons and lattice vibrations. During picosecond laser irradiation of metal films, electrons and the lattice are not in thermal equilibrium. On the other hand, rapid laser heating produces a large degree of superheating and undercooling during melting and solidification. First, this work investigates experimentally non-equilibrium heating processes during intense picosecond laser heating of metal films. Results show excellent agreement with predictions of the two-step radiation heating model. Second, this work develops a general model to characterize both non-equilibrium energy deposition and phase change processes. The predictions show that the non-equilibrium heating processes significantly increase the laser melting threshold, enlarge the thermal-affected region, reduce the lattice temperature rise, prolong the phase change duration, and reduce the solidification speed. These results are important for materials processing using ultrashort pulsed lasers. by Long-Sheng Kuo. S.M. 2006-11-06T18:15:21Z 2006-11-06T18:15:21Z 2001 2001 Thesis http://hdl.handle.net/1721.1/34346 49014623 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 57 leaves 2020346 bytes 2022639 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Mechanical Engineering. Kuo, Long-Sheng, 1969- Non-equilibrium energy transfer and phase change during intense picosecond laser-metal interactions |
| title | Non-equilibrium energy transfer and phase change during intense picosecond laser-metal interactions |
| title_full | Non-equilibrium energy transfer and phase change during intense picosecond laser-metal interactions |
| title_fullStr | Non-equilibrium energy transfer and phase change during intense picosecond laser-metal interactions |
| title_full_unstemmed | Non-equilibrium energy transfer and phase change during intense picosecond laser-metal interactions |
| title_short | Non-equilibrium energy transfer and phase change during intense picosecond laser-metal interactions |
| title_sort | non equilibrium energy transfer and phase change during intense picosecond laser metal interactions |
| topic | Mechanical Engineering. |
| url | http://hdl.handle.net/1721.1/34346 |
| work_keys_str_mv | AT kuolongsheng1969 nonequilibriumenergytransferandphasechangeduringintensepicosecondlasermetalinteractions |