Formation of conical micro-spikes on various metal surfaces (316L stainless steel, Ti-6Al-4V, and Al5754) under femtosecond irradiation at high repetition rate is reported. Two types of micro-cone morphologies formed at these high repetition rates under high and low-fluence conditions were clearly distinguished. At low fluence (near the ablation thresholds), conical spikes with low aspect ratio and non-uniform distribution forms through random evolution. At high fluence, semi-uniform conical spikes with higher aspect ratios are formed through simultaneous progressive evolution procedure with increasing the number of scans. Experimental results are presented showing the progression of random micro-spike formation to uniform micro-spikes as fluence increases and how scan-speed affects the size of the spikes. For both formation processes, the scan speed is found to be an effective parameter to control the micro-cone size (or micro-cone number density).
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ICALEO 2015: 34th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing
October 18–22, 2015
Atlanta, Georgia, USA
ISBN:
978-1-940168-05-0
PROCEEDINGS PAPER
Formation mechanism of micro-spikes on various metals with femtosecond laser pulses
Dong-Hyuck Kam;
Dong-Hyuck Kam
1
Welding & Joining R&BD Group, Korea Institute of Industrial Technology
, Incheon 406-840, Korea
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Jyoti Mazumder;
Jyoti Mazumder
2
Center for Lasers and Plasmas in Advanced Manufacturing, University of Michigan at Ann Arbor
, Michigan 48109 USA
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Jedo Kim
Jedo Kim
3
Department of Mechanical Engineering, Pukyong National University
, Busan, 608-739, Korea
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Published Online:
October 01 2015
Citation
Dong-Hyuck Kam, Jyoti Mazumder, Jedo Kim; October 18–22, 2015. "Formation mechanism of micro-spikes on various metals with femtosecond laser pulses." Proceedings of the ICALEO 2015: 34th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. ICALEO 2015: 34th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Atlanta, Georgia, USA. (pp. pp. 83-88). ASME. https://doi.org/10.2351/1.5063233
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