Effects of Ultrashort Pulsed Direct Laser Writing on Ni/Al Reactive Multilayer Foils

Reactive multilayer foils (RMFs) for joining processes have attracted a great deal of attention over the last few years. They are capable of exothermic self-propagating reactions and can serve as localized heat sources for joining applications when ignited by suitable means. Using short and ultrasho...

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Bibliographic Details
Published inApplied sciences Vol. 13; no. 7; p. 4313
Main Authors Martins, Maria Amélia, Müller, Daniel Wyn, Schmauch, Jörg, Glaser, Marcus, Bergmann, Jean Pierre, Mücklich, Frank, Pauly, Christoph
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.04.2023
Subjects
Ablation
Adhesive bonding
Aerospace engineering
Aerospace industry
Automotive engineering
Direct laser writing
Electrical engineering
Exothermic reactions
femtosecond ablation
Foils
Heat
Heat affected zone
Heat sources
Heat transfer
Instrument industry
Investigations
Ion beams
Joining
Laser beam welding
Laser machining
Lasers
Machining
Micromachining
Multilayers
Ni/Al
Parameters
Polymers
Pulse duration
reactive multilayers
Self propagation
Sensors
Spectrum analysis
Thermal stress
Transmission electron microscopy
ultrashort pulsed laser
Ultrashort pulsed lasers
Japan
Germany
United States > US
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Summary:Reactive multilayer foils (RMFs) for joining processes have attracted a great deal of attention over the last few years. They are capable of exothermic self-propagating reactions and can serve as localized heat sources for joining applications when ignited by suitable means. Using short and ultrashort pulsed lasers with carefully selected parameters, cutting and shaping of RMFs makes it possible to tailor heat release characteristics without triggering the reaction. The present study is an investigation of microstructural changes induced by femtosecond laser machining of a commercially available Ni/Al-based RMF. The effects of the specific laser parameters pulse duration and repetition rate on the heat-affected zone (HAZ) are investigated by scanning and transmission electron microscopy. Debris consisting of oxide deposits can be found at a distance of several tens of microns from the cut edge. A negligible HAZ extending to less than 100 nm was observed for all parameters tested and no signs of ignition of a self-propagating reaction were observed. These results underline the suitability of femtosecond lasers for metal machining with minimal heat input.
ISSN:2076-3417
2076-3417
DOI:10.3390/app13074313