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Significance Statement
Fabrication of micro-channels could be realized by various techniques including conventional and un-conventional techniques. Laser ablation is considered as well-known competitive process having the capability of producing micro-features in variety of engineering materials irrespective to the hardness and machinability of difficult-to-machine materials such as titanium, nickel and numerous aerospace alloy. One of the limitations of the laser ablation is the variation in micro-features sizes due to the thermal nature of the process. This problem is usually encountered when the micro-feature size to be generated by laser ablation ranges from tens of microns to few hundreds of microns. In the present study, various sizes of micro-channels are produced through nano-second Nd:YAG pulsed laser irradiated on titanium alloy. In terms of micro-channel sizes, it is evidenced that the wider sized micro-channels can be obtained with less amount of size variation while the narrow sized micro-channels exhibit high amount of variation. Micro-channel size features are characterized as channel’s top width, bottom width, depth and taper angle of side walls.
Figure Legend: Micro-channels of different sizes fabricated by Nd:YAG pulsed laser.
Journal Reference
Materials and Manufacturing Processes, Volume 30, Issue 11, 2015.
Naveed Ahmed 1,2,3,5, Saied Darwish 1,2,3, Abdulrahman M. Alahmari 1,2,3, Khayyam Salik 4
[expand title=”Show Affiliations”]- Princess Fatima Alnijiris’s Research Chair for Advanced Manufacturing Technology (FARCAMT), King Saud University, Riyadh – Saudi Arabia.
- Industrial Engineering Department, King Saud University, Riyadh – Saudi Arabia.
- Advanced Manufacturing Institute, King Saud University, Riyadh – Saudi Arabia.
- Mechanical Engineering Department, King Saud University, Riyadh – Saudi Arabia.
- Department of Industrial and Manufacturing Engineering, University of Engineering and Technology, Lahore – Pakistan [/expand]
Abstract
Laser ablation is one of the competent machining processes to fabricate micro-features in variety of engineering materials. This study has been progressed to evaluate the process capability of generating micro channels of various sizes (50 x 50 µm, 100 x 100 µm, 200 x 100 µm and 1000 x 500 µm) in titanium alloy (Ti6Al4V) using Nd:YAG laser. Channel’s top width, bottom width, depth and taperness are examined as the four process responses against three laser based parameters to the naming of laser intensity, repetition rate and scan speed. All the geometrical dimensions are measured through photographic snapshots of SEM of each fabricated channel. The results reveal that the selection of channel size is critical to achieve the desired machining geometries. Wider sized channels (such as 200 x 100 µm, 500 x 1000µm) are experienced as more flexible to be generated than narrower sized channels (50 x 50 µm and 100 x 100 µm). The precise parametric combination is the key to realize more tight dimensional enormities with respect to the targeted machining elements. The most appropriate parametric combinations that can generate the respectable results are explored and applied for machining of different channel sizes.
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