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Laser-Machining of Microchannels in NiTi-Based Shape-Memory Alloys: Experimental Analysis and Process Optimization
Muneer Khan Mohammed1, Abdulrahman Al-Ahmari1,2
1Raytheon Chair for Systems Engineering (RCSE), Advanced Manufacturing Institute, King Saud University, Riyadh 11421, Saudi Arabia.
Materials (Basel, Switzerland)
|July 8, 2020
Summary
Laser-machining effectively processes difficult-to-cut Nickel-Titanium (NiTi) shape-memory alloys (SMA). Optimal parameters minimize microchannel defects like taper angle and spatter, crucial for microsystem applications.
Area of Science:
- Materials Science
- Manufacturing Engineering
- Surface Engineering
Background:
- Nickel-Titanium (NiTi) shape-memory alloys (SMA) offer unique properties for automotive, biomedical, and microsystem applications.
- Conventional machining of NiTi SMA is challenging due to work hardening and residual stresses.
Purpose of the Study:
- Investigate the impact of laser-machining parameters on microchannel quality in NiTi SMA.
- Perform multi-objective optimization to identify optimal processing settings for desired performance.
Main Methods:
- Systematic study of laser-machining process parameters.
- Multi-objective optimization techniques applied to minimize taper angle and spatter thickness.
Main Results:
- Microchannel quality is highly sensitive to laser-machining input parameters.
- Layer thickness significantly influences microchannel taper angle.
- Scan speed, layer thickness, and scan strategy affect spatter thickness and top-width error.
Conclusions:
- An optimal laser-machining strategy (high frequency, moderate speed, low layer thickness, and track displacement) was identified.
- This optimized approach effectively minimizes taper angle and spatter thickness in NiTi SMA microchannels.
