研究目的
To fabricate precise and sound quality microchannel on NiTi shape memory alloy (SMA) using Nd3+: YAG laser in open-air and underwater processing conditions, and to study the effect of processing conditions and scanning speed on the kerf dimension, surface morphology, and phase transformation temperatures.
研究成果
The study successfully demonstrated the fabrication of microchannels on NiTi SMA using Nd3+: YAG laser in both open-air and underwater conditions. Underwater processing resulted in cleaner surfaces with no debris or recast layer formation, while open-air processing led to surface irregularities. The phase transformation temperatures were slightly shifted in processed samples compared to unmachined material, indicating minimal impact on the smart material characteristics. The optimal scanning speed for high-quality microchannel fabrication was found to be 10 μm/s with a laser wavelength of 532 nm in an underwater environment.
研究不足
The study was limited to the use of a nanosecond pulsed Nd3+: YAG laser and did not explore other laser types or pulse durations. The effects of other environmental conditions or processing parameters were not investigated.
1：Experimental Design and Method Selection:
The study employed a Q-switched Nd3+: YAG laser with three different wavelengths (1064 nm, 532 nm, and 355 nm) for microchannel fabrication on NiTi SMA sheets under open-air and underwater conditions. The laser pulse duration was 9 ns with a repetition rate of 10 Hz. The output energy was kept at 100 mJ, and scanning speeds varied from 4–14 μm/s.
2：Sample Selection and Data Sources:
NiTi sheets (Ni at 55% and Ti at 45%) with dimensions of 10 mm × 10 mm × 350 μm were used. The samples were mounted in an acrylic container for underwater processing.
3：List of Experimental Equipment and Materials:
Q-switched Nd3+: YAG laser (Quanta-Ray INDI), computer-controlled X-Y micro motion controller stage, acrylic container, FE-SEM, XRD, DSC, and UV-Vis spectroscopy.
4：Experimental Procedures and Operational Workflow:
The NiTi sheets were processed at different laser wavelengths and scanning speeds in both open-air and underwater environments. The surface morphology, structural changes, and phase transformation temperatures were analyzed post-processing.
5：Data Analysis Methods:
FE-SEM for surface morphology, XRD for structural analysis, DSC for phase transformation temperatures, and UV-Vis spectroscopy for absorbance analysis.
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