研究目的
Investigating the ablation process of a BiSn eutectic alloy by a series of laser pulses, focusing on the morphology of the ablation craters and the chemical composition evolution.
研究成果
The ablation of BiSn samples by a pulsed UV excimer laser resulted in the evolution of crater morphology and stoichiometry of the laser plume with the number of laser pulses. The Knudsen and Clausius–Clapeyron equations explained the higher flux of Bi atoms compared to Sn atoms, leading to Bi depletion from the irradiated surface. Pronounced hydrodynamic effects and the formation of high rims were observed for the first time, attributed to the recoil effect of the ablation plume and the low melting point of the eutectic alloy.
研究不足
The study is limited to the ablation of BiSn eutectic alloy under specific laser conditions. The effects of different laser parameters or materials were not explored.
1：Experimental Design and Method Selection:
The experiment used an excimer laser with a wavelength of 351 nm and a pulse duration of 20 ns to ablate the surface of a eutectic BiSn target. The morphology of ablation craters was analyzed using a scanning electron microscope, an optical profilometer, and an energy dispersion spectroscope (EDS). LIBS measurements were taken for each crater with the last pulse in the series of pulses.
2：Sample Selection and Data Sources:
A BiSn eutectic alloy (58:42 wt. %) polished slab was used as the target. The surface was irradiated by 1, 10, 20, 40, and 70 pulses with a frequency of 1 Hz in five different locations.
3：List of Experimental Equipment and Materials:
Compex Pro 201 excimer laser, Andor Michelle 5000 spectrometer with an iStar 743 ICCD, Tescan Vega 3 SEM equipped with a backscattered electrons detector, and a Bruker energy-dispersive x-ray spectroscopy detector.
4：Experimental Procedures and Operational Workflow:
The laser beam was focused onto the sample surface, and LIBS spectra were collected by the ICCD. The setup was designed to collect an LIBS spectrum with higher spatial resolution from inhomogeneous substrates.
5：Data Analysis Methods:
The ratio of Bi/Sn intensities of the LIBS lines was analyzed for each of the craters. EDS analysis was used to determine the chemical composition evolution.
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