Photoacoustic detection has shown excellent performance in measuring the thickness and detecting defects in metal nanofilms. However, during ultrafast photoacoustic detection, signal quality depends on both laser parameters and the physical properties of nanofilms. Therefore, it is important to study how physical processes evolve under different laser parameters to improve signal quality in various film materials. In this study, we have developed a comprehensive physical model that combines the Two-Temperature Model with the acoustic wave generation and detection model. Our numerical results, which are based on a 500-nm AlCu film composed of 95% aluminum and 5% copper, closely align with experimental results, demonstrating the validity of this model. This research offers valuable insights for improving photoacoustic signals in practical applications.
In this work, the WC-NiCrBSi and in-situ synthesised WC (IWC)-NiCrBSi coatings were successfully fabricated on SS 316 L using vacuum cladding process to investigate the WC-reinforced NiCrBSi alloy by the two methods. XRD, SEM and EDS were performed to characterise the phase constituents, microstructure and chemical composition, respectively. Subsequently, electrochemical corrosion and cavitation tests of the coatings were carried out in 3.5 wt-% NaCl solution. The results showed that the WC-NiCrBSi cladding coating was mainly composed of γ-Ni, FeNi 3 , WC, Cr 23 C 6 and CrB phases, while the IWC-NiCrBSi cladding coating was composed of γ-Ni, WC, FeNi 3 , Cr 23 C 6 , Cr 7 C 3 , CrB phases. The corrosion current density of the WC-NiCrBSi and IWC-NiCrBSi coatings were 5.01 × 10 −7 and 3.57 × 10 −7 A/cm 2 , respectively. The combined analysis of cumulative weight loss curve and cavitation morphology revealed a better cavitation resistance by the IWC-NiCrBSi coating than the WC-NiCrBSi coating in 3.5 wt-% NaCl solution.
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