Figure 2.

X-ray images of liquid Sn-30wt%Cu alloy, without the application of ultrasound, (a) a typical flat-field image, and the black regions at the corners of the images are from the lens mount of the camera. (b) in the chaotic cavitation region with the sonotrode (marked with the white dotted line) in the view field; (c) in the quasi static cavitation region, i.e., 1.5 mm below the sonotrode. g₀, g₁ and g₂ mark the locations (including the grey level) where the thicknesses of the liquid metal are known as listed in Table 1.