Abstract
The containerless melting and solidification of Ag-Cu eutectic alloy were accomplished by acoustic levitation together with laser heating.The temperature field of levitated alloy droplet was investigated through CMOS image processing and numerical calculation.Due to the effect of acoustic radiation pressure,the alloy droplets deform from spherical to oblate or disklike shapes.Their surface temperature rises along the meridian line from the equator to the poles during cooling process.Surface ripples are observed on those samples with greater deformation(a/b2.1).And it is found that eutectic grains nucleate at the center of these ripples,and grow in the direction parallel to the propagation of ripples.The surface nucleation and the radial advance of solid-liquid interface are revealed to be the two key factors for the formation of surface ripples.The enhancement of sound pressure can induce the surface nucleation of levitated Ag-Cu eutectic alloy.
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