There are quite a few studies that acclaim the potential of ultrasonic technology for improving the quality of light metal products. Due to the limitations of conventional low frequency (pulsed) ultrasound, industrial upscaling was never realised, until today.
Read more here: http://www.aluminiumtoday.com/contentimages/features/casting_nico.pdf
Ultrasonic degassing and grain refinement applied to continuous casting and direct chill casting.
Ultrasonic uniform vibration of the melt caused by a special grade Sialon non-wetting sonotrode
A novel 20 kHz ultrasound generator creating uniformly distributed 3D acoustic energy for degassing, mixing, alloying and homogenization of (molten) aluminium.