Erosion resistance and performance characteristics of niobium ultrasonic sonotrodes in molten aluminum

► Nb and Nb-Mo alloy tips are used to introduce ultrasonic vibrations in molten Al. ► Nb-Mo tip has a higher resistance to cavitation erosion and a longer life span. ► Nb-Mo tip shows a superior ability to produce cavitation in molten Al. ► Nb-Mo alloy is a more promising material to make the tips for ultrasonic casting.