Abstract
The effect of ultrasonic waves during solidification of melt on the structure of Al-Si alloys was studied with a 28 kC magnetostrictive vibrator. The results obtained were as follows: (1) In the hypereutectic alloys ultrasonic waves seem to favor the separation of Si primary crystals, and in the hypereutectic alloys they effectively serve in forming primary crystals finer than without the treatment. (2) The crystal refinement is independent on the rate of solidification. (3) The crystal refinement is not proportional to the vibrational intensity. Below a certain intensity value, no additional crystal refinement is observed. (4) The mechanism of the refinement seems to be due not only to the breaking of crystals by frictional force of the vibrated melt, but also to a direct effect of ultrasonic waves on their nucleation.
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call