Comparison of Si Refinement Efficiency of Electromagnetic Stirring and Ultrasonic Treatment for a Hypereutectic Al Si Alloy
The effects of electromagnetic stirring, ultrasonic treatment (UT) and their combination on the Si particles refinement in a hypereutectic Al Si alloy (A390) were examined. All three physical methods yielded a considerable change in the shape and size of the particles, with UT producing the finest size. The creation of holes inside the Si particles via the explosion of cavitation bubbles was determined to occur before fragmentation of primary Si. In addition, transmission electron microscopy analysis revealed twin formation on primary Si particles by application of an external field in the liquid. UT of the melt was sufficient to produce fine primary Si particles with average size of ~12 um. The primary Si particles refinement and eutectic Si modification improved the mechanical properties.
Journal of Materials Engineering and Performance