The effect of ultrasonic vibrations prior to high pressure die-casting of AA7075

摘要: Abstract The effects of introducing ultrasonic vibrations prior to high pressure die casting have been experimentally investigated. Results suggest reductions up 73% in grain size and 5% on porosity levels due cavitation, leading enhanced structural performance. typical values ultimate tensile stress yield increased respectively 590 MPa 502 MPa elongation improved 18%. Wetting the oxides by collapse cavitation bubbles along with degassing appears be responsible mechanisms for these property improvements. effect relaxation time after examined results indicate slight increase from 68 80 µm. Proving treatment above liquidus a stable phenomenon where its remaining active considerable time, making process feasible industrial scale applications.