Development of Al/Mg Bimetal Processed by Ultrasonic Vibration-Assisted Compound Casting: Effects of Ultrasonic Vibration Treatment Duration Time

In this work, ultrasonic vibration treatment (UVT) was introduced to improve the interfacial microstructure and bonding strength of A356/AZ91D bimetal processed via lost foam compound casting (LFCC). The mechanical properties Al/Mg LFCC with different UVT durations were investigated. Results revealed did not change composition phases at interface. bimetallic interface consisted an intermetallic area (β-Al3Mg2 + γ-Al12Mg17 Mg2Si) eutectic (δ-Mg Mg2Si). When duration increased, gathered Mg2Si particles refined sizes no more than 5 μm became homogeneously dispersed in diffused area, which could be attributed removal oxide film acoustic cavitation streaming flow effects induced by UVT. microhardness obviously changed increase duration. shear increased reached maximum a s, value 56.7 MPa, 70.3%, compared without This interface, improved metallurgical Additionally, played important role suppressing propagation cracks enhancing bimetal.