Effect of ultrasonic vibration and solution heat treatment on microstructures and tensile properties of AZ91 alloy

- Ultrasonic vibration could refine the phase Mg17Al12 of AZ91 alloy.
- Solution heat treatment was effective in dissolving the phase Mg17Al12.
- The tensile properties of AZ91 alloy with ultrasonic vibration were improved.
- The solution heat treatment could lead to the improvement of the tensile properties.