Abstract
Ultrasonic waves (frequency 20 kHz and maximum intensity 400 W) were applied in molten Mg alloys during solidification to a cylinder 30 mm in diameter and 100 mm long. Applying this treatment to Mg–4Zn–4Sn–1Si resulted in refinement of the dendritic structure and more uniform dispersion of the Mg2Sn and Mg2Si precipitates. The same treatment carried out on Mg–1·5Ca–3Zn alloy resulted in transition from dendritic solidification to equiaxed structure with a relatively uniform grain size. In addition, the formation of Mg2Ca was significantly suppressed.
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