Ultrasonic Rheo-Diecasting of A383 Aluminum Alloy

Abstract:

In this study, un-refined A383 aluminum alloy was cast at different temperatures using ultrasonic melt treatment. The liquid alloy was treated by ultrasonic vibrations in the crucible and/or in the shot sleeve of a pressure diecasting machine. The treatment temperature extended to the semisolid temperature range. The UST melt could be injected into the die cavity while being in the semisolid state which is known as rheodiecasting. The results showed that ultrasonic treatment resulted in finer microstructure, globular Fe-intermetallic particles and partially modified eutectic Si. For samples solidified in shot sleeve: Fe-intermetallics become compacted with UST at all positions of ingot. Si particles are compacted in less acicular form near to horn and acicular at other positions. For the rheo-diecasting experiments, with UST treatment in the crucible and die casting, at 600-588 C and 588-578C, Fe-intermetallics were observed in compact form, and Si particles were highly modified.

• Periodical: Solid State Phenomena (Volume 256)
• Pages: 282-287
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.256.282
• Online since: September 2016
• Authors: Waleed Khalifa, Yoshiki Tsunekawa, Shimaa El-Hadad*
• Keywords: A383, Aluminium, Microstructure, Rheodiecasting, Ultrasonic

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