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Microstructural Investigation of Semisolid Aluminum A356 Alloy Prepared by the Combination of Electromagnetic Stirring and Gas Induction

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Abstract:

A three phase electromagnetic stirrer was used to agitate aluminum A356 slurry and a dry and oxygen free argon gas was introduced in to the slurry by a porous graphite core at a same time. The prepared semi-solid slurry was then transferred into a metallic mold and was compacted by a drop weight. Results demonstrated a favorable increase in shape factor, decrease in aspect ratio and average diameter size at different intensities of stirring. The intensity of stirring was changed by altering the current passed through the magnetic coil and also bubbling intensity via the porous graphite diffuser. Different time intervals for electromagnetic stirring and gas induction were applied. Agitating the slurry for 90 Sec. separately by electromagnetic stirrer and GISS method, gave better results in terms of shape factor, decrease in average diameter of the globules and aspect ratio.

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Periodical:

Solid State Phenomena (Volume 285)

Pages:

290-295

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.285.290

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Online since:

January 2019

Authors:

Nora Nafari, Farnoush Yekani, Hossein Aashuri*

Keywords:

A356 Alloy, Electromagnetic Stirring, Gas Induced Semi-Solid (GISS), Globular Microstructure, Semi-Solid Process

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© 2019 Trans Tech Publications Ltd. All Rights Reserved

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