Globular Crystals in the Center of Roll Cast Aluminum Alloy Strips

Toshio Haga; Maho Tsuchida; Hirotaka Sakata; Hisaki Watari; Shinichi Nishida

doi:10.4028/www.scientific.net/MSF.1007.34

Paper Titles

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Effect of Si and Mn Addition on Fluidity, Mechanical Property and Casting Crack in Die Casting
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Changing from a Vertical Burr to a Horizontal Burr in the Vertical-Type High-Speed Twin-Roll Caster
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Globular Crystals in the Center of Roll Cast Aluminum Alloy Strips
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Effect of Alloying Elements on Mechanical Properties of High-Strength Low-Alloy Steel
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Effect of Synthesis Conditions on the Preparation of Ag/ZnTiO₃ via Sol-Gel Method and its Antibacterial Properties
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Mechanochemical Synthesis of Zinc Oxide Nanoparticles and their Antibacterial Activity against Escherichia Coli
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HomeMaterials Science ForumMaterials Science Forum Vol. 1007Globular Crystals in the Center of Roll Cast...

Globular Crystals in the Center of Roll Cast Aluminum Alloy Strips

Abstract:

This study investigated the crystallization position and formation mechanism of globular crystals at the center area in the thickness direction of aluminum alloy strips cast by a high-speed twin roll caster. Twin roll casters for single strips and clad strips were used, as well as twin roll casters equipped with a cooling slope. The globular crystals were formed from dividing arms of dendrites of the solidified layer facing the center area at the roll gap. The arms of isolated dendrite also divided. No globular crystals were formed at the interfaces of clad strips with different solidification temperatures because of the temperature gradient at the interface which inhibited division of the dendrite arms. It was demonstrated that globular crystals at the center area of the thickness direction were formed by dendrite-arm-dividing at the roll gap by the strip casting clad strip. Experiments by semisolid-strip casting with the cooling slope showed that globular crystals in the molten metal existed in the solidification layers.

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Periodical:

Materials Science Forum (Volume 1007)

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34-40

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https://doi.org/10.4028/www.scientific.net/MSF.1007.34

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Online since:

August 2020

Authors:

Toshio Haga*, Maho Tsuchida, Hirotaka Sakata, Hisaki Watari, Shinichi Nishida

Keywords:

Globular Crystal, Semisolid, Temperature Gradient, Twin Roll Caster

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