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Effect of the frequency of electromagnetic vibrations on microstructural refinement of AZ91D magnesium alloy

Published online by Cambridge University Press:  01 October 2004

Yoshiki Mizutani ,
Jun Kawata ,
Kenji Miwa ,
Kazuo Yasue ,
Takuya Tamura  and
Yasuji Sakaguchi
Yoshiki Mizutani*
Affiliation:
Institute for Structural and Engineering Materials, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
Jun Kawata
Affiliation:
Department of Materials Science & Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
Kenji Miwa
Affiliation:
Institute for Structural and Engineering Materials, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
Kazuo Yasue
Affiliation:
Institute for Structural and Engineering Materials, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
Takuya Tamura
Affiliation:
Institute for Structural and Engineering Materials, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
Yasuji Sakaguchi
Affiliation:
Institute for Structural and Engineering Materials, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
*
a)Research Fellow of the Japan Society for the Promotion of Science. Address all correspondence to this author.e-mail: y-mizutani@aist.go.jp
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Abstract

The static magnetic field and the alternating electric field were simultaneously imposed on AZ91D magnesium alloy melt, and α-dendrite particles were refined by the electromagnetic vibrations. The effect of the frequency of electromagnetic vibrations on microstructural refinement was quantitatively investigated. In the frequency range from 60 to 1000 Hz, the vibration frequency near 200 Hz was the most effective for the refinement of α-dendrite particles, and α-dendrite particles were refined up to approximately 100 μm from 1800 μm at this frequency. However, the effect of refinement by the electromagnetic vibrations became weak at frequencies above 400 Hz. Although the degree of refinement of the primary particles differed with the frequency of the electromagnetic vibrations, the dendrite arm spacing was almost constant, 30–40 μm, in our experiment. Therefore, the refinement of primary α-dendrite particles is likely to be caused by collapse of dendrite arms due to the cavitation phenomenon and the stirring of the melt.

Keywords

CastingMetalCastin, metal
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 10 , October 2004 , pp. 2997 - 3003
Copyright
Copyright © Materials Research Society 2004

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