Effect of Electromagnetic Vibration on Microstructures of Semi-Continuous Casting AZ80 Magnesium Alloy Billet

Microstructures and macrosegregation of AZ80 magnesium alloy billets cast with and without the electromagnetic vibration were investigated. Compared with the conventional DC casting, microstructures of the billet have been greatly refined and the macrosegregation had been effectively reduced in electromagnetic vibration casting conditions. Increasing the electromagnetic vibration intensity, including both the stationary magnetic field and alternating magnetic field, leads to finer grains and more uniform distribution of solute elements in the billet.

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Study on Electromagnetic Vibration Casting (EVC) of Magnesium Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.546-549.207 ◽

2007 ◽

Vol 546-549 ◽

pp. 207-210

Author(s):

Qi Chi Le ◽

Shi Jie Guo ◽

Zi Qiang Zhang ◽

Jian Zhong Cui ◽

Z.Z. Zhao

Keyword(s):

Magnesium Alloy ◽

Magnesium Alloys ◽

Vibration Frequency ◽

Large Diameter ◽

High Quality ◽

Light Alloys ◽

Electromagnetic Vibration ◽

Dc Casting ◽

Vibration Casting ◽

Solidification Microstructures

Electromagnetic Vibration Casting (EVC) is a new effective technical processing for optimizing solidification microstructures of light alloys. In this paper, this technology was induced into magnesium alloy DC casting for providing high-quality large diameter billets. The effects of vibration frequency and current intensities on the microstructures of large diameter billets were investigated. The results indicate that electromagnetic vibration would refine grains and the reduce macrosegregation effectively.

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Effect of Physical Fields on Solidification Structures of DC Casting AZ80 Magnesium Alloy Billets

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.105-107.1616 ◽

2011 ◽

Vol 105-107 ◽

pp. 1616-1619

Author(s):

Zhi Qiang Zhang ◽

Qi Chi Le ◽

Jian Zhong Cui

Keyword(s):

Magnesium Alloy ◽

Continuous Casting ◽

Low Frequency ◽

Direct Chill ◽

Ultrasonic Fields ◽

Electromagnetic Casting ◽

Az80 Magnesium Alloy ◽

Continuously Cast ◽

Dc Casting ◽

Physical Fields

AZ80 magnesium alloy was semi-continuously cast under different physical fields which were conventional direct chill (DC) casting, low frequency electromagnetic casting (LFEC), ultrasonic casting (USC) and electromagnetic-ultrasonic combined casting (ECUC), respectively. The effect of different physical fields on solidification structures of AZ80 alloys was investigated. The results show that compared with the conventional DC casting, structures of AZ80 alloys billets cast with LFEC and USC have been greatly refined. The effective refinement takes place in the edge of billets when LFEC is applied. However, the effective refinement takes place in the center of billets when USC is applied. When combination of low frequency electromagnetic and ultrasonic fields is applied during semi-continuous casting AZ80 magnesium alloy billet, structures of AZ80 alloys are refined significantly in the whole billets everywhere and more uniform.

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Comparison on Effect of Alternating and Stationary Magnetic Field on the Conductivity of NaCl Solutions

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.391-392.1095 ◽

2011 ◽

Vol 391-392 ◽

pp. 1095-1099

Author(s):

Lei Chen ◽

Nan Li ◽

Feng Chai ◽

Shu Kang Cheng

Keyword(s):

Magnetic Field ◽

Magnetic Fields ◽

Magnetic Moment ◽

Experimental Results ◽

Alternating Magnetic Field ◽

Stationary Magnetic Field ◽

Conductivity Change

NaCl solutions of different concentrations were exposed to alternating and stationary magnetic fields. The conductivity change of the NaCl solutions was measured. The change of the conductivity of the NaCl solutions under different amplitudes magnetic fields was studied. The differences of effect between stationary and alternating magnetic field on the conductivity of the NaCl solutions was compared. The principle of the effects of magnetic fields on conductivity of NaCl solutions was discussed. The process of magnetic moment deflexion effected by the alternating magnetic field was analyzed, which explained the experimental results that the conductivity was increased more larger when then the NaCl solutions were exposing to alternating magnetic field than stationary magnetic field.

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