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Paper Titles
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Effect of Aluminium Powder on the Hot Mechanical Properties of Corundum-Silicon Nitride Composites
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Microstructural Refinement Process of Pure Magnesium by Pulse Magnetic Field Treatment
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Research on Microstructure and Mechanical Properties of High Boron Cast Steel
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Preparation of SiC-Low Chromium Cast Iron Composite Material by Cast-Infiltration
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Effect of Rare Earth on Microstructure and Property of Refining Impure-Copper
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Microstructural Refinement Process of Pure Magnesium by Pulse Magnetic Field Treatment

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Abstract:

The effects of pulsed magnetic field on the solidified structure of pure Mg were investigated. Fine uniform equiaxed grains are acquired in the whole ingot from the PMF treatment, in contrast with the coarse columnar grains observed in conventional casting, and the average grain size is refined to 260 m with a 5Hz PMF treatment. The mould size also affects the grain refinement and the most suitable inner diameter of the cylindrical mould is set at 50mm. Pulsed magnetic field increases melt convection during solidification, and the violent agitation causes warmer liquid to fracture the tip of columnar dendrites or to break off dendrite branches and promote the formation of an equiaxed structure, with the broken pieces transported into the bulk liquid acting as nuclei.

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Periodical:

Advanced Materials Research (Volumes 189-193)

Pages:

3964-3967

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.189-193.3964

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Online since:

February 2011

Authors:

Bin Wang, Ming Li Sun, Jing De Chen, Yong Bin Wei

Keywords:

Grain Refinement, Pulsed Magnetic Field, Pure Magnesium, Solidified Microstructure

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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