Microstructural Study of Primary Solid Particles in High Density Semi-Solid Al-Zn-Mg Alloy during Stirring

Joo Ho Lee; Young Ho Kim; Jung Il Lee; Il Ho Kim; Soon Chul Ur; Ho In Lee

doi:10.4028/www.scientific.net/SSP.116-117.308

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HomeSolid State PhenomenaSolid State Phenomena Vols. 116-117Microstructural Study of Primary Solid Particles...

Microstructural Study of Primary Solid Particles in High Density Semi-Solid Al-Zn-Mg Alloy during Stirring

Abstract:

The formation and character of grain boundaries in the primary solid particles observed in the metal slurries of stircast Al-4wt%Zn-1wt%Mg alloy were studied. In the semi-solid state of the solid fraction (fs) of more than 0.5, fracturing of solid particles appears to be dominated by shear force at high temperature, whilst in fs < 0.4 dendritic fragmentations are expected to occur by grain boundary melting. In case of shear rupture at fs > 0.5 coarsening of spherical solid particles takes place by Gibbs-Thompson effect of small particles remelting leading to solute redistribution.

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Periodical:

Solid State Phenomena (Volumes 116-117)

Pages:

308-311

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.116-117.308

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Online since:

October 2006

Authors:

Joo Ho Lee, Young Ho Kim, Jung Il Lee, Il Ho Kim, Soon Chul Ur, Ho In Lee

Keywords:

Al-Zn-Mg Alloy, Isothermal Stirring, Rheo-Casting, Shear Rupture

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