Evolution of the Solidification Microstructure of Rheocast High Purity Aluminium

Sarah George; Robert Knutsen

doi:10.4028/www.scientific.net/SSP.192-193.109

Paper Titles

Continuous Production of Metal Matrix Composites from the Semisolid State
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Manufacturing of Composite and Hybrid Materials by Semi Solid Forming
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Mechanical Properties of Hypo/Hyper-Eutectic Al-Si Bi-Metal Composite Parts Prepared by Thixo-Forging
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Reduction of Hot Tearing of Cast Semi-Solid 206 Alloys
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Evolution of the Solidification Microstructure of Rheocast High Purity Aluminium
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Rheo-Processing of Near-Eutectic ADC12 Alloy
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Coarsening Mechanism of Isothermal Heat Treatment for ADC14 Semi-Solid Alloy
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Microstructure and Mechanical Properties of Hypereutectic Al-Si Alloy with 2% Fe Prepared by Semi-Solid Process
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Microstructural Evaluation of Semi-Solid and Thixoformed Parts of LM28 Aluminum Alloy
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HomeSolid State PhenomenaSolid State Phenomena Vols. 192-193Evolution of the Solidification Microstructure of...

Evolution of the Solidification Microstructure of Rheocast High Purity Aluminium

Abstract:

High purity aluminium has been successfully rheocast using the CSIR-RCS system combined with high pressure die casting. Analysis of the as-cast microstructure by SEM and EBSD revealed the presence of in-grain substructures. These morphological features show that the overall growth mode of the globular grains during rheocasting is planar, but the presence of these features indicates that the solidification mode is cellular at some stages during the slurry production process. Cellular solidification is associated with unstable growth at the solid-liquid interface and is initiated and exacerbated by solute gradients between the melt and the newly formed solid. This high purity alloy exhibits the same cellular growth, indicating that even minor solute variations have an effect on the stability of the solid-liquid interface and, hence, the mode of solidification during semi-solid rheocasting.

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Periodical:

Solid State Phenomena (Volumes 192-193)

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109-115

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https://doi.org/10.4028/www.scientific.net/SSP.192-193.109

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Online since:

October 2012

Authors:

Sarah George, Robert Knutsen

Keywords:

Cellular Growth, High Purity Aluminium, In-Grain Misorientation, Segregation, Semi-Solid Casting

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