Influence of Ultrasonic Treatment on the Microstructure of Hypereutectic Al-17 Wt%Si Alloys

Young Hee Cho; Jung Moo Lee; Woon Ha Yoon; Jae Gil Jung

doi:10.4028/www.scientific.net/MSF.794-796.89

Paper Titles

Atomic-Resolution Elemental Mapping of Precipitates in a 7449 Aluminium Alloy
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Effect of Casting Temperature on Grain Size of Al-Si Alloys Refined by a Novel Grain Refiner
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Segregation during Metal Sampling
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Influence of Ultrasonic Treatment on the Microstructure of Hypereutectic Al-17 Wt%Si Alloys
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Tensile Properties and Hot-Tearing Tendencies of 3xxx Alloys
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Ultrasonic Melt Processing: Opportunities and Misconceptions
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Effect of Potential on Hydrogen Evolution during Pitting of Aluminum
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Study on Absorption Rate of Phosphorus for Hypereutectic Al-Si Alloy Modified with Cu-P
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HomeMaterials Science ForumMaterials Science Forum Vols. 794-796Influence of Ultrasonic Treatment on the...

Influence of Ultrasonic Treatment on the Microstructure of Hypereutectic Al-17 Wt%Si Alloys

Abstract:

The effect of ultrasonic melt treatment (UST) on the microstructure of hypereutectic Al-17 wt.% Si alloys was investigated. UST applied to a melt at a temperature range of 750 - 800 °C refines the primary Si dramatically but has little influence on the grain size of primary Al. The solidification behaviour was characterised by thermal analysis and a mechanism responsible for the primary Si refinement was suggested. Whilst UST has no effect on the grain refinement, a significant increase in the matrix hardness as well as the tensile strength in the as cast condition is possibly associated with solid solution hardening. Detailed microstructure analysis was carried out and characteristics of the intermetallic formation in the Al-17 wt.% Si alloys were further discussed in the view point of Cu solubility in the Al matrix, which is considered to increase with UST.

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Periodical:

Materials Science Forum (Volumes 794-796)

Pages:

89-94

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.794-796.89

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Online since:

June 2014

Authors:

Young Hee Cho*, Jung Moo Lee, Woon Ha Yoon, Jae Gil Jung

Keywords:

Hypereutectic Al-Si Alloy, Microstructure, Refinement, Ultrasonic Melt Treatment

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