Effect of a Novel Low-Voltage Alternating Current Pulse on Solidification Structure of Al-7Si-0.52Mg Alloy

Li Min Zhang; Rong Zhang; Wen Jing Chen; Yue Wei Wu; Ning Li

doi:10.4028/www.scientific.net/AMR.482-484.1431

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 482-484Effect of a Novel Low-Voltage Alternating Current...

Effect of a Novel Low-Voltage Alternating Current Pulse on Solidification Structure of Al-7Si-0.52Mg Alloy

Abstract:

The solidification structure applying a novel low-voltage alternating current pulse (ACP) during solidification of Al-7Si-0.52Mg alloy has been investigated. The results indicated that the grain density increased with increasing current density. A remarkable refinement of grain occurred, and the microstructure of primary α-Al phase transforms from developed dendrites to fine rosette equiaxed grain when the current density was more than 230 Acm^-2. The grain refinement was mainly achieved during the nucleation stage rather than the stage of liquid inoculation and dendrite growth. It was concluded that the grain refinement under ACP during nucleation stage was due to the enhancement of nucleation rate induced by an additional electric potential energy.

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Periodical:

Advanced Materials Research (Volumes 482-484)

Pages:

1431-1435

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.482-484.1431

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Online since:

February 2012

Authors:

Li Min Zhang, Rong Zhang, Wen Jing Chen, Yue Wei Wu, Ning Li

Keywords:

Electric Potential Energy, Grain Refinement, Low-Voltage Alternating Current Pulse, Nucleation Stage

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