The Effect of the Microstructure of Semisolid Al Alloy on its Rheology

De Wen Cao; Jia Huan Wang; Yu Qing Sun; Ke Hua Chen; Cheng Ming Yu; Ping Ju Li

doi:10.4028/www.scientific.net/AMM.490-491.109

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 490-491The Effect of the Microstructure of Semisolid Al...

The Effect of the Microstructure of Semisolid Al Alloy on its Rheology

Abstract:

In the present work, the effect of the microstructure of AlSi6Mg2 alloy on its macro-rheological behavior of the steady AlSi6Mg2 alloy is investigated. Specifically, the effect of particle size, packing mode and degree of the agglomeration of particles are analyzed. It can be seen that the apparent viscosity decreases with increasing the particle size (d) if d is between a few μm and 200 μm, while the solid particle size does not affect viscosity except this region. This theoretical prediction is in qualitatively agreement with the experimental data. The trend of the variation of the average agglomerate size with the particle size is the same as the one of viscosity. The packing mode of solid particles in agglomerate is closely related to the solid volume fraction and the characteristics of the alloy system. Subsequently, the state of agglomeration of solid particles which determines the rheology of semisolid AlSi6Mg2 alloy, while the external flow conditions (such as shear rate) influence the viscosity by changing the state of agglomeration. Consequently, the particle size, the packing mode and the average agglomerate size have different effect on the rheological behavior of SSMS.

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Periodical:

Applied Mechanics and Materials (Volumes 490-491)

Pages:

109-112

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.490-491.109

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Online since:

January 2014

Authors:

De Wen Cao, Jia Huan Wang, Yu Qing Sun, Ke Hua Chen, Cheng Ming Yu, Ping Ju Li

Keywords:

Microstructure, Rheology, Semi-Solid Metal Slurries (SSMS)

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References

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