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Rheological behavior of semisolid hypereutectic Al–Si alloys

Published online by Cambridge University Press:  12 March 2019

Qiuping Wang Open the ORCID record for Qiuping Wang [Opens in a new window] ,
Lu Li ,
Rongfeng Zhou ,
Yongkun Li ,
Fan Xiao  and
Yehua Jiang
Qiuping Wang
Affiliation:
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Lu Li*
Affiliation:
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; and Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, China
Rongfeng Zhou
Affiliation:
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; and Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, China
Yongkun Li*
Affiliation:
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Fan Xiao
Affiliation:
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Yehua Jiang
Affiliation:
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
*
a)Address all correspondence to this author. e-mail: lilukust@126.com
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Abstract

Refinement and homogenization of primary Si particles in hypereutectic Al–Si alloys is an effective route to enhance the tensile strength and wear resistance and satisfy the industrial requirements for a wide range of applications. Herein, two kinds of semisolid hypereutectic Al–Si alloys are synthesized by using a rotating-rod-induced nucleation technology. The influence of different cooling conditions and shear rates on the apparent viscosity of molten melt of slurry are examined by self-made high-precision and high-temperature apparent viscosity test equipment. The correlation between the shear rate and the uniformity of hard phases has been investigated from the obtained results, fitting curves, and optical microscope. With the increase in the shear rate, the particles tend to become rounder and the apparent viscosity becomes lower. The enhanced shape factor resulted in more rounded grains, which further reduced the apparent viscosity. During the same cooling time, the higher cooling rate resulted in higher solid fraction, generating higher apparent viscosity. The present study provides unique insight into the filling behavior of semisolid hypereutectic Al–Si alloys and serves as a baseline for future work.

Keywords

hypereutectic Al–Si alloyssecondary phasessemisolid slurryapparent viscosityshear rate

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Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 12 , 28 June 2019 , pp. 2105 - 2113
Copyright
Copyright © Materials Research Society 2019 

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