Hostname: page-component-78c5997874-t5tsf Total loading time: 0 Render date: 2024-11-19T08:52:15.024Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Zhong, G., Shu-Sen, W.U., Ping, A.N., Mao, Y.W., and Shi-Zhao, L.I.: Microstructure and properties of high silicon aluminum alloy with 2% Fe prepared by rheo-casting. Trans. Nonferrous Met. Soc. China 20, 1603–1607 (2010).10.1016/S1003-6326(09)60346-0CrossRefGoogle Scholar
Zhang, K., Yu, H., Liu, J.Y., Li, Y.X., Liu, J., and Zhang, J.L.: Microstructure and property of a functionally graded aluminum silicon alloy fabricated by semi-solid backward extrusion process. Mater. Sci. Eng., A 624, 229–238 (2015).10.1016/j.msea.2014.11.044CrossRefGoogle Scholar
Liu, N.C., Kang, G.S., and Liu, Z.X.: Effect of compound modification on microstructure and properties of high silicon aluminum alloy. Adv. Mater. Res. 476–478, 114–117 (2012).10.4028/www.scientific.net/AMR.476-478.114CrossRefGoogle Scholar
Li, M., Li, Y-d., Zheng, H-q., Huang, X-f., Chen, T-j., and Ma, Y.: Solidification behavior of 6061 wrought aluminum alloy during rheo-diecasting process with self-inoculation method. Chin. J. of Nonferrous Met. 28, 879–889 (2016).10.1016/S1003-6326(18)64721-1CrossRefGoogle Scholar
Mullis, A.M.: Growth induced dendritic bending and rosette formation during solidification in a shearing flow. Acta Mater. 47, 1783–1789 (1999).10.1016/S1359-6454(99)00052-XCrossRefGoogle Scholar
Zhang, Y., Wu, G.H., Liu, W.C., Zhang, L., Pang, S., and Ding, W.J.: Preparation and rheo-squeeze casting of semi-solid AZ91–2 wt% Ca magnesium alloy by gas bubbling process. J. Mater. Res. 30, 825–832 (2015).10.1557/jmr.2015.36CrossRefGoogle Scholar
Simlandi, S. and Barman, N.: Study on rheological behavior of semisolid A356 alloy during solidification. Trans. Indian Inst. Met. 65, 809–814 (2012).10.1007/s12666-012-0204-zCrossRefGoogle Scholar
Luo, S.J., Cheng, Y.S., and Shan, W.: Rheology of Semi-solid Metal (National Defense Industry Press, Beijing, China, 2011).Google Scholar
Zhou, Z. and Tao, J.M.: Comparison analysis of melt temperature treatment of three typical Al–Si alloy. Chin. J. Nonferrous Met. 14, 607–613 (2004).Google Scholar
Zhou, Z.H., Mao, W.M., Liu, Z., Xu, J., and Shi, L.K.: Rheological behavior of semi-solid AlSi6Mg2 aluminum alloy at steady state. Acta Metall. Sin. 41, 759–762 (2005).Google Scholar
Zhen, Z.S., Mao, W.M., Yan, S.J., Cui, C.L., Zhao, A.M., and Zhong, X.Y.: Microstructure and rheological behavior of semi-solid state AZ91D alloy in continuously cooling process. Acta Metall. Sin. 39, 73–76 (2003).Google Scholar
Wu, S.S. and Liu, Y.Q.: Forming Principles of Materials (Mechanical Industry Press, Beijing, China, 2008).Google Scholar
Chen, H.I., Chen, J.C., and Liao, J.J.: The influence of shearing conditions on the rheology of semi-solid magnesium alloy. Mater. Sci. Eng., A 487, 114–119 (2008).10.1016/j.msea.2007.09.072CrossRefGoogle Scholar
Joly, P.A. and Mehrabian, R.: The rheology of a partially solid alloy. J. Mater. Sci. 11, 1393–1418 (1976).10.1007/BF00540873CrossRefGoogle Scholar
Chen, Z.B., Li, L., Zhou, R.F., Jiang, Y.H., Zhou, R., and He, Z.J.: Influence of rotating-rod induced nucleation on solidification microstructure of Al–25% Si alloy. T. Mater. Heat Treat. 35, 39–44 (2014).Google Scholar
Tzimas, E. and Zavaliangos, A.: Mechanical behavior of alloys with equiaxed microstructure in the semisolid state at high solid content. Acta Mater. 47, 517–528 (1999).10.1016/S1359-6454(98)00356-5CrossRefGoogle Scholar
Barman, N.: Rheology of A356 alloy during solidification under stirring. Trans. Indian Inst. Met. 67, 101–104 (2014).10.1007/s12666-013-0325-zCrossRefGoogle Scholar