Effects of Crucible Size and Electromagnetic Frequency on Flow During Fabrication of Semisolid A356 Al Alloy Slurry

doi:10.11900/0412.1961.2017.00251

Acta Metall Sin

2018, Vol. 54

Issue (3): 435-442 DOI: 10.11900/0412.1961.2017.00251

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Effects of Crucible Size and Electromagnetic Frequency on Flow During Fabrication of Semisolid A356 Al Alloy Slurry

Zheng LIU¹(

), Zhiping CHEN¹, Tao CHEN²

1 School of Mechanical and Electronic Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2 School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

Cite this article:

Zheng LIU, Zhiping CHEN, Tao CHEN. Effects of Crucible Size and Electromagnetic Frequency on Flow During Fabrication of Semisolid A356 Al Alloy Slurry. Acta Metall Sin, 2018, 54(3): 435-442.

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Abstract

A356 aluminum alloy has been widely used in semisolid processing because of its wide range of liquidus and solidus temperatures. The flow of the melt during solidification has a certain influence on the composition, solute distribution, phase morphology and crystal defects of the alloy in the solidification structure. The flow of melt is an important factor that influences the overall performance of the solidification process. The researchers use various external fields to act on the melt to induce the melt flow. Electromagnetic stirring has the characteristics of no contact, no pollution, light oxidation, less gas content and easy to control stirring parameters. It is the most popular method to fabricate semisolid alloy slurry. The electromagnetic force of the electromagnetic field can be used to study the flow phenomena of the melt. Numerical simulation combined with experimental research can get better results. The effects of crucible size and electromagnetic frequency on flow during fabrication of semisolid A356 aluminum alloy slurry under electromagnetic stirring through numerical simulation as well as the influence of crucible size on the primary phase of semisolid A356 aluminum alloy slurry induced by electromagnetic field were investigated. The results show that with the increasing of the major and minor axial ratio of crucible (R), the maximum electromagnetic force and maximum flow rate of the semisolid A356 aluminum alloy at the minor axis firstly increase and then decrease, and the maximum electromagnetic force and maximum flow rate of the semisolid A356 aluminum alloy at the major axis increase first, then decrease and then increase. The higher the electromagnetic frequency, the electromagnetic force difference and the flow rate difference of the semisolid A356 aluminum alloy at the minor axis and the major axis are apparent, so that occurs the phenomenon of "acceleration-deceleration-acceleration" in the melt flow. When the electromagnetic frequency and R are 30 Hz and 1.1 respectively, the maximum flow rate at the major axis and the minor axis of the crucible are 153.6 and 143.2 mm/s respectively, and the flow rate difference is the smallest, better semisolid A356 aluminum alloy slurry can be fabricated at this condition.

Key words: semisolid aluminum alloy crucible size electromagnetic frequency flow rate numerical simulation

Received: 26 June 2017

Fund: Supported by National Natural Science Foundation of China (Nos.51144009 and 51361012), Natural Science Foundation of Jiangxi Province (No.20142bab206012) and Science and Technology Program of the Education Department of Jiangxi Province (No.GJJ14407)

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00251 OR https://www.ams.org.cn/EN/Y2018/V54/I3/435

Fig.1 Models (a~d) and mesh partitions (e~h) with major and minor axial ratio of crucible R=1.0 (a, e), R=1.1 (b, f), R=1.2 (c, g) and R=1.3 (d, h)

Fig.2 Calculation flow diagram

Fig.3 Maximum electromagnetic force under different R (a) and electromagnetic frequencies (b) (X and Y represent minor and major axes, respectively)

Table 1 Electromagnetic force differences at major and minor axial under different R and electromagnetic frequencies Nm^-3)

Fig.4 Maximum flow rates under different R (a) and electromagnetic frequencies (b)

Table 2 Flow rate differences at major and minor axial under different R and electromagnetic frequencies (mms^-1)

Fig.5 OM images show the primary phase morphologies of semisolid A356 alloy with R=1.0 (a), R=1.1 (b), R=1.2 (c) and R=1.3 (d)

Fig.6 Average equal-area circle diameter D and average shape factor F of the primary phase of the semisolid A356 alloy under different R

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