RESEARCH ON MORPHOLOGY EVOLUTION OF PRIMARY PHASE IN SEMISOLID A356 ALLOY UNDER CHAOTIC ADVECTION

doi:10.11900/0412.1961.2015.00228

Acta Metall Sin

2016, Vol. 52

Issue (2): 177-183 DOI: 10.11900/0412.1961.2015.00228

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RESEARCH ON MORPHOLOGY EVOLUTION OF PRIMARY PHASE IN SEMISOLID A356 ALLOY UNDER CHAOTIC ADVECTION

Zheng LIU¹(

),Jiayi ZHANG²,Haolin LUO²,Keyue DENG¹

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,Jiayi ZHANG,Haolin LUO,Keyue DENG. RESEARCH ON MORPHOLOGY EVOLUTION OF PRIMARY PHASE IN SEMISOLID A356 ALLOY UNDER CHAOTIC ADVECTION. Acta Metall Sin, 2016, 52(2): 177-183.

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Abstract

Chaotic advection could be strengthened mix, mass transfer and heat transfer in the viscous fluid, the melt flow forming was affected by electromagnetic field in the metal solidification process, so were the macro and microstructure of materials. So it was necessary to study chaotic characteristics of semisolid Al alloy in the electromagnetic field. The characterization of chaotic convention and morphology of primary phase were mainly researched in semisolid A356 alloy under the electromagnetic field. The trajectories of the particle in semisolid A356 alloy melt was simulated by the computational fluid dynamics software Fluent, the Kolmogorov entropy and fractal dimension of the flow trajectories of semisolid A356 alloy melt were judged and analyzed. The results showed that chaotic advection may happen in semisolid alloy melt under electromagnetic field. Combined with experiment, the results of process parameters and different current frequencies were compared. The results showed that the primary phase with 59.86 μm in average equal-area circle diameter, 0.71 in average shape factor, 6829.5 nat/s of Kolmogorov entropy and 2.2439 of fractal dimension can be obtained in semisolid A356 alloy with pouring 650 ℃, stirring for 15 s at 30 Hz, and holding at 590 ℃ for 10 min. Meanwhile, the morphology of primary phase can be observed with the best parameters.

Key words: semisolid A356 alloy chaotic advection Kolmogorov entropy fractal dimension electromagnetic stirring

Received: 20 April 2015

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 (NoGJJ14407)

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	Zheng LIU
	Jiayi ZHANG
	Haolin LUO
	Keyue DENG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00228 OR https://www.ams.org.cn/EN/Y2016/V52/I2/177

Fig.1 Trajectories of particles without electromagnetic stirring (a) and electromagnetic stirring at frequencies of 5 Hz (b), 10 Hz (c), 20 Hz (d), 30 Hz (e) and 40 Hz (f)

Fig.2 Kolmogorov entropy (S_k) (a) and fractal dimension (b) of coagulation system of trend chart under different frequencies for 15 s

Fig.3 Morphologies of primary phase in semisolid A356 alloy without electromagnetic stirring (a) and with electromagnetic stirring at 10 Hz (b), 20 Hz (c), 30 Hz (d) and 40 Hz (e)

Fig.4 Average equal-area circle diameter (D) and shape factor (F) of primary phase under different frequencies of electromagnetic stirring

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