RESEARCH ON THE MORPHOLOGY AND FRACTALDIMENSION OF PRIMARY PHASE IN SEMISOLIDA356-La ALUMINUM ALLOY BY ELECTRO-MAGNETIC STIRRING

doi:10.11900/0412.1961.2015.00496

Acta Metall Sin

2016, Vol. 52

Issue (6): 698-706 DOI: 10.11900/0412.1961.2015.00496

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RESEARCH ON THE MORPHOLOGY AND FRACTALDIMENSION OF PRIMARY PHASE IN SEMISOLIDA356-La ALUMINUM ALLOY BY ELECTRO-MAGNETIC STIRRING

Zheng LIU¹(

),Lina XU²,Zhaofu YU²,Yangzheng CHEN²

1 School of Mechanical and Electrical 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

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Zheng LIU,Lina XU,Zhaofu YU,Yangzheng CHEN. RESEARCH ON THE MORPHOLOGY AND FRACTALDIMENSION OF PRIMARY PHASE IN SEMISOLIDA356-La ALUMINUM ALLOY BY ELECTRO-MAGNETIC STIRRING. Acta Metall Sin, 2016, 52(6): 698-706.

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Abstract

In order to obtain the fine, round and uniform distribution primary α phase in semisolid A356 alloy, the different amount of La was added into the alloy melt, and the melt was poured at 650 ℃ and slightly electromagnetically stirred under the condition of 30 Hz and 15 s, then, it was isothermally held at 590 ℃ for 10 min. The microstructure of the samples was observed by OM and SEM. The influences of La and electromagnetic stirring on morphology of primary α phase in semisolid A356 alloy were studied, and the symbolization of the characteristics of morphology of primary α phase by the fractal dimension was discussed in this work. The results showed that the morphology of primary α phase in semisolid A356 alloy was effectively improved by the suitable addition of La, no matter whether the semisolid slurry of A356-La alloy was prepared by electromagnetic stirring or not, the morphology of primary α phase showed better at first and then worse as the amounts of La increases, and the morphology and grain size of primary α phase reach the optimal state when the content of La was 0.4% (mass fraction). At the same time, the average equal-area circle diameter of the morphology of primary phase in semisolid A356-La alloy by electromagnetic stirring was finer than that without stirring, on the other hand, the shape factor was bigger than that without stirring. It implies that the primary α phase in semisolid A356-La alloy by electromagnetic stirring was smaller and more rounded than that without stirring, that is, the morphology of primary α phase in semisolid A356-La alloy by electromagnetic stirring was better than that without stirring. In addition, the real microstructure has fractal characteristics, and it was feasible to describe and analyze the change regularity and even the formation mechanism of the morphology of primary α phase in semisolid aluminum alloy by the principle of fractal geometry. The morphology of primary α phase in semisolid A356 alloy by the different process parameters had different fractal dimension. The fractal dimension of the semisolid primary α phase gradually became smaller with its morphology changed from dendritic-like to particle-like or globular-like.

Key words: A356 aluminum alloy La electromagnetic stirring morphology of primary phase fractal

Received: 23 September 2015

Fund: Supported by National Natural Science Foundation of China (Nos.51144009 and 51361012), Natural Science Foundation of Jiangxi Province (No.20114bab206014) and Scientific Research Fund of Education Department of Jiangxi Province (No.GJJ14407)

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	Zheng LIU
	Lina XU
	Zhaofu YU
	Yangzheng CHEN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00496 OR https://www.ams.org.cn/EN/Y2016/V52/I6/698

Fig.1 OM images of primary α phase in A356 alloy before (a) and after (b) electromagnetic stirring without rare earth addition

Fig.2 OM images of primary α phase in A356 alloy with 0.2%La (a), 0.4%La (b), 0.6%La (c) and 0.8%La (d) additions

Fig.3 OM images of primary α phase in A356 alloy under electromagnetic stirring with 0.2%La (a), 0.4%La (b), 0.6%La (c) and 0.8%La (d) additions

Fig.4 Average equal-area circle diameter (a) and shape factor (b) of primary α phase in A356-La alloy before and after electromagnetic stirring

Table 1 Fractal dimensions of morphology of primary phases in semisolid A356 alloy under different conditions

Fig.5 Boundary processed graph (a) and bilogarithmic graph (b) of fractal dimension of primary phase in semisolid A356-0.2%La alloy without electromagnetic stirring (D_B—fractal dimension, N_δ(F_n)—number of intersection with F_n, δ_k—network side length of a cube)

Fig.6 Boundary processed graph (a) and bilogarithmic graph (b) of fractal dimension of primary phase in semisolid A356-0.4%La alloy without electromagnetic stirring

Fig.7 Boundary graph processed (a) and bilogarithmic graph (b) of fractal dimension of primary phase in semisolid A356-0.4%La alloy under electromagnetic stirring

Fig.8 SE-SEM image (a) and EDS (b) of A356-0.4%La alloy

Fig.9 XRD spectrum of A356-0.4%La alloy

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