Current Research and Future Prospect on Microstructures Controlling of High Performance Magnesium Alloys During Solidification

doi:10.11900/0412.1961.2017.00503

Acta Metall Sin

2018, Vol. 54

Issue (5): 637-646 DOI: 10.11900/0412.1961.2017.00503

Special Issue for the Solidification of Metallic Materials

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Current Research and Future Prospect on Microstructures Controlling of High Performance Magnesium Alloys During Solidification

Guohua WU(

), Yushi CHEN, Wenjiang DING

National Engineering Research Center of Light Alloys Net Forming, State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China

Cite this article:

Guohua WU, Yushi CHEN, Wenjiang DING. Current Research and Future Prospect on Microstructures Controlling of High Performance Magnesium Alloys During Solidification. Acta Metall Sin, 2018, 54(5): 637-646.

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Abstract

The researches on development, application and solidification microstructures of high performance magnesium (Mg) alloys have received considerable interest recently. The solidification microstructures of Mg alloys can be effectively controlled by using directional solidification technology, rapid solidification technology and the application of external field during solidification, and thus the enhanced comprehensive mechanical properties of the materials are obtained. The current researches on solidification microstructure controlling of high performance Mg alloys by using directional solidification technology, rapid solidification technology and electromagnetic stirring were reviewed. Finally, the development trend on the controlling of solidification microstructure was proposed.

Key words: magnesium alloy solidification microstructure directional solidification rapid solidification electromagnetic stirring

Received: 28 November 2017

ZTFLH:

TG146.2

Fund: Supported by National Natural Science Foundation of China (No.51775334)

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	Guohua WU
	Yushi CHEN
	Wenjiang DING

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00503 OR https://www.ams.org.cn/EN/Y2018/V54/I5/637

Fig.1 Segmented primary α-Mg columnar dendrite and its secondary arms from sCT tomogram of a directionally solidified Mg-38%Zn alloy^[7](a) expected six-fold crystallography and growth directions
(b) 3D rendering of the seven secondary arm side branches marked D1~D7, growth direction into the page
(c) primary dendrite oriented in the vertical direction
(d~j) morphologies of each of the seven secondary arms side branches and their angles relative to the stem (Figs.1d, f and i: ~54°; Figs.1e and j: ~81°; Figs.1g and h: ~60°; Figs.1d~j have the same scale)

Fig.2 Microstructural evolutions in solidification of Mg-6%Gd alloy under cooling rates R=0.033 K/s (a1~a3), R=0.1 K/s (b1~b3) and R=0.25 K/s (c1~c3) at different time, where t₀ is the beginning time of solidification^[19]

Table 1 Representative Mg-based amorphous alloys and the thermodynamic data^[26,34~49]

Fig.3 Representative micrographs of the NZ30 alloy slurries at different stirring time of 30 s (a), 60 s (b), 120 s (c) and 180 s (d)^[75]

Fig.4 Schematic diagram showing the formation of primary α-Mg phases in NZ30 alloy slurries during electromagnetic stirring^[75]

Fig.5 Microstructures of AZX912 semi-solid slurry prepared by gas bubbling process under different gas flow levels of 2 L/min (a), 4 L/min (b) and 6 L/min (c)^[82]

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