Modifying Effect of Ce Addition on Primary Mg2Si Phase in Mg-5Si Alloy

doi:10.11901/1005.3093.2019.080

Chinese Journal of Materials Research

2019, Vol. 33

Issue (9): 683-690 DOI: 10.11901/1005.3093.2019.080

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Modifying Effect of Ce Addition on Primary Mg₂Si Phase in Mg-5Si Alloy

FAN Jinping(

),WANG Hao,WU Gailin,JIANG Yifeng,WANG Hao,LIU Chunlian

College of Materials Science and Engineering，Taiyuan University of Technology，Taiyuan 030024, China

Cite this article:

FAN Jinping,WANG Hao,WU Gailin,JIANG Yifeng,WANG Hao,LIU Chunlian. Modifying Effect of Ce Addition on Primary Mg₂Si Phase in Mg-5Si Alloy. Chinese Journal of Materials Research, 2019, 33(9): 683-690.

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Abstract

The modifying effect of Ce addition on primary Mg₂Si phase in Mg-5Si alloy was investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), optical microscopy (OM), ICP spectrometry and X-ray diffraction (XRD). The results show that the morphology of the primary Mg₂Si phase changed from coarse dendritic shape to polygonal shape with the addition of various amount of Ce. The eutectic Mg₂Si phase changed from Chinese-characters shape to fine fiber shape or dot shape. The optimum modification effect was obtained when the amount of Ce addition was 1.2%. The size of the primary Mg₂Si decreased from 48 μm to 9 μm or less. Whilst, short rod-shaped Mg-Si-Ce compounds were found in the alloy with 1.6% Ce. Ce promotes the nucleation of Mg₂Si, and inhibits its anisotropic growth.

Key words: metallic materials heat resistant magnesium alloy modification Mg₂Si Ce

Received: 23 January 2019

ZTFLH:

TG430.1030

Fund: Technological Development Program of Taiyuan University of Technology(RH19200007);Education Project of Taiyuan University of Technology

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	Jinping FAN
	Hao WANG
	Gailin WU
	Yifeng JIANG
	Hao WANG
	Chunlian LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.080 OR https://www.cjmr.org/EN/Y2019/V33/I9/683

Table 1 Chemical composition of experimental alloys (%, mass fraction)

Fig.1 XRD patterns of Mg-5Si alloy

Fig.2 SEM micrograph of Mg-5Si alloy

Fig.3 Optical micrographs of Mg-5Si alloys modified by 0% Ce (a), 0.8% Ce (b), 1.2% Ce (c) and 1.6% Ce (d)

Fig.4 Average size of primary Mg₂Si particles in investigated alloys

Fig.5 SEM micrographs of primary Mg₂Si in Mg-5Si alloys modified by 0% Ce (a), 0.8% Ce (b), 1.2% Ce (c) and 1.6% Ce (d)

Fig.6 SEM micrograph of alloy modified with 1.6% Ce (a) and EDS analysis of white short rod phase in region A (b)

Fig.7 SEM micrographs of primary Mg₂Si particle (a) unmodified, (b) modified with 1.6% Ce additions and (c) magnified primary Mg₂Si particle in the area C in Fig.7b

Fig.8 Schematic diagram of different outlines of octahedral primary crystal Mg₂Si being cutted (a) rectangle; (b) quadrilateral; (c) hexagon; (d) triangle

Fig.9 SEM micrographs of the primary Mg₂Si phase modified by 1.2% Ce (a) and its EDS line scan results (b), SEM micrographs of the primary Mg₂Si phase modified by 1.6% Ce (c) and its EDS line scan results (d)

Fig.10 Illustration of the growth process of primary Mg₂Si particles

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