Effect of Graphite Powder Amount on Surface Films Formed on Molten AZ91D Alloy

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	Effect of Graphite Powder Amount on Surface Films Formed on Molten AZ91D Alloy
	Li, Weihong; Zhou, Jixue; Ma, Baichang; Wang, Jinwei; Wu, Jianhua; Yang, Yuansheng; Li, WH (reprint author), Shandong Acad Sci, Adv Mat Inst, Shandong Key Lab High Strength Lightweight Metall, Jinan 250014, Shandong, Peoples R China.
	2017-10-01
发表期刊	SPRINGER
ISSN	1073-5615
卷号	48 期号:5 页码:2564-2573
摘要	Graphite powder was adopted to prevent AZ91D magnesium alloy from oxidizing during the melting and casting process. The microstructure of the resultant surface films formed on the molten alloy protected by 0, 2.7, 5.4, 8.1, and 10.8 g dm(-2) graphite powder at 973 K (700 A degrees C) for holding time of 30 minutes was investigated by scanning electron microscopy, energy dispersive spectrometer, X-ray diffraction, and the thermodynamic method. The results indicated that the surface films were composed of a protective layer and the underneath MgF2 particles with different morphology. The protective layer was continuous with a thickness range from 200 to 550 nm consisting of magnesium, oxygen, fluorine, carbon, and a small amount of aluminium, possibly existing in the form of MgO, MgF2, C, and MgAl2O4. The surface films were the result of the interaction between the graphite powder, the melt, and the ambient atmosphere. The unevenness of the micro surface morphology and the number and size of the underneath MgF2 particles increased with graphite powder amount. The mechanism of the effect of graphite powder amount on the resultant surface films was also discussed.; Graphite powder was adopted to prevent AZ91D magnesium alloy from oxidizing during the melting and casting process. The microstructure of the resultant surface films formed on the molten alloy protected by 0, 2.7, 5.4, 8.1, and 10.8 g dm(-2) graphite powder at 973 K (700 A degrees C) for holding time of 30 minutes was investigated by scanning electron microscopy, energy dispersive spectrometer, X-ray diffraction, and the thermodynamic method. The results indicated that the surface films were composed of a protective layer and the underneath MgF2 particles with different morphology. The protective layer was continuous with a thickness range from 200 to 550 nm consisting of magnesium, oxygen, fluorine, carbon, and a small amount of aluminium, possibly existing in the form of MgO, MgF2, C, and MgAl2O4. The surface films were the result of the interaction between the graphite powder, the melt, and the ambient atmosphere. The unevenness of the micro surface morphology and the number and size of the underneath MgF2 particles increased with graphite powder amount. The mechanism of the effect of graphite powder amount on the resultant surface films was also discussed.
部门归属	[li, weihong ; zhou, jixue ; wu, jianhua] shandong acad sci, adv mat inst, shandong key lab high strength lightweight metall, jinan 250014, shandong, peoples r china ; [ma, baichang ; wang, jinwei] shandong acad sci, shandong engn res ctr lightweight automobiles mag, adv mat inst, jinan 250014, shandong, peoples r china ; [yang, yuansheng] chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china
学科领域	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	National Key Research and Development Program of China [2016YFB0701202, 2016YFB0301105]; Natural Science Foundation of Shandong Province [ZR2016EMB11, ZR2015YL007]; Youth Foundation of Shandong Academy of Sciences [2014QN024]
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/79079
专题	中国科学院金属研究所
通讯作者	Li, WH (reprint author), Shandong Acad Sci, Adv Mat Inst, Shandong Key Lab High Strength Lightweight Metall, Jinan 250014, Shandong, Peoples R China.
推荐引用方式 GB/T 7714	Li, Weihong,Zhou, Jixue,Ma, Baichang,et al. Effect of Graphite Powder Amount on Surface Films Formed on Molten AZ91D Alloy[J]. SPRINGER,2017,48(5):2564-2573.
APA	Li, Weihong.,Zhou, Jixue.,Ma, Baichang.,Wang, Jinwei.,Wu, Jianhua.,...&Li, WH .(2017).Effect of Graphite Powder Amount on Surface Films Formed on Molten AZ91D Alloy.SPRINGER,48(5),2564-2573.
MLA	Li, Weihong,et al."Effect of Graphite Powder Amount on Surface Films Formed on Molten AZ91D Alloy".SPRINGER 48.5(2017):2564-2573.