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Effect of Holding Time on Surface Films Formed on Molten AZ91D Alloy Protected by Graphite Powder
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
Source PublicationSPRINGER
ISSN1073-5615
Volume48Issue:5Pages:2334-2342
AbstractGraphite powder was adopted to prevent the AZ91D magnesium alloy from oxidizing during the melting and casting process. The microstructure of the resultant surface films formed at 973 K (700 A degrees C) holding for 0, 15, 30, 45, and 60 minutes was investigated by scanning electron microscopy, energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) after mechanical polishing and chemical etching. The results indicated that the surface films were composed of a protective layer and the underneath particles with different morphology. The protective layer was continuous with a thickness of 200 to 1000 nm mainly consisting of MgO, MgF2, and C, while the underneath particles mainly consisted of MgF2 and MgAl2O4. The surface films were the result of the interaction between the graphite powder, the melt, and the ambient atmosphere. The number and the size of the underneath particles, determining the thickness uniformity of the surface films, and the unevenness of the microsurface morphology increased with holding time. The mechanism of holding time on the resultant surface films was also discussed.; Graphite powder was adopted to prevent the AZ91D magnesium alloy from oxidizing during the melting and casting process. The microstructure of the resultant surface films formed at 973 K (700 A degrees C) holding for 0, 15, 30, 45, and 60 minutes was investigated by scanning electron microscopy, energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) after mechanical polishing and chemical etching. The results indicated that the surface films were composed of a protective layer and the underneath particles with different morphology. The protective layer was continuous with a thickness of 200 to 1000 nm mainly consisting of MgO, MgF2, and C, while the underneath particles mainly consisted of MgF2 and MgAl2O4. The surface films were the result of the interaction between the graphite powder, the melt, and the ambient atmosphere. The number and the size of the underneath particles, determining the thickness uniformity of the surface films, and the unevenness of the microsurface morphology increased with holding time. The mechanism of holding time on the resultant surface films was also discussed.
description.department[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, adv mat inst, shandong engn res ctr lightweight automobiles mag, jinan 250014, shandong, peoples r china ; [yang, yuansheng] chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational 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]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79078
Collection中国科学院金属研究所
Corresponding AuthorLi, WH (reprint author), Shandong Acad Sci, Adv Mat Inst, Shandong Key Lab High Strength Lightweight Metall, Jinan 250014, Shandong, Peoples R China.
Recommended Citation
GB/T 7714
Li, Weihong,Zhou, Jixue,Ma, Baichang,et al. Effect of Holding Time on Surface Films Formed on Molten AZ91D Alloy Protected by Graphite Powder[J]. SPRINGER,2017,48(5):2334-2342.
APA Li, Weihong.,Zhou, Jixue.,Ma, Baichang.,Wang, Jinwei.,Wu, Jianhua.,...&Li, WH .(2017).Effect of Holding Time on Surface Films Formed on Molten AZ91D Alloy Protected by Graphite Powder.SPRINGER,48(5),2334-2342.
MLA Li, Weihong,et al."Effect of Holding Time on Surface Films Formed on Molten AZ91D Alloy Protected by Graphite Powder".SPRINGER 48.5(2017):2334-2342.
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