Effect of Melt Temperature on Surface Films Formed on Molten AZ91D Alloy Protected by Graphite Powder
文献类型：期刊论文
| 作者 | 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. |
| 刊名 | SPRINGER
 |
| 出版日期 | 2017-12-01 |
| 卷号 | 48期号:6页码:3152-3160 |
| ISSN号 | 1073-5615 |
| 英文摘要 | Graphite powder was adopted to prevent AZ91D alloy from oxidizing during melting and casting. The microstructure of the resultant surface films, formed at 933 K, 973 K, 1013 K, and 1053 K (660 A degrees C, 700 A degrees C, 740 A degrees C, and 780 A degrees C) for 30 minutes, was investigated by scanning electron microscopy, energy dispersive spectrometer, and X-ray diffraction, and the phase composition of the surface films was analyzed by the standard Gibbs free energy change of the reactions between the graphite powder, the alloy melt, and the ambient atmosphere. The effect and mechanism of melt temperature on the resultant surface films were also discussed. The results indicated that the surface films, of which the surface morphology comprised folds and wrinkles, were composed of a protective layer and MgF2 particles. The protective layer was contributive to the prevention of the molten alloy from oxidizing, and consisted of magnesium, oxygen, fluorine, carbon, and a small amount of aluminium existing in the form of MgO, MgF2, C, and MgAl2O4. The layer thickness was 200 to 900 nm. The melt temperature may affect the surface films through the increased interaction between the graphite powder, the melt, and the ambient atmosphere. The oxygen content and thickness of the protective layer decreased and then increased, while the height of the folds increased with melt temperature.; Graphite powder was adopted to prevent AZ91D alloy from oxidizing during melting and casting. The microstructure of the resultant surface films, formed at 933 K, 973 K, 1013 K, and 1053 K (660 A degrees C, 700 A degrees C, 740 A degrees C, and 780 A degrees C) for 30 minutes, was investigated by scanning electron microscopy, energy dispersive spectrometer, and X-ray diffraction, and the phase composition of the surface films was analyzed by the standard Gibbs free energy change of the reactions between the graphite powder, the alloy melt, and the ambient atmosphere. The effect and mechanism of melt temperature on the resultant surface films were also discussed. The results indicated that the surface films, of which the surface morphology comprised folds and wrinkles, were composed of a protective layer and MgF2 particles. The protective layer was contributive to the prevention of the molten alloy from oxidizing, and consisted of magnesium, oxygen, fluorine, carbon, and a small amount of aluminium existing in the form of MgO, MgF2, C, and MgAl2O4. The layer thickness was 200 to 900 nm. The melt temperature may affect the surface films through the increased interaction between the graphite powder, the melt, and the ambient atmosphere. The oxygen content and thickness of the protective layer decreased and then increased, while the height of the folds increased with melt temperature. |
| 学科主题 | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| 资助机构 | 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] |
| 公开日期 | 2018-01-10 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/78956]  |
| 专题 | 金属研究所_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 Melt Temperature on Surface Films Formed on Molten AZ91D Alloy Protected by Graphite Powder[J]. SPRINGER,2017,48(6):3152-3160. |
| APA | Li, Weihong.,Zhou, Jixue.,Ma, Baichang.,Wang, Jinwei.,Wu, Jianhua.,...&Li, WH .(2017).Effect of Melt Temperature on Surface Films Formed on Molten AZ91D Alloy Protected by Graphite Powder.SPRINGER,48(6),3152-3160. |
| MLA | Li, Weihong,et al."Effect of Melt Temperature on Surface Films Formed on Molten AZ91D Alloy Protected by Graphite Powder".SPRINGER 48.6(2017):3152-3160. |
入库方式： OAI收割
来源：金属研究所
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