| Microstructural formation of semi-solid AZ91D alloy stirred by electromagnetic field |
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| 作者姓名： | Weimin Mao Zisheng Zhen Hongtao Chen Xueyou Zhong |
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| 作者单位： | Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家高技术研究发展计划(863计划)，国家自然科学基金 |
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| 摘 要： | With the help of an electromagnetic stirring device, alloy melt quenching and EBSD (electron back scatter diffraction)analysis technology, the microstructure of the semi-solid AZ91D magnesium alloy slurry stirred by rotational electromagnetic field under different stirring power conditions has been studied. The results show that the size of primary α-Mg phase is reduced obviously when the solidifying alloy melt is stirred by rotational electromagnetic field, moreover, the primary α-Mg grains are changed to fine rosette grains or spherical grains which are proved to belong to the different grains in three-dimension by the EBSD analysis technology. The results also show that the stirring power is an important processing parameter in the preparation of the semi-solid AZ91D magnesium alloy slurry. The larger the stirring power, the finer the primary α-Mg grains, the less the rosette primary α-Mg grains, and the more the spherical primary α-Mg grains. Theoretical analysis indicates that a stronger flow motion leads to a more even temperature field and solute field and a stronger man-made temperature fluctuation in the alloy melt so that the specially fine rosette and/or spherical primary α-Mg grains are formed in the semi-solid AZ91D magnesium alloy slurry.
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| 关 键 词： | AZ91D合金 半固体状态 微观结构 电磁场 |
| 收稿时间： | 2004-09-11 |
Microstructural formation of semi-solid AZ91D alloy stirred by electromagnetic field |
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| Weimin Mao Zisheng Zhen Hongtao Chen Xueyou Zhong.Microstructural formation of semi-solid AZ91D alloy stirred by electromagnetic field[J].Journal of University of Science and Technology Beijing,2005,12(4):329-334. |
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| Authors: | Weimin Mao Zisheng Zhen Hongtao Chen Xueyou Zhong |
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| Abstract: | With the help of an electromagnetic stirring device, alloy melt quenching and EBSD (electron back scatter diffraction) analysis technology, the microstructure of the semi-solid AZ91D magnesium alloy slurry stirred by rotational electromagnetic field under different stirring power conditions has been studied. The results show that the size of primary a-Mg phase is reduced obviously when the solidifying alloy melt is stirred by rotational electromagnetic field, moreover, the primary a-Mg grains are changed to fine rosette grains or spherical grains which are proved to belong to the different grains in three-dimension by the EBSD analysis technology. The results also show that the stirring power is an important processing parameter in the preparation of the semi-solid AZ91D magnesium alloy slurry. The larger the stirring power, the finer the primary a-Mg grains, the less the rosette primary a-Mg grains, and the more the spherical primary a-Mg grains. Theoretical analysis indicates that a stronger flow motion leads to a more even temperature field and solute field and a stronger man-made temperature fluctuation in the alloy melt so that the specially fine rosette and/or spherical primary a-Mg grains are formed in the semi-solid AZ91D magnesium alloy slurry. |
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| Keywords: | AZ91D magnesium alloy electromagnetic stirring microstructure semi-solid |
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