| Project/Area Number |
11225211
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Chiba Institute of Technology |
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Principal Investigator |
MOTEGI Tetsuich Chiba Institute of Technology, Engineering, Professor, 工学部, 教授 (00083824)
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| Co-Investigator(Kenkyū-buntansha) |
TAMURA Yosuke Chiba Institute of Technology, Engineering, Professor, 工学部, 講師 (40316807)
SATO Eiichro Chiba Institute of Technology, Engineering, Professor, 工学部, 教授 (60083820)
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| Project Period (FY) |
1999 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥27,600,000 (Direct Cost: ¥27,600,000)
Fiscal Year 2002: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 2001: ¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 2000: ¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1999: ¥7,700,000 (Direct Cost: ¥7,700,000)
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| Keywords | AZ91D / semi-solid casting / grain refinement / continuous casting / slurry / inclined cooling plate / iron / magnetic field / マグネシウム / リサイクル / 溶解度 / 高純度 / 分離 / 電解マグネシウム / 組織観察 / マグネシウム合金 / セミソリッド / 鋳造組織 / ビレット / チクソキャスティング / 高圧鋳造 / 凝固 / デンドライト / 過熱処理 / 接種法 / 異質核形成 |
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| Research Abstract |
Grain refining of magnesium alloy AZ91 by semi-solid casting was investigated, and semi-solid continuous casting to produce fine-and globular-grained billet was performed. In addition, iron removal by applying of magnetic field was also examined because it could be attributed to improve the reliability of grain refining.
The feature of this semi-solid process is that inclined cooling plate equipped with casting unit gives the semi-solid slurry. When the melt pass through the cooling plate, it makes a numerous number of fine primary particle crystallize out by the cooling effect of the plate and successively dropped as semi-solid slurry into the pre-heated tundish set at the plate end. Such slurry was kept for a given time in the tundish and then quenched into water. Microscopic examination of the as-solidified structure shows that the most desirable structure (60μm in average grain diameter) arises from the following conditions ; casting temperature of 878K, plate length of 200mm and plate angle of 60deg. Further, when continuous casting was applied to the slurry, the billet which is the length of 600mm and the diameter of 40mm, could be successfully obtained.
Generally, iron has precipitated as fine particles in molten magnesium due to its small solubility, e.g., about 0.01% in magnesium at 973K. Therefore, iron removal by electromagnet was examined. A pure iron bar magnetized by electromagnet was inserted into molten Mg-0.05Fe alloy at 973K, and then the melt was as-solidified in the furnace. Metallographic examination suggests that fine iron particle tend to magnetically gather with each other and made some cluster in magnesium.
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