本研究之目的旨在改善電磁攪拌製程之設備及製程參數，希望在將製程最佳化之後，能得到一可靠而有效的方法製備等軸且晶粒細小的鎂合金電磁攪拌鑄造材，以期能夠應用於後續之成型和加工，最後能達到工業化應用之目標。
本研究最主要探討電磁攪拌製程之製程參數對製備所得之鑄錠外觀、巨觀缺陷和微觀組織的影響。其中製程參數包括：攪拌電流、攪拌時間、冷卻速率、初始冷卻溫度及溫度控制裝置的溫度等等。
藉由設備的改良及製程參數的修正，已對鎂合金鑄錠組織的改善取得初步的成果。

The purpose of this study is to improve the equipment of the electromagnetic stirring process and the parameters of the process. We can get a reliable and effective method to prepare magnesium alloy with equi-axis and tiny grains after optimizing the process. Expect that it could apply to the follow-up forming and manufacturing, then it could be used in industrialization for the final goal.
This study mainly discusses the effects of parameters of the electromagnetic stirring on the morphologies of the ingots, macroscopic defects and microstructures. And processing parameters include the stirring current, the stirring time, the cooling rate, the initial cooling temperature and the temperature of the temperature controller.
By mean of the improvement of the equipment and the revising of the parameters, the improvements of the structures of magnesium alloy have obtained some preliminary achievements.

[1] Malachi. P. Kenny, James A. Courtois, Robet D. Fvants,Gilbert M. Farrior, Semisolid Metal Casting and Forging, Handbook, 9th Ed, vol. 15, pp. 327-338.
[2] M. C. Flemings, "Behavior of Metal Alloys in the Semi-solid State," Metall. Trans. A, vol. 22, pp. 957-981, 1991.
[3] M. C. Flemings, R. G. Riek,K. P. Young, "Rheocasting," Mat. Sci. and Eng., vol. 25, pp. 103-117, 1976.
[4] D. B. Spencer, R. Mehrabian,M. C. Flemings, "Rheological Behavior of Sn-15Pct Pb in the Crystallization Range," Metall. Trans., vol. 3, pp. 1925-1932, 1972.
[5] P. A. Joly,R. Mehrabian, "The Rheology of a Partially Solid Alloy," J. Mat. Sci., vol. 11, pp. 1393-1418, 1976.
[6] S. D. E. Ramati, G. J. Abbaschian,R. Meaarabian, "The Structure of a Partially Solid Alloy," Metall. Trans. B, vol. 9, pp. 241-245, 1978.
[7] M. C. Flemings,S. B. Brown, "Net-Shape Forming Via Semi-solid Processing," Adv. Mat. and Proc., pp. 36-40, 1993.
[8] D. H. Kirkwood,P. Kadranos, "Semi-solid Processing of Alloys," Met. and Mat., pp. 16-19, 1989.
[9] 潘漢宗, "噴覆成型AZ91D鎂合金及其半固態製程之研究," 國立成功大學礦冶及材料科學研究所碩士論文, 2005.
[10] Charles Vives, "Elaboration of Semisolid Alloys by Means of New Electromagnetic Rheocasting Processes," Metall. Trans. B, vol. 23, pp. 189-206, 1992.
[11] M. A. Taha, "Control of contineous Rheocasting Process," J. Mat. Sci., vol. 23, pp. 1379-1390, 1988.
[12] T. Matsumiya,M. C. Flemings, "Modeling of Continuous Strip Production by Rheocasting," Metall. Trans. B, vol. 12, pp. 17-31, 1981.
[13] Nobuyki Mori, Keisaku Ogi,Kimio Matsuda, "On the Apparent Viscosity and Structure of Partially Solidified Al-Cu Alloys under Stirring," j. Japan Inst. Metals, vol. 45, pp. 936-944, 1984.
[14] Masazumi Hirai, Katsuhiro Takebhyashi, Yuiu Yoshikawa,Ryoji Yamaguchi, "Apparent Viscosity of Al-10mass%Cu Semi-Solid Alloys," ISIJ Inter., vol. 33, pp. 405-412, 1993.
[15] A. Assar, Nei-Mahallawy,M. A. Taha, "Influence of Processing Variables on Structure and Porosity in Stir-Casting Al-Cu Alloys," Metals Tech., vol. 9, pp. 165-170, 1982.
[16] J. M. M. Molenaar, F. W. H. C. Salemans,L. Katgerman, "The Structure of Stircast Al-6Cu," j. Mat. Sci., vol. 20, pp. 4335-4344, 1985.
[17] Nobuyuki Genma, Toshiyuki Soejima, Tadashi Saito, Masayasu Kimura, Yasuo Kaihara, Hirohiko Fukomoto,Kenzo Ayata, "The Linear-motor Type In-mold Electromagnetic Stirring Technique for the Slab Continuous Caster," ISIJ Inter., vol. 29, pp. 1056-1062, 1989.
[18] Alec Mitchell,Bernardo Hernardez-Morales, "Electromagnetic Stirring with Alternating Current during Electroslag Remelting," Metall. Trans. B, vol. 21, pp. 723-731.
[19] Eiichi Takeuchi,Takehiko Toh, "Influence of Electro magnetic Pressure on the early Solidification in a Continuous Casting Mold," Liquid Metal Flows, ASME, vol. 115, pp. 19-24, 1991.
[20] H. Lehuy, J. Blain, G. L. Bata,J. Masounave, "Compression of Semisolid Dendritic and Non-dendritic Zn-Al Alloys at Low Strain Rate," J. Mat. Sci., pp. 29-32, 1984.
[21] J. F. Seconde,M. Suery, "Effect of Solidification Condition on Deformation Behavior of Semi-Solid Sn-Pb Alloys," J. Mat. Sci., vol. 19, pp. 3995-4006, 1984.
[22] D. A. Pinsky, P. O. Charreyron,M. C. Flemings, "Compression of Semisolid Dendritic Sn-Pb Alloys at low Strain Rate," Metall. Trans. B, vol. 15, pp. 173-181, 1984.
[23] M. C. Flemings, "New Solidification Processes and Products," Metal Tech., pp. 56-61, 1979.
[24] Garnier M., ISIJ Inter., vol. 30, pp. 1-7, 1990.
[25] Garnier M., "Technological and Economical Challenges Facing EPM in the Next Century," The 3rd International Symposium on Elecromagnetic Processing of Materials, 2000, Nagaya, Japan, ISIJ.
[26] R. D. Doherty, H. Lee,E. Feest, "Microstructure of Stir-Cast Metals," Materials Science and Engineering A, vol. 65, pp. 181-189, 1984.
[27] 徐文敏 彭暄, 蔡浪富, "鎂合金壓鑄的省思與前瞻," 機械工業雜誌, vol. 203, pp. 329-334, 1997.
[28] Gang Wan,P. R. Sahm, "Ostwald ripening in the isothermal rheocasting process," Acta Metallurgica et Materialia, vol. 38, pp. 967-972, 1990.
[29] 謝孟欣, "半固態製程合成304不銹鋼與A356鋁矽合金及其微觀組織與性質之研究," 國立成功大學礦冶及材料科學研究所碩士論文, 1994.
[30] Keuneth P. Young, "United States Patent: 4565241," Jun. 21, 1986.
[31] 楊耀昇, "A356 鋁矽合金之半固態製程:製程參數對其微觀組織黏度及靜凝性之影響," 國立成功大學礦冶及材料科學研究所碩士論文, 1993.
[32] K.-H. Spitzer, "Application of rotating magnetic fields in Czochralski crystal growth," Progress in Crystal Growth and Characterization of Materials, vol. 38, pp. 59-71, 1999.
[33] H.L. Gerber, "Electromagnetic processing of liquid steel," Industry applications, IEEE Transactions on Industry Applications, vol. 33, pp. 801-806, 1997.
[34] ASM Specialty Handbook Magnesium and Magnesium Alloys Ed. by Michael M. Avedesian and Hugh Baker.
[35] H. Baker, Physical Properties of Magnesium and Magnesium Alloys, The Dow Chemical Company, Midland, MI, 1976.