为了确定磁场对铝合金凝固过程的影响,利用双电桥测试了Al-21%Cu、Al-22Si合金分别在无磁场、直流磁场和交流磁场作用下从液态到固态的电阻变化.分析了Al-Cu合金与Al-Si合金电阻-温度曲线的差别,研究了磁场对合金凝固过程中液、固相线温度及微观结构的影响.结果表明,Al-21%Cu合金的电阻-温度曲线呈单调下降趋势,且有两个明显的转折点,而Al-22%Si合金的电阻-温度曲线不再是单调下降,两个转折点也很不明显,在直流磁场作用下,Al-21%Cu、Al-22%Si合金的液相线、固相线温度均有所降低,在交流磁场作用下,两种铝合金的液、固相线温度均有所升高.在Al-Si合金凝固过程中施加外磁场时,抑制了初生β-Si的生成.
参考文献
| [1] | MISRA A K .A novel solidification technique of metals and alloys:under the influence of applied potential[J].Metallurgical & Materials Transactions A:Physical Metallurgy & Materials Science,1985,16A:1354-1355. |
| [2] | AHMED S;BOND R;MCKANNAN E .Solidification processing superalloys in an electric field[J].Advanced Materials & Processes,1991,10:30-32. |
| [3] | BARNAK J P;SPRECHER A F;CONRAD H .Colony size reduction in eutectic Pb-Sn casting by electropulsing[J].Scripta Metallurgica et Materialia,1995,32:879-884. |
| [4] | VIVES C .Effect of electromagnetic vibrations on microstructure of continuously cast aluminum alloys[J].Materials Science and Engineering,1993,A173:169-172. |
| [5] | Bingtao Z.I.;Qixian B.A. .STUDY ON AXIAL CHANGES OF AS-CAST STRUCTURES OF AL-ALLOY SAMPLE TREATED BY THE NOVEL SPMF TECHNIQUE[J].Scripta materialia,2000(4):377-380. |
| [6] | RADJAI A;MIWA K .Effect of intensity and frequency of electromagnetic vibration on the microstructural refinement of hypoeutectic Al-Si alloys[J].Metallurgical & Materials Transactions A:Physical Metallurgy & Materials Science,2000,31A:755-762. |
| [7] | 陈洪荪.金属物理性能及测试方法[M].北京:冶金工业出版社,1987 |
| [8] | 王润.金属材料物理性能[M].北京:冶金工业出版社,1993 |
| [9] | 陆栋;蒋平;徐至中.固体物理学[M].上海:上海科学技术出版社,2003 |
| [10] | SHIMOJI M.Liquid metals[M].London,UK:Academic Press,1977 |
| [11] | IIDA T.The physical properties of liquid metals[M].New York:Oxford Univeristy Press,1988 |
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