Al-18%Si合金在梯度强磁场中凝固时初生硅的行为

中国有色金属学报, 2005, 15(1): 72-78.

Al-18%Si合金在梯度强磁场中凝固时初生硅的行为

冉新天 ^1, , 任忠鸣 ^2, , 邓康 ^3, , 李喜 ^4, , 李伟轩 ^5,

1.上海大学,材料科学与工程学院,上海,200072

2.上海大学,材料科学与工程学院,上海,200072

3.上海大学,材料科学与工程学院,上海,200072

4.上海大学,材料科学与工程学院,上海,200072

5.上海大学,材料科学与工程学院,上海,200072

基金项目: 国家自然科学基金(50234020,50225416,59871026) 科技部"攀登计划"(04DZ14002)

关键词：梯度磁场 , Al-18％Si合金 , 磁场力 , 凝固

Behavior of primary Si of Al-18%Si alloy in high gradient magnetic field

研究了Al-18%Si合金在10 T梯度强磁场下加热至半固态和全熔态后的凝固过程,观察了初生硅的分布和形态,测定了其冷却曲线.结果表明:在磁场的磁感应强度和磁场梯度的乘积Bz·dBz/dz为正时,初生硅向上部聚集;而在Bz·dBz/dz为负时,初生硅向下部聚集;在强磁场下,加热至全熔态冷却下来的凝固组织中初晶硅的形态发生了明显的改变,由板片状转变为块状,初晶硅显著细化.对强磁场细化初晶硅的机制进行了探讨.

参考文献

[1]	Mikelson A E;Karklin Y K .Control of crystallization processes by means of magnetic fields[J].Journal of Crystal Growth,1981,52:524-529.
[2]	Rango P D;Lee M;Lejay P et al.Texturing of magnetic materials at high temperature by solidification in a magnetic field[J].Nature,1991,349:770-775.
[3]	Farrel D E;Chandrasekhar B S;De Guire M R et al.Superconducting properties of aligned crystalline grain of Y1Ba2Cu3O7-δ[J].Physical Review B,1987,36(07):4025-4027.
[4]	Moreau R.Magnetohydrodynamics[M].Dordrecht:Kluwer Academic Publishers,1990:77-82.
[5]	Yasuda H;Ohnaka I;Yamamoto Y .Alignment of BiMn crystal orientation in Bi-20at% Mn alloys by laser melting under a magnetic field[J].MATERIALS TRANSACTIONS,2003,44(01):2207-2214.
[6]	Kimura T .Study on the effect of magnetic fields on polymetric materials and its application[J].Polymer Journal,2003,35(11):823-828.
[7]	Legrand BA.;Delabathie RP.;Tournier R.;Chateigner D. .ORIENTATION BY SOLIDIFICATION IN A MAGNETIC FIELD - A NEW PROCESS TO TEXTURE SMCO COMPOUNDS USED AS PERMANENT MAGNETS[J].Journal of Magnetism and Magnetic Materials,1997(1/2):20-28.
[8]	Tournier R .Method for Preparing a Very High Quality Magnetic Material[P].US:5366566,1994.
[9]	王晖,任忠鸣,邓康,徐匡迪.磁场对Bi-Mn合金两相区中MnBi相凝固组织的影响[J].金属学报,2002(01):41-46.
[10]	李喜,任忠鸣,王晖,李伟轩,邓康,壮云乾.强磁场下Bi-Mn合金中形成的MnBi相凝固组织[J].金属学报,2004(01):40-45.
[11]	Beaugnon E;Tournier R .Levitation of organic materials steady shine[J].Nature,1991,349(07):470.
[12]	Kensuke S;Norihisa W;Asai S.Elimination of inclusions in a molten metal by using a high magnetic field[A].San Francisco:TMS,2000:565.
[13]	Masahiro Tahashi;Kensuke Sassa;Shigeo Asai .The Effect of a High Magnetic Field on Surface Aspect of Vapor-Deposited Films of Bismuth and Zinc[J].Materials transactions,2002(11):2813-2817.
[14]	任忠鸣;苏辉;金俊泽 .合金在磁场中凝固时生成的特殊表面[J].金属学报,1990,26:B374-B376.
[15]	YUTAKA K;Kouichi T;Ikuto M et al.Anisotropic effect of magnetohydrodynamics on metal solidification[J].ISIJ International,1990,30(01):3-8.

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材料期刊网

Al-18%Si合金在梯度强磁场中凝固时初生硅的行为

Behavior of primary Si of Al-18%Si alloy in high gradient magnetic field

参考文献