研究了交流电场、直流磁场和二者复合产生的电磁振荡对A1-18%(质量分数)Si过共晶初晶Si相形貌的影响.结果表明:交流电场、直流磁场和电磁振荡都使合金初晶Si相的大小经历了一次细化过程,交流电场使Si原子有序偏聚团的尺寸和数目发生改变,增大形核率,细化初晶Si相;直流磁场通过电磁制动效应抑制了初晶Si相的形核与长大;电磁振荡细化作用是通过减弱合金的成分过冷和温度梯度从而增大过冷度实现的.三者相比,在电磁振荡的作用下初晶Si相更为细小.
The article is aimed to study the effects of alternating current (AC) electric field, the direct current magnetic field and the composition of both on the primary Si phase of the hypereutectic. The results show that AC field, the direct current magnetic field and electromagnetic vibration can all lead to the refining process of the size of the hypereutectic Al-Si alloy. AC electric field changes both the size and amount of silicon atom clusters, increases the nucleation rate, and refines the primary Si phase. The direct current magnetic field restrains the nucleation and growth of the primary Si phase through the effect of electromagnetic braking. The refinement of the electromagnetic vibration increases the degree of supercooling through weakening the constitutional supercooling of the alloy and the temperature gradient. Comparatively, the primary Si phase tends to be smaller under the effect of electromagnetic vibration.
参考文献
| [1] | ВАЩЕНКАКИ.Влияниевоздействияэлектрическоготокаприкристаллизациичугунанасвойстваотливок[J].ЛитейноеПроизводство,1973(02):27-29. |
| [2] | AHMED S;BOND R;MCKANNAN E C .Solidification processing superalloys in an electiec field[J].Advanced Materials and Processes,1991,10:30-38. |
| [3] | AHMED S;MCKANNAN E C .Control of γ′morphology in nickel base superalloys through alloy design and densification processing under electric field[J].Materials Science and Technology,1994,10:941-946. |
| [4] | A.PRODHAN;C.S.SIVARAMAKRISHNAN;A.K.CHAKRABARTI .Solidification of Aluminum in Electric Field[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2001(2):372-378. |
| [5] | LANGENBERG F C;PESTEL G;HONEYCUTT C R .Grain refinement of steel ingots by solidification in a moving electromagnetic field[J].Transactions of the Metallurgical Society of ALME,1961,221:993-1001. |
| [6] | 朱明原;史文;杨森龙.电磁搅拌作用对铝合金显微组织的影响[J].中国有色金属学报,1999(z1):29-34. |
| [7] | 毛卫民,李树索,赵爱民,崔成林,王德仁,钟雪友.电磁搅拌Al-24%Si合金的显微组织[J].中国有色金属学报,2001(05):819-823. |
| [8] | 张勤,崔建忠,路贵民,张北江.电磁振荡强度对半连铸7075铝合金微观组织的影响[J].中国有色金属学报,2002(z1):222-226. |
| [9] | 余建波,任忠鸣,任维丽,邓康,钟云波,王洪亮.强磁场下电磁振荡对Al-Si过共晶合金凝固中初生硅分布和形貌的影响[J].金属学报,2007(09):994-998. |
| [10] | VIVES C .Effects of electromagnetic vibrations on the microstructure of continuously cast aluminum alloys[J].Materials Science and Engineering,1993,A173:169-172. |
| [11] | Vives C. .CRYSTALLIZATION OF ALUMINIUM ALLOYS IN THE PRESENCE OF CAVITATION PHENOMENA INDUCED BY A VIBRATING ELECTROMAGNETIC PRESSURE[J].Journal of Crystal Growth,1996(1/2):118-127. |
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