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電磁離心鑄造Al-20Si過共晶合金中硅相組織演變規(guī)律
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國家自然科學基金資助項目（50474048）


Microstructure Evolution of Primary Si Phase in Hypereutectic Al-20Si Alloys Prepared by Centrifugal Casting under an Electromagnetic Field
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    摘要:

    采用電磁離心鑄造的方法制備了Al-20Si（質(zhì)量分數(shù)，下同）過共晶合金空心管坯，研究了電磁場對合金凝固組織及硅相形貌的影響。結(jié)果表明，隨磁場強度增加鑄坯外側(cè)硅相聚集層厚度不斷減小；與傳統(tǒng)離心鑄造的鋁硅過共晶合金微觀組織相比，施加電磁場后凝固組織中初晶硅相得到細化，外側(cè)硅相形貌逐漸由典型的五瓣星形成為沿熱流方向生長的初晶硅枝晶，內(nèi)側(cè)硅相受到電磁攪拌作用發(fā)生合并凝聚和鈍化；初晶硅相尺寸及形狀因子隨磁場強度增加在不斷減小。電磁攪拌破壞了硅相呈放射狀排列的結(jié)構(gòu)，共晶硅分布雜亂，且共晶團共晶片層間距逐漸增加。

    Abstract:

    Hypereutectic Al-20Si (mass fraction) alloy hollow tubes were prepared by centrifugal casting under an electromagnetic field (EMF). Effects of EMF on the solidification microstructure of the alloy and morphology of primary Si phases were investigated. Results show that primary Si phases in the solidification microstructure were refined after applying EMF compared with the microstructure of the Al-20Si hypereutectic alloys by conventional centrifugal casting. The segregation layer width of Si phases in the outer of the tube decreased gradually with the increase of the EMF intensity. The morphology of the Si phases in the outer of the tube changed from typical pentagram into dendrites grown along the heat flow direction. The phenomena of dulling and congregation of the Si phases in the inner of the tube were found due to EMF stirring. The size and aspect ratio of the primary Si phase decreased little by little with the increase of EMF intensity. The electromagnetic stirring destroyed the radial configuration of Si phases, eutectic Si phases distributed randomly, and the eutectic lamina spaces in the eutectic cell increased gradually.

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張志清,李丘林,劉 偉,劉 慶.電磁離心鑄造Al-20Si過共晶合金中硅相組織演變規(guī)律[J].稀有金屬材料與工程,2009,38(10):1769~1773.[Zhang Zhiqing, Li Qiulin, Liu Wei, Liu Qing. Microstructure Evolution of Primary Si Phase in Hypereutectic Al-20Si Alloys Prepared by Centrifugal Casting under an Electromagnetic Field[J]. Rare Metal Materials and Engineering,2009,38(10):1769~1773.]
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  • 收稿日期:2009-06-04
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