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Microstructural Characteristics of Mg2Si/Al Composite under Different Superheat and Electromagnetic Stirring
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Microstructural Characteristics of Mg2Si/Al Composite under Different Superheat and Electromagnetic Stirring
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Key Laboratory Foundation of Liaoning Provincial Committee of Education (20060394, 2009S053)

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    摘要:

    在不同的過熱度和電磁攪拌下制備了5% Mg2Si（質量分數(shù)）顆粒增強亞共晶Al-Si 基復合材料，并研究了澆注溫度（過熱度）和電磁攪拌對初生α-Al、(α-Al+Mg2Si)共晶團和共晶Mg2Si形貌和尺寸大小的影響。結果表明，低過熱度與電磁攪拌結合的工藝不僅能夠細化初生α-Al、(α-Al+Mg2Si)共晶團的尺寸，促進它們非枝晶組織的形成，而且還細化了共晶Mg2Si，改變了(α-Al+Mg2Si)兩元共晶的形核方式，從普通鑄造條件下在初生α-Al上形核轉變?yōu)榈瓦^熱度與電磁攪拌下的初生α-Al晶間形核。

    Abstract:

    A hypoeutectic Al-Si matrix composite reinforced by 5wt% Mg2Si was prepared under different superheats and electromagnetic stirring (EMS), and the effects of pouring temperature (superheat) and EMS on the morphology and the grain size distribution of primary α-Al, (α-Al+Mg2Si) eutectic cell and eutectic Mg2Si were investigated. The results show that the low superheat + EMS process refines the grain structure of the primary α-Al and (α-Al+Mg2Si) eutectic cell, promotes the formation of more non-dendritic structure of the phases, as well as refines the eutectic Mg2Si and changes the nucleation mode of (α-Al+Mg2Si) binary eutectic from the nucleation on primary α-Al under conventional casting to the one on nucleant particles in the interdendritic liquid under low superheat + EMS.

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武曉峰,張廣安,伍復發(fā). Microstructural Characteristics of Mg2Si/Al Composite under Different Superheat and Electromagnetic Stirring[J].稀有金屬材料與工程,2015,44(3):576~580.[Wu Xiaofeng, Zhang Guang’an, Wu Fufa. Microstructural Characteristics of Mg2Si/Al Composite under Different Superheat and Electromagnetic Stirring[J]. Rare Metal Materials and Engineering,2015,44(3):576~580.]
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  • 收稿日期:2014-03-25
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  • 在線發(fā)布日期: 2015-05-29
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