Growth Mechanism of Al-Si Eutectic Alloy

Sun Weicheng  Zhang Shurong  Zhang Guifang

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Growth Mechanism of Al-Si Eutectic Alloy
Issue 5, (1996)
Published： 1996 ，
DOI：

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[1]孙伟成,张淑荣,张桂芳,李恒武.铝硅二元合金的共生生长机制[J].特种铸造及有色合金,1996(05):11-13.

Sun Weicheng Zhang Shurong Zhang Guifang. Growth Mechanism of Al-Si Eutectic Alloy. [J]. Special Casting & Nonferrous Alloys (5).(1996)
[1]孙伟成,张淑荣,张桂芳,李恒武.铝硅二元合金的共生生长机制[J].特种铸造及有色合金,1996(05):11-13. DOI：

Sun Weicheng Zhang Shurong Zhang Guifang. Growth Mechanism of Al-Si Eutectic Alloy. [J]. Special Casting & Nonferrous Alloys (5).(1996) DOI：

摘要

观察分析了铝硅二元共晶合金的显微结构。发现在不同凝固条件下凝固的共晶硅形貌虽然有极显著的差别，但它们的基本结构是相同的——铝硅二元合金共生生长成共晶团；共晶团的核心部分基本上相同；共晶团的尺寸与冷却速度和变质处理有关。稀土元素主要富集在共晶团的周界处，促使晶体缺陷增多，导致分枝急剧增加，从而使共晶硅由各向异性生长特性转变为各向同性生长特性。

Abstract

The microstructure of a Al Si eutectic alloy has been investigated by TEM

SEM and EPMA.It is found that basic structures of eutectic cluster cores in different solidification conditions are identical although their outside morphelogies are different.The size of the eutectic cluster is related to cooling rate and modification of the alloy. The analysis result reveals that RE elements are mainly enriched in the circumambiency of the eutectic clusters.Which increase both crystal defect and dendrite

thus leading to a transition of the eutectic Si from anisotropy to isotropy.