Eutectic nucleation in hypoeutectic Al-Si alloys

被引：48
|
作者：
Nafisi, S. [1 ]
Ghomashchi, R. [2 ]
Vali, H. [1 ]
机构：
[1] McGill Univ, Facil Electron Microscopy Res, Montreal, PQ H3A 2B2, Canada
[2] Adv Mat & Proc Res Inst, Major Mackenzie, ON L4S 0A1, Canada
来源：
MATERIALS CHARACTERIZATION | 2008年 / 59卷 / 10期
基金：
加拿大自然科学与工程研究理事会;
关键词：
Al-Si alloys; eutectic; nucleation; modification; FEG-SEM; FIB;
D O I：
10.1016/j.matchar.2008.01.014
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The nucleation mechanism of eutectic grains in hypoeutectic Al-Si foundry alloys has been investigated by examining deep etched specimens in high-resolution field emission gun scanning electron microscope (FEG-SEM) and by using in-situ Focused Ion Beam (FIB) milling and microscopy. Both unmodified and Sr-modified alloys were studied to characterize the nucleation mechanism of eutectic silicon flakes and fibers. It is proposed that following nucleation of eutectic Al on the primary alpha-Al dendrites, fine Si particles form at the solidification front upon which the eutectic Si flakes and fibers could develop. The formation of small Si particles is attributed to Si enrichment of the remaining melt due to the formation of eutectic Al (aluminum spikes) at the eutectic temperature. A hypothesis is then proposed to explain the mechanism of eutectic grains formation with main emphasis on the eutectic Si phase. (C) 2008 Elsevier Inc. All rights reserved.
引用
收藏
页码：1466 / 1473
页数：8
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