Eutectic Interface Morphologies of Al-12.5Si Alloy during Directional Solidification

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Eutectic Interface Morphologies of Al-12.5Si Alloy during Directional Solidification
Vol. 34, Issue 9, Pages: 903-906(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.09.043

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[1]黄婉如,廖恒成.定向凝固Al-12.5Si合金的共晶界面形貌[J].特种铸造及有色合金,2014,34(09):903-906.

Huang Wanru, Liao Hengcheng. Eutectic Interface Morphologies of Al-12.5Si Alloy during Directional Solidification. [J]. Special Casting & Nonferrous Alloys 34(9):903-906(2014)
[1]黄婉如,廖恒成.定向凝固Al-12.5Si合金的共晶界面形貌[J].特种铸造及有色合金,2014,34(09):903-906. DOI： 10.15980/j.tzzz.2014.09.043.

Huang Wanru, Liao Hengcheng. Eutectic Interface Morphologies of Al-12.5Si Alloy during Directional Solidification. [J]. Special Casting & Nonferrous Alloys 34(9):903-906(2014) DOI： 10.15980/j.tzzz.2014.09.043.

通过调整合金中Sr和Mg的加入量、温度梯度和凝固速度

对Al-12.5Si合金进行一系列定向凝固试验。结果表明

Sr可以对共晶Si进行变质

得到规则界面

也可以引起界面失稳

因为和Mg一样

其溶质分配系数k01

增加了成分过冷。随Sr或Mg含量增加

共晶界面的演化过程为平界面→胞状晶→树枝晶→等轴晶;随凝固速度增大和温度梯度减小

界面前沿成分过冷变大

界面形貌经历了从失稳到胞晶、树枝晶和等轴晶的转变。

Al-12.5Si alloy was melted for directional solidification.Through adjustment of alloy composition

temperature gradient and solidification velocity

processing parameters for different eutectic morphologies such as eutectoid flat plane

cell grain

columnar grain

equiaxed grain

were presented in directional solidification.The effects of alloy composition

temperature gradient and solidification velocity on eutectic solidification modes were analyzed.

铝硅合金定向凝固共晶界面形貌温度梯度凝固速度

Al-Si AlloyDirectional SolidificationEutectic Interface MorphologyTemperature GradientSolidification Velocity

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