Effect of strontium on the kinetics of formation and segregation of intermetallic compounds in A380 aluminum alloy
Effect of strontium on the kinetics of formation and segregation of intermetallic compounds in A380 aluminum alloy
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DOI：
10.1016/j.jallcom.2008.11.037
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发表时间：
2009-05
影响因子：
6.2
通讯作者：
S. Shabestari;M. Keshavarz;M. Hejazi
中科院分区：
文献类型：
--
作者：
S. Shabestari;M. Keshavarz;M. Hejazi
研究了未变质和Sr变质状态下A380铝合金熔体中金属间化合物的重力偏析。在电阻炉中，在630°C下研究沉降，沉降时间为30、90和180分钟。利用图像分析技术研究了熔体沉降时间和高度对金属间化合物生成量的影响。Sr改性降低了所有保温时间内熔体底部沉淀金属间化合物的体积百分比、尺寸和数量。合金元素在Sr变质熔体中的分布也比未变质熔体更均匀。在630°C的温度下金属间化合物颗粒的形成和偏析的动力学已经由Avrami和Stokes方程建模。已经表明，Sr改性延迟了熔体中金属间化合物的形成和沉淀。
Gravity segregation of intermetallic compounds in the melt of A380 aluminum alloy has been investigated in both un-modified and Sr-modified states. Sedimentation was investigated at 630°C for settling times of 30, 90, and 180min in an electrical resistance furnace. The effect of settling time and height of melt on the amount of intermetallic compounds was studied by using image analysis. Sr-modification decreases the volume percent, size and number of settled intermetallics at the floor of the melt for all holding times. Distribution of alloying elements in Sr-modified melt is, also, more homogenous than un-modified melt. Kinetics of formation and segregation of intermetallic particles at the temperature of 630°C have been modeled by Avrami and Stokes’ equations. It has been shown that Sr-modification delays the formation and settling of intermetallic compounds in the melt.