Morphological evolution during solidification under stirring
Morphological evolution during solidification under stirring
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DOI：
10.1016/j.actamat.2006.06.013
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发表时间：
2006-10
期刊：
影响因子：
9.4
通讯作者：
Tao Li;Xin Lin;Weidong Huang
中科院分区：
文献类型：
--
作者：
Tao Li;Xin Lin;Weidong Huang
采用原位观察法和淬火实验法，研究了丁二腈-5AT%水透明合金和锡-15wt.%铅合金在机械搅拌条件下凝固过程中的形态演变。结果表明，机械搅拌引起强剪切流时，一次凝固组织呈球状凝固。根据形态稳定性理论，对球状组织的形成机理进行了探讨。分析表明，初生组织在剪切流动中的旋转对固液界面的形态不稳定性起到稳定作用，促进了凝固组织在熔体中形核后的球状长大。
Morphological evolution during the solidification of succinonitrile–5at.% water transparent alloy and Sn–15wt.% Pb alloy under mechanical stirring was investigated experimentally by in situ observation and quenching, respectively. The results showed that the primary microstructures were solidified with a globular shape when mechanical stirring induced strong shear flow. The formation mechanism of the globular microstructure is discussed, according to morphological stability theory. The analysis indicates that the rotation of primary microstructure in a shear flow induces a stabilizing effect on the morphological instability at the solid–liquid interface and promotes the globular growth of solidification microstructure after it is nucleated in the melt.