Feathery grain growth during solidification under forced flow conditions
Feathery grain growth during solidification under forced flow conditions
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DOI：
10.1016/j.actamat.2007.02.030
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发表时间：
2007-06
期刊：
影响因子：
9.4
通讯作者：
A. N. Turchin;M. Zuijderwijk;J. Pool;D. Eskin;L. Katgerman
中科院分区：
文献类型：
--
作者：
A. N. Turchin;M. Zuijderwijk;J. Pool;D. Eskin;L. Katgerman
Al-4.5% Cu 合金凝固过程中形成的晶粒形态通常表现为柱状或等轴枝晶。在凝固过程中某些热和流动条件下形成的结构中发现了孪生羽毛状晶粒。在这项工作中，这些条件是在强制流动下在型腔中凝固过程中实现的。通过包含凝固的流体动力学模拟和实验来研究羽状晶粒的形成。为了确定羽毛状晶粒的晶体取向，进行了电子背散射衍射测量。通过垂直且平行于生长方向的观察来分析羽毛状颗粒的生长特征。获得了孪生羽毛状形态、流动和凝固参数之间的一些相关性。
The grain morphology developed during solidification of an Al–4.5% Cu alloy is represented generally by columnar or equiaxed dendrites. Twinned feathery grains are found in the structure formed under certain heat and flow conditions during solidification. In this work, these conditions were achieved during solidification in a cavity under forced flow. Feathery grain formation is studied by means of fluid dynamics simulations with solidification included and by experiments. In order to determine the crystallographic orientation of feathery grains, electron backscattered diffraction measurements were performed. The growth features of feathery grains were analyzed by observations made normal and parallel to the growth direction. Some correlations between twinned feathery morphology, flow and solidification parameters were obtained.