Analyzing the cooperative growth of intermetallic phases with a curved solidification front

Analyzing the cooperative growth of intermetallic phases with a curved solidification front
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分析具有弯曲凝固前沿的金属间相的协同生长

DOI:
10.1016/j.actamat.2018.08.017
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发表时间:
2018
期刊:
影响因子:
9.4
通讯作者:
Kumar Ankit
Kumar Ankit
中科院分区:
材料科学1区
文献类型:
--
作者:
Sumanth Nani Enugala;Britta Nestler;Kumar Ankit

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重新推导了经典的Jackson-Hunt(JH)关系式,将弯曲固液界面的物理作用引入二元金属间共晶层片生长动力学中。半分析的方法是通过探索整个范围内的组合物的兼容性差距。在经典理论中实现的界面形状计算被解释为迭代过程中的第一步,该迭代过程可以在当前扩展分析的框架内进行收敛,从而使理论自洽,并且除了必须输入的三重连接角之外,是独立的。深入分析了低péclet数近似对动力学关系的影响。据发现,由于这种近似的速度的相对误差与péclet数的规模,是独立的固液界面轮廓的形状。将修正理论与经典JH理论预测的NiZr-NiZr 2层状共晶生长动力学进行了比较。
The classical Jackson-Hunt (JH) relation is re-derived to incorporate the physics of curved solid-liquid interfaces on the lamellar growth kinetics of binary intermetallic eutectics. A semi-analytical approach is adopted to explore the entire range of compositions within the miscibility gap. The interface shape calculation implemented in the classical theory is interpreted as a first step in an iterative process which can be carried through to convergence within the framework of the current extended analysis thus rendering the theory self-consistent and, except for the triple junction angles that have to be input, self-contained. The influence of the low péclet number approximation on the kinetics relation is thoroughly analyzed. It is found that the relative error in velocity due to this approximation scales with péclet number and is independent of the shape of the solid-liquid interface profile. Growth kinetics of NiZr-NiZr2lamellar eutectics predicted by the modified theory are compared with those of the classical JH theory.
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发表时间: 1977-10
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