Pattern formation during diffusional transformations in the presence of triple junctions and elastic effects
Pattern formation during diffusional transformations in the presence of triple junctions and elastic effects
复制标题
在存在三联结和弹性效应的情况下扩散变换过程中的图案形成
DOI：
10.1088/0953-8984/21/46/464106
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
D. Temkin
中科院分区：
文献类型：
--
作者：
E. Brener;G. Boussinot;C. Hüter;M. Fleck;D. Pilipenko;R. Spatschek;D. Temkin
我们比较了不同的情况下，枝晶熔化的合金方面的前端传播速度。与传统的枝晶生长相反，这里的选择也可以是由于晶界或相干应变的存在，并且传播速度更高。最有利的情况是部分熔化，其中两个抛物线前沿，一个熔化和一个凝固界面，一起移动，因为该过程由薄液体层中的扩散决定。在那里，也在相场模拟的熔化在包晶和共晶系统中，我们观察到旋转的三重结相对于生长方向。最后，我们讨论了由于密度和结构差异对固态相变的弹性效应的作用，我们发现它们显着改变的选择原则。特别是，我们得到自由枝晶生长，即使各向同性的表面张力。这是由绿色的功能方法和相场的方法在一个通道中的生长和说明为形成的双相。
We compare different scenarios for dendritic melting of alloys with respect to the front propagation velocity. In contrast to conventional dendritic growth, selection can here be also due to the presence of a grain boundary or coherence strains, and the propagation speed is higher. The most favorable situation is partial melting, where two parabolic fronts, one melting and one solidifying interface, are moving together, since the process is then determined by diffusion in the thin liquid layer. There, and also in phase field simulations of melting in peritectic and eutectic systems, we observe a rotation of the triple junction relative to the growth direction. Finally, we discuss the role of elastic effects due to density and structural differences on solid-state phase transformations, and we find that they significantly alter the selection principles. In particular, we obtain free dendritic growth even with isotropic surface tension. This is investigated by Green’s function methods and a phase field approach for growth in a channel and illustrated for the formation of a twin phase.