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arXiv 0712.0751cond-mat.mtrl-sci
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沿晶界熔化合金

Melting of alloys along grain boundaries

Efim A. Brener, D. E. Temkin

摘要:

本文将合金沿晶界的熔化作为两个移动固液界面的自由边界问题来讨论。其中一个是熔化前沿,另一个是凝固前沿。三联点的存在在控制该过程的速度方面起着重要作用。界面通过它们之间的薄液体层中的扩散场强烈地相互作用。在液膜迁移(LFM)机制中,系统选择了一个更有效的动力学路径,该路径由液膜中相对短距离的扩散控制。然而,只有弱相干应变能的情况下,单相合金熔化的LFM的有效驱动力。只有一个熔化前沿的过程将由在相对大的距离上在母固相中的非常缓慢的扩散控制。

英文摘要:

We discuss melting of alloys along grain boundaries as a free boundary problem for two moving solid-liquid interfaces. One of them is the melting front and the other is the solidification front. The presence of the triple junction plays an important role in controlling the velocity of this process. The interfaces strongly interact via the diffusion field in the thin liquid layer between them. In the liquid film migration (LFM) mechanism the system chooses a more efficient kinetic path, which is controlled by diffusion in the liquid film on relatively short distances. However, only weak coherency strain energy is the effective driving force for LFM in the case of melting of one-phase alloys. The process with only one melting front would be controlled by the very slow diffusion in the mother solid phase on relatively large distances.

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