Phase-field modeling of grain-boundary premelting using obstacle potentials
Phase-field modeling of grain-boundary premelting using obstacle potentials
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DOI：
10.1103/physreve.90.012401
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发表时间：
2014-07-03
影响因子：
2.4
通讯作者：
Spatschek, R.
中科院分区：
文献类型：
--
作者：
Bhogireddy, V. Sai Pavan Kumar;Hueter, C.;Spatschek, R.
我们研究了施泰因巴赫和Pezzolla [Physica D 134，385（1999）]的多阶参数相场模型描述晶界预熔的能力。对于一个单一的序参数的情况下，固-熔界面总是有吸引力的，这使得我们有（不稳定的）平衡固-熔-固共存高于体熔点。描述界面相互作用的温度依赖的熔体层厚度和分离势受热耦合函数的选择和定义液相量的措施的影响。由于严格有限的界面厚度，相互作用范围也是有限的。对于一个多阶参数模型，我们发现纯粹的吸引力或纯粹的排斥有限范围的相互作用。预熔过渡，然后直接链接到晶界和固-熔界面能的比率。
We investigate the multiorder parameter phase field model of Steinbach and Pezzolla [Physica D 134, 385 (1999)] concerning its ability to describe grain boundary premelting. For a single order parameter situation solid-melt interfaces are always attractive, which allows us to have (unstable) equilibrium solid-melt-solid coexistence above the bulk melting point. The temperature-dependent melt layer thickness and the disjoining potential, which describe the interface interaction, are affected by the choice of the thermal coupling function and the measure to define the amount of the liquid phase. Due to the strictly finite interface thickness the interaction range also is finite. For a multiorder parameter model we find either purely attractive or purely repulsive finite-ranged interactions. The premelting transition is then directly linked to the ratio of the grain boundary and solid-melt interfacial energy.