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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Equilibrium geometry of a fluid phase in a polycrystalline aggregate with anisotropic surface energies: Dry grain boundaries
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Equilibrium geometry of a fluid phase in a polycrystalline aggregate with anisotropic surface energies: Dry grain boundaries

机译：具有各向异性表面能的多晶聚集体中液相的平衡几何：干晶界

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The equilibrium distribution of a fluid phase in a rock is controlled by the ratio of grain boundary energy to solid-fluid interfacial energy ("surface energy"). A strong dependence of interfacial energy on interface orientation (anisotropy) is the rule for solid-fluid surfaces of geological interest. We investigated the effects of surface energy anisotropy on the equilibrium interface configuration at the junction of two crystals with a fluid in a two-dimensional solid-fluid system. The two major effects are to promote the development of planar solid-fluid interfaces parallel to crystallographic planes of minimum energy and to lead to large variations of the dihedral angle from one triple junction to the other (as a function of the orientation of crystalline lattices relative to the grain boundary). Despite these large variations, the frequency distributions of equilibrium dihedral angles remain unimodal; also the relationship between the mean fluid dihedral angle and the ratio of grain boundary to surface energy is very close to the isotropic law. Even in the most anisotropic systems, the fluid dihedral angle is therefore a parameter of primary importance for predicting the grain-scale geometry of a low-volume fraction of fluid and its mobility. [References: 37]
机译：岩石中流体相的平衡分布是由晶界能与固体-流体界面能（“表面能”）之比控制的。界面能量对界面取向（各向异性）的强烈依赖性是具有地质意义的固体流体表面的规则。我们研究了二维固体-流体系统中表面能各向异性对两种晶体与流体交界处平衡界面构型的影响。这两个主要作用是促进平行于最小能量晶体平面的平面固体-流体界面的发展，并导致二面角从一个三重结到另一个的二面角的大变化（作为晶格相对位置的函数）到晶界）。尽管存在这些大的变化，但平衡二面角的频率分布仍保持单峰。平均流体二面角与晶界与表面能之比之间的关系也非常接近各向同性定律。因此，即使在大多数各向异性系统中，流体二面角也是预测小体积流体及其流动性的晶粒尺度几何形状的最重要参数。 [参考：37]

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