Abstract

The study of interfacial structure is a fundamental step to achieve the beneficial structure/property relationship in materials. A knowledge of phase boundaries may provide useful insights for a better understanding of the phase transformation. The O-lattice theory, containing the coincidence site lattice (CSL) model as a subset, has been widely applied and shown to account for boundaries of preferred orientation. Examples include low-Σ CSL grain boundaries with high-Γ (Σ=the ratio between the volumes of unit cells of CSL and the crystal lattice; Γ=the planar density of CSL points), and facets or habit plane of interfaces of precipitates.36 The indices of the crystals adjoining the boundary are commonly used to define the boundary plane. These indices do not reveal a direct connection between the O-lattice planes and the boundaries.This paper emphasizes the application of a simple parameter, Δg, for the study of interfaces and its relationship with the O-lattice planes.

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