Role of the coincidence site lattice in grain boundary engineering The PDF

Introduction

The coincidence site lattice (CSL) model was first propounded several decades ago.1 Since then it has become a cornerstone of grain boundary structural research, particularly in cubic materials. Briefly, if the lattices of two grains were allowed notionally to interpenetrate, certain combinations of orientation relationship between the two lattices would result in a periodic array of coinciding sites — an abstraction which becomes physically real at a grain boundary. A boundary with a high density of coincidence points implies 'good fit' of adjacent grains with a concomitant modification of properties such as diffusivity, energy, mobility. The reciprocal density of CSL points is denoted by  Σ (see Chapter 2 for a full description of CSL nomenclature and geometry.)

The widespread acceptance of the CSL model as a tool for grain boundary analysis derives mainly from three sources:

Edited by: Valerie Randle