Abstract
Field-ion evidence is presented which shows that the disturbance at high angle boundaries in iron and iron-carbon alloys is generally confined to a width of less than three atom diameters. Field-ion micrographs from iron specimens showing grain boundaries have been subjected to a full crystallographic analysis where this was possible and a correlation obtained with the coincidence site lattice model. In one particular case where this full analysis was made to a stated accuracy one extension to the theory is confirmed. Namely that a boundary which is maeroscopically curved will on a microscopic scale show good fit if it exists on a series of the more densely packed planes of the coincidence site lattice.
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