By V. Randle
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Extra info for Role of the coincidence site lattice in grain boundary engineering, The
E. 2 shows the breakdown of technique usage for all the investigations documented here, and it can be seen that SAC, EBSD and TEM are the principal methods used to characterise grain boundaries. TEM remains suprisingly popular, considering the labour intensity involved in foil preparation and data collection. 2). 2 Distribution of specific experimental techniques used to conduct grain boundary (CSL) investigations on polycrystals during the last 20 years. (Synch. g. TEM or EBSD. From these measurements the misorientation between the two grains can be obtained and then classified in the CSL system by means of the algorithms given in Chapter 2.
If many grains have a 100 texture there will be many grain pairs having a common 100 misorientation axis - simulations have the benefit of providing quantitative data. g. 112 These investigations have shown that the proportion of CSLs generated has essentially the same characteristics for textures modelled in tricrystals (to simulate triple line geometry) and those modelled in two-dimensional, connected polycrystals. A further subtlety found was that texture modifies the misorientation angle more than it does the axis.
14. In this context 'grain boundary features' have been divided into orientation relationships/ phase transformations, grain connectivity, grain boundary statistics, microstructural evolution, texture and twinning. 14. This digest highlights two points: some properties are experimentally more feasible to measure than others, and similarly some properties are of especial commercial/research interest compared to others. It is instructive to consider the range of mechanical, physical and chemical properties attributed to grain boundaries compared to the properties/features which have actually been studied.