In general, high-angle grain boundaries (HAGBs) are easier to migrate than low-angle grain boundaries (LAGBs).
HAGBs are characterized by a large misorientation angle between adjacent grains, typically greater than 10 degrees. These boundaries have a higher energy and are more mobile than LAGBs. The reason for this is that HAGBs are composed of a larger number of dislocations, which are defects in the crystal lattice that can move through the material to allow for boundary motion. The large number of dislocations in HAGBs means that they can move more easily, making them more mobile.
In contrast, LAGBs are characterized by a smaller misorientation angle, typically less than 10 degrees. These boundaries have a lower energy and are less mobile than HAGBs. The reason for this is that LAGBs have fewer dislocations than HAGBs, making it more difficult for the boundary to move.
However, it is important to note that the migration of grain boundaries is a complex process that depends on a variety of factors, including the type of material, the temperature, and the applied stress. So, while HAGBs are generally easier to migrate than LAGBs, this may not always be the case in every situation.
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