Abstract
Intergranular cracking of aluminum alloys occurs by a variety of processes in a host of structural components. Cracks emanate from holes and corners of support structures and heterogeneously spread along grain boundaries. In the present study, cracked specimens were investigated using local orientation measurement techniques. True representation of grain boundaries in spaces of five or eight dimensions was emphasized in characterizing the microstructure. Orientation of the grain boundary plane with respect to the stress axis and with respect to the crystal lattice was found to play an important role in determining GB “specialness” in addition to misorientation of the crystallite lattices.
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