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The crystallography of the Mg2Y precipitates in an Mg–Cu–Mn–Zn–Y damping alloy has been characterized by transmission electron microscopy. The novel orientation relationship between Mg2Y and the α-Mg matrix was determined as [0001]p//[0001]α, 〈10
0〉p//〈2
0〉α and 〈010〉p//〈11
0〉α. The precipitate exhibits a polygonal morphology with four pairs of facets, each of which is normal to a Δg vector in reciprocal space. The secondary constrained coincidence site lattice model was employed to examine the preference of each facet. The results show that a much better degree of lattice matching is realized across each facet than their vicinal orientations, indicating the energetically favoured feature of the interface. The configurations of the misfit-compensating dislocations across each interface were also calculated using the O-lattice model.
0〉p//〈2
0〉α and 〈010〉p//〈11
0〉α. The precipitate exhibits a polygonal morphology with four pairs of facets, each of which is normal to a Δg vector in reciprocal space. The secondary constrained coincidence site lattice model was employed to examine the preference of each facet. The results show that a much better degree of lattice matching is realized across each facet than their vicinal orientations, indicating the energetically favoured feature of the interface. The configurations of the misfit-compensating dislocations across each interface were also calculated using the O-lattice model.
