Premium
Crystallography of the Mg 2 Y precipitates in a damping Mg–Cu–Mn–Zn–Y alloy
Author(s) -
Huang Xuefei,
Huang Weigang
Publication year - 2016
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576716014953
Subject(s) - vicinal , crystallography , reciprocal lattice , lattice (music) , alloy , materials science , high resolution transmission electron microscopy , transmission electron microscopy , condensed matter physics , chemistry , physics , metallurgy , diffraction , nanotechnology , optics , organic chemistry , acoustics
The crystallography of the Mg 2 Y precipitates in an Mg–Cu–Mn–Zn–Y damping alloy has been characterized by transmission electron microscopy. The novel orientation relationship between Mg 2 Y and the α‐Mg matrix was determined as [0001] p //[0001] α , ⟨100⟩ p //⟨20⟩ α and ⟨010⟩ p //⟨110⟩ α . The precipitate exhibits a polygonal morphology with four pairs of facets, each of which is normal to a Δ g 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.