Abstract
The habit plane, orientation relationship (OR) and interfacial structure between the plate-shaped Al6(Mn,Fe) dispersoids and Al matrix in an AA 5182 alloy have been systematically studied by transmission electron microscopy, selected-area electron diffraction and crystallographic simulation. The published OR data about the dispersoids precipitated in different Al alloys has been critically assessed. A precise OR has been determined as (001)p//(3−15)m and [−110]p//[21−1]m, while the habit planes are determined as (001)p and (3−15)m. The OR and habit plane have been discussed in terms of the Δg approach. The dislocation arrangements at the interphase boundary of the habit planes are calculated by using O-lattice theory, which has been used to explain the mechanism of the OR selection and morphology development of dispersoids. It is revealed that an atom-to-atom matching exists in the good matching regions between the dislocations in the habit plane.
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