Abstract
Aging of MgNd alloys involves the formation of Guinier-Preston zones followed by β‴ precipitation that is associated with peak hardness. Using atom probe tomography and high-angle annular dark-field scanning transmission electron microscopy, the three-dimensional morphologies of the coherent Guinier-Preston zones and β‴ precipitates were quantified. The Guinier-Preston zones form equiaxed plates while the β‴ precipitates are elongated along the [0001]Mg direction thereby minimizing elastic strains. The β‴ precipitates exhibit additional faceting along the [0001]Mg direction and along the 11̅01Mg and 11̅02Mgdirections when viewed along the 112̅0Mg zone axes, which can be affected by strain field interactions from nearby precipitates.
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