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Nano-Sized Cuboid-Shaped Phase in Mg–Nd–Y Alloy and its Behavior During Isothermal Aging
Published online by Cambridge University Press: 30 November 2016
Abstract
In the present study, nano-sized cuboid-shaped particles in Mg–Nd–Y are studied by means of Cs-corrected atomic-scale high-angle annular dark-field scanning transmission electron microscopy. The structure of the cuboid-shaped phase is identified to be yttrium (major component) and neodymium atoms in face-centered cubic arrangement without the participation of Mg. The lattice parameter a=5.15 Å. During isothermal aging at 225°C, Mg3(Nd,Y) precipitates adhere to surface (100) planes of the cuboid-shaped particles with the orientation relationship:
$[100]_{{{\rm Mg}_{{\rm 3}} {\rm RE}}} \,/\,\,/\,[100]_{{{\rm Cuboid}}} $
and
$[310]_{{{\rm Mg}_{{\rm 3}} {\rm RE}}} \,/\,\,/\,[012]_{{{\rm Cuboid}}} $
. The fully coherent interfaces between the precipitates and the cuboid-shaped phases are reconstructed and categorized into two types:
$(400)_{{{\rm Mg}_{{\rm 3}} {\rm RE}}} $
interface and
$(200)_{{{\rm Mg}_{{\rm 3}} {\rm RE}}} $
interface.
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- Materials Applications
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- © Microscopy Society of America 2016
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