title: Nano-Sized Cuboid-Shaped Phase in Mg-Nd-Y Alloy and its Behavior During Isothermal Aging.
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.
authors.affiliation: 1Frontier Research Center for Materials Structure,Shanghai Jiao Tong University,Dongchuan Road No. 800, Shanghai,P.R. China.
authors.forename: Jingxu
authors.initials: J
authors.lastname: Zheng
authors.affiliation: 2School of Materials Science and Engineering,Shanghai Jiao Tong University,Dongchuan Road No. 800, Shanghai,P.R. China.
authors.forename: Zhongyuan
authors.initials: Z
authors.lastname: Luo
authors.affiliation: 3Department of Physical and Environmental Science,University of Toronto,1265 Military Trail, Toronto,Canada.
authors.forename: Lida
authors.initials: L
authors.lastname: Tan
authors.affiliation: 1Frontier Research Center for Materials Structure,Shanghai Jiao Tong University,Dongchuan Road No. 800, Shanghai,P.R. China.
authors.forename: Bin
authors.initials: B
authors.lastname: Chen
keywords: heat treatment; interfaces; intermetallic; nucleation and growth