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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

Jingxu Zheng ,
Zhongyuan Luo ,
Lida Tan  and
Bin Chen
Jingxu Zheng
Affiliation:
Frontier Research Center for Materials Structure, Shanghai Jiao Tong University, Dongchuan Road No. 800, Shanghai, P.R. China School of Materials Science and Engineering, Shanghai Jiao Tong University, Dongchuan Road No. 800, Shanghai, P.R. China
Zhongyuan Luo
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Dongchuan Road No. 800, Shanghai, P.R. China
Lida Tan
Affiliation:
Department of Physical and Environmental Science, University of Toronto, 1265 Military Trail, Toronto, Canada
Bin Chen*
Affiliation:
Frontier Research Center for Materials Structure, Shanghai Jiao Tong University, Dongchuan Road No. 800, Shanghai, P.R. China School of Materials Science and Engineering, Shanghai Jiao Tong University, Dongchuan Road No. 800, Shanghai, P.R. China
*
*Corresponding author. steelboy@sjtu.edu.cn
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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.

Keywords

intermetallicnucleation and growthheat treatmentinterfaces
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 22 , Issue 6 , December 2016 , pp. 1244 - 1250
Copyright
© Microscopy Society of America 2016 

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