Nano-Sized Cuboid-Shaped Phase in Mg-Nd-Y Alloy and its Behavior During Isothermal Aging

作者：Zheng, Jingxu; Luo, Zhongyuan; Tan, Lida; Chen, Bin^*

来源：Microscopy and Microanalysis, 2016, 22(6): 1244-1250.

DOI：10.1017/S1431927616011764

• intermetallic
• nucleation and growth
• heat treatment
• interfaces

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 angstrom. During isothermal aging at 225 degrees C, Mg-3(Nd, Y) precipitates adhere to surface (100) planes of the cuboid-shaped particles with the orientation relationship: [100](Mg3RE) / / [100](Cuboid) and [310](Mg3RE) / / [012](Cuboid). The fully coherent interfaces between the precipitates and the cuboid-shaped phases are reconstructed and categorized into two types: (400)(Mg3RE) interface and (200)(Mg3RE) interface.

• 出版日期2016-12
• 单位上海交通大学