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Atomic‐Scale Insight into Structure and Interface of Al 2 Y Phase in an Mg–Al–Y Alloy
Author(s) -
Peng Z. Z.,
Shao X. H.,
Guo X. W.,
Wang J.,
Wang Y. J.,
Ma X. L.
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201701015
Subject(s) - materials science , lamellar structure , y alloy , alloy , atomic units , transmission electron microscopy , lamella (surface anatomy) , crystallography , scanning transmission electron microscopy , lattice (music) , grain boundary , stacking , density functional theory , phase (matter) , magnesium alloy , nanoscopic scale , condensed matter physics , microstructure , metallurgy , nanotechnology , composite material , physics , nuclear magnetic resonance , chemistry , computational chemistry , 6111 aluminium alloy , quantum mechanics , acoustics
Atomic‐scale structure of Al 2 Y phase and its interface with magnesium matrix in an Mg–1Al–6.2Y (wt%) alloy have been investigated using scanning transmission electron microscopy (STEM) and density‐functional theory (DFT). Apart from micro‐sized Al 2 Y particles in the interior of grains or along grain boundaries, nano‐sized Al 2 Y lamella with a large aspect ratio precipitates within the grains. Y − enriched stacking faults are introduced at the lamellar Al 2 Y/Mg interface due to 0.07% lattice misfit between (022) Al2Y and( 0 1 ¯ 10 )Mg planes. The first‐principles simulation clarifies that Al 2 Y/Mg interface is energetically occupied by Al atoms other than Y atoms.