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@ARTICLE{Ehlers:201771,
author = {Ehlers, F. J. H. and Wenner, S. and Andersen, S. J. and
Marioara, C. D. and Lefebvre, W. and Boothroyd, C. B. and
Holmestad, R.},
title = {{P}hase stabilization principle and precipitate-host
lattice influences for {A}l–{M}g–{S}i–{C}u alloy
precipitates},
journal = {Journal of materials science},
volume = {49},
number = {18},
issn = {1573-4803},
address = {Dordrecht [u.a.]},
publisher = {Springer Science + Business Media B.V},
reportid = {FZJ-2015-04065},
pages = {6413 - 6426},
year = {2014},
abstract = {In this work, we seek to elucidate a common stabilization
principle for the metastable and equilibrium phases of the
Al–Mg–Si–Cu alloy system, through combined
experimental and theoretical studies. We examine the
structurally known well-ordered Al–Mg–Si–Cu alloy
metastable precipitates along with experimentally observed
disordered phases, using high angle annular dark field
scanning transmission electron microscopy. A small set of
local geometries is found to fully explain all structures.
Density functional theory based calculations have been
carried out on a larger set of structures, all fully
constructed by the same local geometries. The results reveal
that experimentally reported and hypothetical Cu-free phases
from the set are practically indistinguishable with regard
to formation enthalpy and composition. This strongly
supports a connection of the geometries with a bulk phase
stabilization principle. We relate our findings to the Si
network substructure commonly observed in all
Mg–Al–Si(–Cu) metastable precipitates, showing how
this structure can be regarded as a direct consequence of
the local geometries. Further, our proposed phase
stabilization principle clearly rests on the importance of
metal-Si interactions. Close links to the Al–Mg–Si
precipitation sequence are proposed.},
cin = {PGI-5},
ddc = {670},
cid = {I:(DE-Juel1)PGI-5-20110106},
pnm = {42G - Peter Grünberg-Centre (PG-C) (POF2-42G41)},
pid = {G:(DE-HGF)POF2-42G41},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000338348000026},
doi = {10.1007/s10853-014-8371-4},
url = {https://juser.fz-juelich.de/record/201771},
}