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000201771 1001_ $$0P:(DE-HGF)0$$aEhlers, F. J. H.$$b0$$eCorresponding Author
000201771 245__ $$aPhase stabilization principle and precipitate-host lattice influences for Al–Mg–Si–Cu alloy precipitates
000201771 260__ $$aDordrecht [u.a.]$$bSpringer Science + Business Media B.V$$c2014
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000201771 520__ $$aIn this work, we seek to elucidate a common stabilization principle for the metastable and equilibrium phases of the Al–Mg–Si–Cu alloy system, through combined experimental and theoretical studies. We examine the structurally known well-ordered Al–Mg–Si–Cu alloy metastable precipitates along with experimentally observed disordered phases, using high angle annular dark field scanning transmission electron microscopy. A small set of local geometries is found to fully explain all structures. Density functional theory based calculations have been carried out on a larger set of structures, all fully constructed by the same local geometries. The results reveal that experimentally reported and hypothetical Cu-free phases from the set are practically indistinguishable with regard to formation enthalpy and composition. This strongly supports a connection of the geometries with a bulk phase stabilization principle. We relate our findings to the Si network substructure commonly observed in all Mg–Al–Si(–Cu) metastable precipitates, showing how this structure can be regarded as a direct consequence of the local geometries. Further, our proposed phase stabilization principle clearly rests on the importance of metal-Si interactions. Close links to the Al–Mg–Si precipitation sequence are proposed.
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000201771 7001_ $$0P:(DE-HGF)0$$aWenner, S.$$b1
000201771 7001_ $$0P:(DE-HGF)0$$aAndersen, S. J.$$b2
000201771 7001_ $$0P:(DE-HGF)0$$aMarioara, C. D.$$b3
000201771 7001_ $$0P:(DE-HGF)0$$aLefebvre, W.$$b4
000201771 7001_ $$0P:(DE-Juel1)144965$$aBoothroyd, C. B.$$b5$$ufzj
000201771 7001_ $$0P:(DE-HGF)0$$aHolmestad, R.$$b6$$eCorresponding Author
000201771 773__ $$0PERI:(DE-600)2015305-3$$a10.1007/s10853-014-8371-4$$gVol. 49, no. 18, p. 6413 - 6426$$n18$$p6413 - 6426$$tJournal of materials science$$v49$$x1573-4803$$y2014
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