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Title
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The multiple orientation relationships and morphology of beta phase in Al-Mg-Si-Cu alloy
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Author
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Abstract
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| The orientation relationships (ORs), segregation behavior and morphologies of beta precipitate in an over aged Al-Mg-Si-Cu alloy are systematically characterized by atomic resolution high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). Six different ORs and two morphologies, i.e. rod-and lath-like are revealed for beta precipitates, and Cu segregation at the (beta/alpha-Al interface is observed in all these precipitates. The rod-like beta precipitate has multiple beta-angles ranging from 6.1 to 14.1 degrees and non-uniform Cu segregation at the (beta/alpha-Al interface, while the lath-like beta precipitate has a constant beta-angle of 0 degrees and a periodic Cu segregation. These different ORs are explained to be attributable to the rotation of QP lattice, a near-hexagonal network of Si columns formed within beta precipitates, which causes different lattice matching of beta with alpha-Al lattice. These findings provide new insights in controlling the precipitation hardening and mechanical properties of this type of alloys. (C) 2018 Elsevier B.V. All rights reserved. |
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Language
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English
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Source (journal)
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Journal of alloys and compounds. - Amsterdam
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Publication
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Amsterdam
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2018
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ISSN
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0925-8388
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Volume/pages
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767
(2018)
, p. 81-89
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ISI
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000446316500011
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Full text (Publisher's DOI)
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Full text (open access)
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