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HomeMaterials Science ForumMaterials Science Forum Vol. 877Directionality and Column Arrangement Principles...

Directionality and Column Arrangement Principles of Precipitates in Al-Mg-Si-(Cu) and Al-Mg-Cu Linked to Line Defect in Al

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Abstract:

In the structures of all metastable precipitates in Al-Mg-Cu and Al-Mg-Si alloys, we find that column surrounding of an element column in the needle/lath direction order according to simple principles. Advanced transmission electron microscopy and DFT calculations support the principles originate with a line defect, which is a segment of a <100>Al column shifted to interstitial positions. We propose the defect aids solute decomposition by partitioning the FCC matrix locally into columns of fewer and higher number of nearest neighbours, which suit smaller and larger size solute atoms, respectively. The defect explains how <100> directionality of the precipitates can arise in a cluster. Ordering of a few defects leads naturally to GPB zones in Al-Mg-Cu and to β'' in Al-Mg-Si.

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The 15th International Conference on Aluminium Alloys

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Materials Science Forum (Volume 877)

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461-470

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.877.461

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Online since:

November 2016

Authors:

Sigmund J. Andersen*, Calin D. Marioara, Jesper Friis, R. Bjørge, Qiang Du, I.G. Ringdalen, Sigurd Wenner, Eva A. Mørtsell, Randi Holmestad, T. Saito, Jostein Røyset, Oddvin Reiso

Keywords:

Al-Mg-Cu Precipitate Structure, Al-Mg-Si, Column Arrangement Principles, DFT, Growth Direction, Line Defect, Nucleation, Solute Decomposition Mechanism, Solute Ordering

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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