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Atom probe tomography study of the nanoscale heterostructure around an Al20Mn3Cu2 dispersoid in aluminum alloy 2024

journal contribution
posted on 01.01.2014, 00:00 authored by Reza Parvizi, Ross MarceauRoss Marceau, A E Hughes, Mike Yongjun TanMike Yongjun Tan, Maria ForsythMaria Forsyth
Atom probe tomography (APT) has been used to investigate the surface and sub-surface microstructures of aluminum alloy 2024 (AA2024) in the T3 condition (solution heat treated, cold worked, and naturally aged to a substantially stable condition). This study revealed surface Cu enrichment on the alloy matrix, local chemical structure around a dispersoid Al20Mn3Cu2 particle including a Cu-rich particle and S-phase particle on its external surface. Moreover, there was a significant level of hydrogen within the dispersoid, indicating that it is a hydrogen sink. These observations of the nanoscale structure around the dispersoid particle have considerable implications for understanding both corrosion and hydrogen embrittlement in high-strength aluminum alloys.

History

Journal

Langmuir

Volume

30

Issue

49

Pagination

14817 - 14823

Publisher

American Chemical Society

Location

Washington, D.C.

ISSN

1520-5827

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2014, American Chemical Society