Details

Autor(en) / Beteiligte

• Weng, Yaoyao
• Jia, Zhihong
• Ding, Lipeng
• Muraishi, Shinji
• Wu, Xiaozhi
• Liu, Qing

Titel

The multiple orientation relationships and morphology of β' phase in Al-Mg-Si-Cu alloy

Ist Teil von

• Journal of alloys and compounds, 2018-10, Vol.767, p.81-89

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The orientation relationships (ORs), segregation behavior and morphologies of β' 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 β' precipitates, and Cu segregation at the β′/α-Al interface is observed in all these precipitates. The rod-like β' precipitate has multiple β'-angles ranging from 6.1° to 14.1° and non-uniform Cu segregation at the β′/α-Al interface, while the lath-like β' precipitate has a constant β'-angle of 0° 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 β' precipitates, which causes different lattice matching of β′ with α-Al lattice. These findings provide new insights in controlling the precipitation hardening and mechanical properties of this type of alloys. •Six different ORs and two morphologies are revealed for β' precipitates.•The multiple ORs of β' are attributable to the rotation of QP lattice.•Cu segregation is observed at the β′/α-Al interfaces.