期刊
ACTA MATERIALIA
卷 166, 期 -, 页码 587-596出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.12.036
关键词
Aluminium alloy; Orientation relationships; Dispersoid-precipitate aggregate; ACOM-TEM; Scanning precession electron diffraction
资金
- AMPERE project [NFR247783]
- Research Council of Norway
- Hydro
- Granges
- Neuman Aluminium Raufoss (Raufoss Technology)
- Nexans
- Research Council of Norway [NFR221714]
- ERC [291522-3DIMAGE]
- EPSRC [EP/R008779/1]
- EPSRC NanoDTC Cambridge [EP/L015978/1]
- University of Cambridge
- EPSRC [EP/R008779/1] Funding Source: UKRI
T-(Al20Cu2Mn3) phase dispersoids are important for limiting recovery and controlling grain growth in Al-Cu alloys. However, these dispersoids can also reduce precipitation hardening by acting as heterogeneous nucleation sites and may lead to increased susceptibility towards pitting corrosion when galvanically coupled with S-(Al2CuMg) phase precipitates. The interplay between T- and S-phases is therefore important for understanding their effect on the mechanical and electrochemical properties of Al-Cu-Mg alloys. Here, the crystallographic relationships between the T-phase, S-phase, and surrounding Al matrix were investigated in an Al-1.31Cu-1.14Mg-0.13Ag-0.10Fe-0.28Mn (at.%) alloy by combining scanning precession electron diffraction with misorientation analysis in 3-dimensional axis-angle space and high-resolution transmission electron microscopy. Orientation relationships are identified between all three phases, revealing S-T orientation relationships for the first time. Differences in S-Al orientation relationships for precipitates formed at T-phase interfaces compared to their non-interfacial counterparts were also identified. These insights provide a comprehensive assessment of the crystallographic relationships in T-/S-phase aggregates, which may guide future alloy design. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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