期刊
MATERIALS CHARACTERIZATION
卷 185, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2021.111675
关键词
Aluminium alloys; Transmission electron microscopy (TEM); Natural ageing; 4D-STEM; Phase mapping; GP-zones
类别
资金
- NTNU Digital Transformation ini-tiative'Alldesign'
- Research Council of Norway (NFR) through the project'SumAl' - Hydro [NFR: 294933]
- Benteler Automotive Rau-foss AS
- Neuman Aluminium
A new methodology has been developed to study the fine details of GP zones in age-hardenable aluminium alloys. It combines high-resolution imaging with electron diffraction and simulations. The stability of the atomic models developed based on the experimental results was verified.
A new methodology has been developed to study the fine details of GP zones in age-hardenable aluminium alloys. It is complementary to atomic resolution high-angle annular dark-field scanning transmission electron microscopy imaging, and combines scanning precession electron diffraction with diffraction simulations. To evaluate the method, data was collected from an Al-Zn-Mg alloy in a condition with a dense distribution of GPI zones. Diffraction patterns were recorded in the 001Al orientation, capturing GPI zones in three projections: along the unique [001]GPI axis, and along the two other mutually orthogonal orientations. The GPI zones viewed along [001]GPI revealed how the truncated octahedron units of the GPI zones were connected in multi-unit GP zones, while the two orientations normal to [001]GPI highlight the internal structure. The stability of the atomic models developed based on the experimental results was verified by density functional theory calculations.
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