Journal
MATERIALS CHARACTERIZATION
Volume 99, Issue -, Pages 277-286Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2014.11.028
Keywords
Electron microscopy; Aluminum alloys; Al-Zn-Mg-Cu alloys; Precipitation; Aging; Phase transformation
Categories
Funding
- National Basic Research (973) Program of China [2009CB623704]
- National Natural Science Foundation of China [51301064, 51371081, 51171063]
- Instrumental Innovation Foundation of Hunan Province [2011TT1003]
- Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- China Scholarship Council
- Beijing National Center for Electron Microscopy at Tsinghua University
- Center of Electron Microscopy at Zhejiang University
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Although they are among the most important precipitation-hardened materials for industry applications, the high-strength AlZnMg(Cu) alloys have thus far not yet been understood adequately about their underlying precipitation scenarios in relation with the properties. This is partly due to the fact that the structures of a number of different precipitates involved in electron microscopy in association with quantitative image simulations have to be employed; a systematic study of these hardening precipitates in different alloys is also necessary. In Part I of the present study, it is shown that there are five types of structurally different precipitates including the equilibrium eta-phase precipitate. Using two state-of-the-art atomic-resolution imaging techniques in electron microscopy in association with quantitative image simulations, we have determined and clarified all the unknown precipitate structures. It is demonstrated that atomic-resolution imaging can directly suggest approximate structure models, whereas quantitative image analysis can refine the structure details that are much smaller than the resolution of the microscope. This combination is crucially important for solving the difficult structure problems of the strengthening precipitates in AlZnMg(Cu) alloys. (C) 2015 Elsevier Inc. All rights reserved.
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