期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 764, 期 -, 页码 62-72出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.06.046
关键词
Atom probe tomography; Omega Phase; Al-Cu-Mg-Ag alloy; Preaging
资金
- National Natural Science Funds for Young Scientists of China [51704334]
- National Key Research and Development Program of China [2016YFB0300901]
- Scientific Research Fund of Central South University [502044002]
It is well known that deformation prior to artificial aging considerably decreases the strength properties of Al-Cu-Mg-Ag alloys by suppressing the formation of the main strengthening Omega precipitates. This negative effect is the as-yet unresolved obstacle for the wide applications of Al-Cu-Mg-Ag alloys. In this work, preaging prior to deformation is conducted to evaluate its possible influence on improving the typical microstructure and strength of deformed Al-Cu-Mg-Ag alloy. Quantitative transmission electron microscopy (TEM) and atom probe tomography (APT) analysis of the initial solute clustering and subsequent Omega precipitation of the deformed alloy with and without preaging indicate that preaging ensures strong Mg-Ag co-clustering and hence benefits the dense precipitation of Omega phase in deformed Al-Cu-Mg-Ag alloy. Naturally, the strength of 1% stretched Al-Cu-Mg-Ag alloy is obviously enhanced by preaging. (C) 2018 Elsevier B.V. All rights reserved.
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