期刊
SCRIPTA MATERIALIA
卷 188, 期 -, 页码 269-273出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.07.049
关键词
Al-Zn-Mg-Cu; Precipitation; Reversion and re-aging; Grain boundary; Atom probe tomography
类别
资金
- China Scholarship Council
High-strength Al-Zn-Mg-Cu alloys are highly susceptible to stress corrosion cracking (SCC) which severely limits their lifetime. Reversion and re-aging (RRA) temper provides a higher SCC resistance at no loss in strength, yet the microstructural origins of these enhanced properties remain elusive. In an Al-Zn-MgCu alloy, we show that the fine precipitate dispersion in the grain interiors is similar in the peak aged and RRA tempers. However, upon RRA, precipitates inside the grains are enriched in Cu, lowering the Cu matrix content, and reducing the relative difference in the Cu precipitate composition between bulk and grain boundaries. This study enriches the current understanding on the critical role of Cu related to SCC resistance in Al-Zn-Mg-Cu alloys. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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