期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 527, 期 9, 页码 2233-2240出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.11.057
关键词
Friction stir welding; 7XXX aluminum; Natural aging; Microstructural evolution
类别
资金
- Boeing Company
The microstructural and mechanical property evolution of friction Stir welded 7050-T7651 and 7075-T651 Al alloys were examined as a function of room temperature (natural) aging for LIP to 67,920 h. During the range of aging times studied, transverse tensile strengths continuously increased, and are still increasing, with improvements of 24% and 29% measured for the 7050-T7651 and 7075-T651 Al alloy friction stir welds, respectively. Microstructural evolution within the weld nugget and heat-affected zone was evaluated with both transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). Formation of a high volume fraction of GP(II) zones produced a majority of the strength improvement within the weld nugget and HAZ regions. The rational for the microstructural changes are discussed in light of the mechanical properties. (C) 2010 Published by Elsevier B.V.
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