淬火析出对Al-Zn-Mg-Cu合金时效行为的影响（英文）

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Bibliographic Details
Published in中国有色金属学报：英文版 Vol. 22; no. 6; pp. 1255 - 1263
Main Author 唐建国 陈慧 张新明 刘胜胆 刘文军 欧阳惠 李红萍
Format Journal Article
LanguageEnglish
Published 2012
Subjects
Al-Zn-Mg-Cu合金
时效
析出
淬火
淬火敏感性
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Bibliography:Al-Zn-Mg-Cu alloy; quenching; quench sensitivity; aging; precipitation
43-1239/TG
The effects of quenching and aging （T6, T7 and RRA） on the microstructural evolution of an A1-Zn-Mg-Cu alloy were investigated by hardness test, optical microscopy （OM）, transmission electron microscopy （TEM） and differential scanning calorimetry （DSC） measurements. It is found that the hardness of T6 aged sample after water-quenching is the highest. The quench sensitivities of T7 and RRA are almost the same, which are 1.2% higher than that of T6. TEM observation shows that the quench sensitivity for the studied alloy is mainly caused by heterogeneous precipitation during slow quenching. Many r/phases precipitate on A13Zr dispersoids inside recrystallized grains and at （sub） grain boundaries, while T and S phases form in the substructure with high density of dislocations and defects. After aging, the η＇ precipitates are coarser in the vicinity of equilibrium r/phase. However, the size and morphology of the precipitates show different characteristics among T6, T7 and RRA treatments. The DSC results are highly consistent with the TEM observation. The DSC curves of T6 aged samples are different from those of T7 and RRA aged samples, which also reflects the differences on the microstructure.
TANG Jian-guo1, CHEN Hui1, ZHANG Xin-ming1, LIU Sheng-dan1, LIU Wen-jun1, OUYANG Hui1, LI Hong-ping2 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. Shanghai Aircraft Design and Research Institute, Shanghai 200232, China
ISSN:1003-6326