Influence of 1.0 wt% Li on Precipitates in AI-Zn-Mg-Cu Alloy

Microstructure control always plays a key role in enhancing properties of high-strength AI alloys. Attempts to improve the micro-structure of 7000 series alloys by addition of 1.0 wt% Li have been made for a long time, but unsystematically. This article compares the microstructural features of 1.0 wt% Li-containing AI-Zn-Mg-Cu alloy with those of Li-free Al-Zn-Mg-Cu alloy by using differential scanning calorimetric (DSC) techniques, Vickers microhardness and transmission electron microscopy (TEM). The results show the dominance of Guinier Preston (GP) zones, η' or η phases in 1.0 wt% Li-coutaining Al-Zn-Mg-Cu alloy, and confirm the capability of Li to retard the rate of precipitates growth and coarsening.

作 者： Wei Fang Li Jinshan Hu Rui Kou Hongchao   作者單位： Wei Fang(State Key Laboratory of Solidification Processing, Northwestern Polytechnieal University, Xi'an 710072, China;Beijing Xinghang Mechanical-electrical Equipment Factory, Beijing 100074, China)

Li Jinshan,Hu Rui,Kou Hongchao(State Key Laboratory of Solidification Processing, Northwestern Polytechnieal University, Xi'an 710072, China) 

刊 名： 中國(guó)航空學(xué)報(bào)（英文版）  ISTIC 英文刊名： CHINESE JOURNAL OF AERONAUTICS  年，卷(期)： 2008 21(6)  分類號(hào)： V2  關(guān)鍵詞： AI-Zn-Mg-Cu-Li   alloys   precipitates   DSC   TEM   microhardness  

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