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《Journal of Beijing Polytechnic University》 2004-04
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Microstructure and Properties of Al-Zn-Mg Alloys Containing RE Er

RUAN Hai-qiong, JIN Tou-nan, YANG Jun-jun, XU Guo-fu, NIE Zuo-ren College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China  
To indicate the microalloy effect of the rare earth element-Er on the alloys which could be strengthened by thermal treatment (precipitation consolidation, by ingot metallurgy six different compositions of Al-Zn-Mg alloys containing rare earth element Er were prepared and studied. The effects of Er on the microstructures and properties of Al-Zn-Mg alloys were studied through hardness test, tensile properties measurement, optical microscopy, X-ray diffraction analysis(XRD), scanning electron microscopy (SEM) and energy spectrum analysis. Experimental results show that the cast microstructures of Al-Zn-Mg alloys can be remarkably refined, and the dentrite structures eliminated, too. When the content of Er is up to w (Er)=0.7%, the dentrite structures of the alloy almost disappear, and the grains become very fine and equably distributed. As for the cool-rolled microstructure and the aged microstructure, the element Er has the same refining effects on them. The tensile strengh σb, and the yield strengh σ0.2 have been increased significantly after adding Er to them, but the elongations decrease a little. When adding Er to the Al-Zn-Mg alloy, element Er reacts with element Al to form the Al3Er phase. The refining of the microstructures and the strengthening of the alloy are relative to the formation and precipitation of the Al3Er phase.
【Fund】: 国家"九七三"计划资助项目(G1999064907).
【CateGory Index】: TG113
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