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Influence of the main alloy elements on the microstructures of as-cast and homogenization treated state of 7000 series aluminum alloys

LIU Ping,CHEN Jiang-hua,LIU Ji-zi,YANG Xiu-bo,QIN Fang,CHEN Yong(Center for High-Resolution Electron Microscopy,College of Materials Science and Engineering, Hunan University,Changsha Hunan 410082,China)  
The effects of the main alloy elements on the microstructures of as-cast and homogenization treated state of 7000 series aluminum alloys were investigated using optical microscopy(OM),scanning electron microscopy(SEM) combined with energy dispersive spectrometry(EDS).The results show that severe dendritic segregation exists in as-cast alloys including Cu,while dendritic segregation is not found in as-cast alloys without Cu.In alloys with Cu and Zn/Mg1.5,η phase(MgZn2) is the main second phase,and η particles are discontinuously distributed at the grain boundaries or interdendritic boundaries.They dissolve back to the matrix during homogenization treatment.However,if Zn/Mg1.5,S phase(Al2CuMg) is the main second phase,and S particles are continuously distributed at the grain boundaries or interdendritic boundaries.They hardly dissolve back to the matrix during homogenization treatment.As for alloys of Cu free,the main constituent is Al5Mg11Zn4.Besides these second phases,there are always a small amount of impurity phases such as Al3Fe or Al7Cu2Fe remained in alloys after homogenization.Through systematic analysis,a diagram illustrating the relationship between alloy composition and second phases was given out.
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