Research on the Microstructure and Properties of High-strength Al-Zn-Mg-Cu-Sc-Zr Alloy Processed by Friction Stir Processing
In this paper,high strength Al-Zn-Mg-Cu-Sc-Zr alloy was prepared by Sc,Zr microalloying,and ultra-fine grains were obtained by friction stir processing(FSP).The effects of FSP on the microstructure and mechanical properties of Al-Zn-Mg-Cu-Sc-Zr were investigated by Optical Microscopy(OM),Scanning Electron Microscope(SEM),Electron Backscatter Diffraction(EBSD)and microhardness measurements.The superplastic deformation behavior of Al-Zn-Mg-Cu-Sc-Zr alloy in the range of 300～450 ℃ and 10 3～10 1 s-1 strain rate was studied.The effect of microalloying and friction stir processing on microstructure and properties of Al-Zn-Mg-Cu-Sc-Zr alloy was analyzed.Al-Zn-Mg-Cu-Sc-Zr alloy has high strength and good plasticity due to the formation of highly stable Al3(Sc,Zr)precipitates and ultrafine grains.The results obtained in this paper can lay a foundation for the development of high strength Al-Zn-Mg-Cu alloy with superplasticity.
aluminum alloymicroalloyingfriction stir processingsuperplasticitymicrostructure and property
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