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The microstructures of Al-Zn-Mg-Cu-Zr alloys with minor Sc were studied by using optical microscope(OM), scanning electron microscope (SEM) and transmission electron microscope(TEM). The tensile mechanical properties and electric conductivity of the studied alloys under different treatment conditions were tested. The results show that adding minor Sc can greatly fines the grain size of the Al-Zn-Mg-Cu-Zr alloy ingots and obviously improves the tensile properties and electric conductivity of the alloys. The strengthening mechanism is considered as fine grain strengthening, sub-structure strengthening and dispersion strengthening by Al_3(Sc, Zr). After strengthening solution and T6, the tensile strength of Al-9.0Zn-2.5Mg-1.2Cu-0.15Zr-0.12Sc and Al-9.5Zn-2.5Mg-1.2Cu-0.15Zr-0.12Sc are 829.4, 818.6 MPa respectively.
The microstructures of Al-Zn-Mg-Cu-Zr alloys with minor Sc were studied by using optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The tensile mechanical properties and electric conductivity of the studied The results show that adding minor Sc can greatly fines the grain size of the Al-Zn-Mg-Cu-Zr alloy ingots and obviously improves the tensile properties and electric conductivity of the alloys. The strengthening mechanism After strengthening solution and T6, the tensile strength of Al-9.0Zn-2.5Mg-1.2Cu-0.15Zr-0.12Sc and Al -9.5Zn-2.5Mg-1.2Cu-0.15Zr-0.12Sc are 829.4, 818.6 MPa respectively.