组织和性能
(1. 长沙理工大学 材料科学与工程学院，长沙 410076;
2. 中南大学 材料科学与工程学院，长沙 410083)
摘 要:
关键字: 超高强铝合金；Sc；显微组织；力学性能；电导率
Al-9.0Zn-2.5Mg-1.2Cu-0.12Sc-0.15Zr alloy
（1. School of Materials Science and Engineering, Changsha University of
Science and Technology, Changsha 410076, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The microstructure and properties of Al-9.0Zn-2.5Mg-1.2Cu-0.12Sc-0.15Zr alloy under different treatment conditions were investigated by using optical microscope(OM), scanning electron microscope (SEM), transmission electron microscope(TEM), X-ray diffractometry and measurements of tensile properties and electric conductivity. The results show that the as-cast microstructures of 7 000 series alloys with 0.12%Sc are equiaxed. After strengthening solution and T6 treatment, the tensile strength and elongation of studied alloy are 829.4 MPa and 5.7%, respectively. After solution and RRA, the tensile strength, elongation and electric conductivity of studied alloy are 733.4 MPa, 5.4% and 37.6%, respectively. The strengthening mechanisms are mainly sub-structure strengthening, precipitation strengthening and solution strengthening of Al3(Sc, Zr).
Key words: ultra-high strength Al alloys; Sc; microstructure; mechanical property; electric conductivity
