【摘要】 通过金相、扫描电镜、透射电镜和X射线衍射仪以及拉伸性能和电导率测试,研究Al-9.0Zn-2.5Mg-1.2Cu-0.12Sc-0.15Zr合金的组织性能。研究结果表明:含0.12%Sc的7000系铝合金铸态组织为细小的等轴晶;合金经强化固溶和T6处理后,抗拉强度σb达829.4MPa,伸长率δ为5.7%;合金经一般固溶及RRA处理后,σb为733.4MPa,δ为5.4%,电导率为37.6%。合金强化机理主要为Al3(Sc,Zr)引起的细晶强化、亚结构强化和沉淀强化。更多还原

【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).更多还原