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。
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）.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2007年第3期396-401,共6页
The Chinese Journal of Nonferrous Metals
基金
湖南省自然科学基金资助项目(06JJ4111)
关键词
超高强铝合金
SC
显微组织
力学性能
电导率
ultra-high strength Al alloys
Sc
microstructure
mechanical property
electric conductivity
