期刊论文

中文

中国稀土学报

1000-4343

2006

24

5

599-604

10.3321/j.issn:1000-4343.2006.05.016

2005CB623706:国家重点基础研究发展计划（973计划）

本校为其他机构

采用金相显微镜、扫描电子显微镜和透射电子显微镜研究了微量钪对Al-Zn-Mg-Cu-Zr系合金组织的影响,测试了不同热处理状态下合金的力学性能和电导率.结果表明,添加微量Sc可以明显细化合金的铸态晶粒,显著提高Al-Zn-Mg-Cu-Zr合金的力学性能和电导率,其作用机制主要为Al_3(Sc,Zr)引起的细晶强化、亚结构强化和沉淀强化;Al-9.0Zn-2.5Mg-1.2Cu-0.15Zr-0.12Sc和Al-9.5Zn-2.5Mg-1.2Cu-0.15Zr-0.12Sc经强化固溶和T6处理后,抗拉强度分别达到829.4和818.6 MPa.

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 dectric conductivity of the studied alloys under different treatment conditions were tested. The results show that adding minor Sc can greatly fine the grain size of the Al-Zn-Mg-Cu-Zr alloy ingots and obviously improve the tensile properties and electric conductivity of the alloys. The strengthening mechanism is consider...