材料工程2018，Vol.46Issue(4)：82-90,9.DOI:10.11868/j.issn.1001-4381.2017.000277
800MPa级Al-Zn-Mg-Cu系合金
Al-Zn-Mg-Cu Alloys with Strength of 800MPa
摘要
Abstract
This research has produced Al-Zn-Mg-Cu alloy containing 20％ (mass fraction, the same below) alloying elements by the Hot-top semi-continuous DC casting equipment, which has adopted purifying and refining on-line technologies. This alloy has broken the limit of 7000 Al-alloy containing no more than 14％ alloying elements. The microstructure and fracture of the alloy were investigated by optical microscopy (OM), transmission electron microscopy (TEM) and scanning electron microscopy (SEM), the temperature of phases transformation was investigated by differential scanning calorimetry (DSC), and the hardness and tensile properties were also tested. The tensile strength, yield strength and elongation of this alloy can be up to 810. 3, 799. 3MPa and 3. 4％ by RRA heat-treatment after extrusion. Through the study on the single and tertiary-stage ageing treatment kinetics, the optimum ageing temperature 120℃ is identified and a wider range of aging time can be chosen. Moreover, no other precipitates are found in the alloy containing 16. 1％Zn element, and the joint strengthening comes from the undissolved second phase and the ageing precipitation η' phase.关键词
超高强铝合金/DC铸造/RRA热处理/力学性能Key words
ultra-high strength Al alloy/DC casting/RRA heat treatment/mechanical property分类
矿业与冶金引用本文复制引用
杨守杰,邢清源,于海军,王玉灵,戴圣龙..800MPa级Al-Zn-Mg-Cu系合金[J].材料工程,2018,46(4):82-90,9.基金项目
国防基础科研计划资助项目 (JCKY2016205C009) （JCKY2016205C009）
