(东北大学 材料电磁过程研究教育部重点实验室， 沈阳 110004)
摘 要: 研究了低频电磁半连续铸造7A60合金铸锭的合金元素在晶内的固溶状况和力学性能。 结果表明： 适当降低电磁场频率和增强电磁场强度， 有利于提高合金元素Zn、 Mg和Cu在晶内的固溶度、 锭坯的维氏硬度、 抗拉强度和延伸率。 频率为15Hz， 安匝数为20kA·turn时， Zn、 Mg和Cu元素相对溶质固溶百分数最高， 分别为68.8%、 76.0%和45.0％； 频率为15Hz， 安匝数为20kA·turn时， 锭坯维氏硬度最高为Hv160； 频率为25Hz， 安匝数为20kA·turn时， 抗拉强度最高为324MPa。
关键字: 低频; 电磁铸造; 元素晶内固溶度; Al-Zn-Mg-Cu-Zr
（The Key Lab of Electromagnetic Processing of Materials of Ministry of Education, Northeastern University,
Shenyang 110004， China）
Abstract: The intracrytalline solubility of alloy elements and mechanical properties of 7A60 Al alloy billets cast by low frequency electromagnetic casting were investigated. The results show that the relative intracrytalline solubility of alloy elements(Zn, Mg and Cu) and mechanical properties, Vicker hardness, ultimate tensile strength and elongation are increased with decreasing electromagnetic frequency and increasing electromagnetic intensity. When the frequency is 15Hz and number of ampere turns is 20kA·turn, relative intracrytalline solubility of alloy elements (for Zn, Mg and Cu the solubility are 68.8%, 76.0% and 45.0％, respectively) is the highest; when the frequency is 15Hz and number of ampere turns is 20kA·turn, Vicker hardness is the highest of Hv160; when the frequency is 25Hz and number of ampere turns is 20kA·turn, ultimate tensile strength is the highest of 324MPa.
Key words: low frequency; electromagnetic casting; intracrytalline solubility of alloy element; Al-Zn-Mg-Cu-Zr
