(東北大學(xué) 材料電磁過程研究教育部重點(diǎn)實驗室， 沈陽 110004)
摘 要: 研究了低頻電磁半連續(xù)鑄造7A60合金鑄錠的合金元素在晶內(nèi)的固溶狀況和力學(xué)性能。 結(jié)果表明： 適當(dāng)降低電磁場頻率和增強(qiáng)電磁場強(qiáng)度， 有利于提高合金元素Zn、 Mg和Cu在晶內(nèi)的固溶度、 錠坯的維氏硬度、 抗拉強(qiáng)度和延伸率。 頻率為15Hz， 安匝數(shù)為20kA·turn時， Zn、 Mg和Cu元素相對溶質(zhì)固溶百分?jǐn)?shù)最高， 分別為68.8%、 76.0%和45.0％； 頻率為15Hz， 安匝數(shù)為20kA·turn時， 錠坯維氏硬度最高為Hv160； 頻率為25Hz， 安匝數(shù)為20kA·turn時， 抗拉強(qiáng)度最高為324MPa。
關(guān)鍵字: 低頻; 電磁鑄造; 元素晶內(nèi)固溶度; Al-Zn-Mg-Cu-Zr
BAO Wei-ping， CUI Jian-zhong
（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
