摘要
采用电磁细晶铸造技术,降低其频率,半连续铸造一种新的超高强高韧铝合金(10Zn-2.5Mg-2.5Cu-0.15Zr-余量Al),考察了低频电磁铸造与常规DC铸造组织、元素晶内固溶度和力学性能的区别,重点考察了电磁场频率和安匝数对铸锭元素晶内固溶度和力学性能的影响规律。结果表明,相对常规DC铸造,低频电磁铸造组织细小均匀等轴,合金元素Zn,Mg和Cu在晶内的固溶度增加,铸态维氏硬度、延伸率和拉伸强度增加。频率为15～25Hz和安匝数12800～16000AT时,合金元素Zn,Mg和Cu在晶内的固溶度最高,锭坯维氏硬度、延伸率和拉伸强度最大。其12mm的挤压棒材热处理后的拉伸强度极限为780MPa,延伸率大于8%。
A new superhigh strength and toughness Al alloy (10Zn25Mg25Cu015ZrbalanceAl) was semicontinuously cast on the basis of CREM (casting, refining, electromagnetic), by lowering the electromagnetic frequency to 15～35Hz The differences of microstructure, intracrytalline element solubility and mechanical properties between DC and low frequency electromagnetic casting were investigated The effect of electromagnetic frequency and number of ampere turns on intracrytalline element solubility and mechanical properties were focused on The results show that low frequency electromagnetic cast microstructures of 10Zn25Mg25Cu015ZrbalanceAl alloy are well refined, and intracrytalline element (Zn,Mg and Cu) solubility and mechanical properties are greatly increased It also shows that when the optimum frequency is 15～25Hz and number of ampere turns is 12800～16000A, intracrytalline element (Zn,Mg and Cu) solubility are higher, and mechanical properties are the best The billets were extruded into 12mm bars and their tensile ultimate strength are 780MPa and the elongation are greater than 8% after thermal treatment
出处
《航空材料学报》
EI
CAS
CSCD
2003年第1期16-20,共5页
Journal of Aeronautical Materials
基金
十五863"项目(2001AA332030)
关键词
低频电磁铸造
超高强高韧铝合金
固溶度
力学性能
low frequency
electromagnetic casting
solubility
mechanical property
Al-Zn-Mg-Cu-Zr
