低频电磁铸造超高强高韧铝合金元素晶内固溶度和力学性能研究  

Intracrytalline element solubility and mechanical property of a new super-high strength and toughness Al alloy cast under low frequency electromagnetic field

作　　者：董杰[1] 崔建忠[1] 赵志浩[1] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110004

出　　处：《航空材料学报》2003年第1期16-20,共5页Journal of Aeronautical Materials

基　　金：十五863"项目(2001AA332030)

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 superhigh strength and toughness Al alloy (10Zn25Mg25Cu015ZrbalanceAl) was semicontinuously 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 10Zn25Mg25Cu015ZrbalanceAl 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

关 键 词：低频电磁铸造 超高强高韧铝合金 固溶度 力学性能 

分 类 号：TG27[金属学及工艺—铸造]