摘要
采用低频电磁半连续铸造技术,制备了一种新的超高强高韧10Zn-2.5Mg—2.5Cu—0.15Zr铝合金锭坯,考察了电磁场参数频率和强度对铸态组织的影响。结果表明,低频电磁铸造组织均匀、细小、等轴,呈蔷薇形和球形,平均晶粒尺寸为20——40μm;适当增加电磁场频率和安匝数有利于细小均匀的等轴晶组织的获得;最佳的电磁场参数为:电磁场频率为25—35 Hz,安匝数为12800—16000 AT.相对于常规直接水冷铸造,低频电磁铸造提高铸态拉伸强度极限和延伸率。
Under the low frequency electromagnetic field, a new super-high strength and toughness Al alloy (Al-10Zn-2.5Mg-2.5Cu-0.15Zr) was semi-continuously cast. The effect of electromagnetic frequency and intensity on as-cast microstructures and mechanical properties were investigated. The results show that the microstructures of the alloy cast under low frequency electromagnetic field are fine, uniform and equiaxed, rose-shaped or globular, and average grain size is between 20-40 mum. It is also shown that the proper increase in electromagnetic frequency and intensity is helpful for obtaining fine, uniform and equiaxed as-cast microstructures. The optimum electromagnetic parameters are that frequency is 25-35 Hz and number' of ampere turns is 12800-16000 AT. And the ultimate tensile strength and elongation of low frequency electromagnetic cast billets are greatly increased.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第5期482-485,共4页
Acta Metallurgica Sinica
基金
国家高技术研究发展规划资助项目 2001AA332030
关键词
铝合金
低频电磁铸造
微观组织
晶粒细化
Al alloy
low frequency electromagnetic casting
microstructure
grain refinement
