The Effect of AC Electro-magnetic Body Force on the Solidified Microstructure of Zn-10%Bi Hyper-monotectic Alloy
Monotetic alloy have been researched for hundred years.Recent years,researchers have prepared homogeneous monotectic alloy by electro-magnetic body force(EMBF).But the mechanism of separation and refinement of the second phase in liquid matrix by EMBF is not very clear.This paper investigated the effect of different AC EMBF on the microstructure and solidification process of Zn-10%Bi hyper-monotectic alloy by quenching the samples in water under high static magnetic field.It is shown that,the superimposing of AC EMBF can influence the moving speed of the second phase droplet and damp the gravity segregation in solidifying Zn-10%Bi alloy.When the AC EMBF reaches 5×105N/m3 in different magnetic flux densities from 2 to 10 Tesla,the homogenuous distribution of bismuth particles could be achieved,A physical model is established to illustrate the mechanism of separation and refinement of the second Bi droplets at the stage of liquid-liquid separation by AC EMBF.The results show that the second droplets can be divided into two or three smaller droplets by Lorenz force caused by induced current at the former and later location of bismuth droplet.When the bismuth droplet moves at a proper speed which is adjusted by EMBF,it will be broken down by Lorenz forces.
High magnetic field Hyper-monotectic alloy Segregation EMBF
ZHENG Tian-xiang ZHONG Yun-bo SUN Zong-qian WANG Jiang LEI Zuo-sheng REN Wei-li REN Zhong-ming
Shanghai Key Laboratory of Modern Metallurgy & Material Process,Shanghai University,Shanghai 200072,China
国际会议
The 7th International Conference on Electromagnetic Processing of Materials(第七届冶金与材料电磁过程国际大会)
北京
英文
1-5
2012-10-22（万方平台首次上网日期，不代表论文的发表时间）