Preparation and Microstructure Evaluation of Directionally Solidified Nd-Fe-B Ingots by Electromagnetic Cold Crucible

摘要：

　　In this paper Nd-Fe-B ingots with hyper-peritectic composition were prepared through continuous and directional solidification by a novel electromagnetic cold crucible approach.A group of experiments were carried out in order to investigate the effects of input power and withdrawal velocity on the microstructure and growth orientation of Nd-Fe-B phases.It was found that the peritectic Nd2Fe14B phase grows with a planar interface at lower withdrawal velocity and changed into the dendritic interface at higher withdrawal velocity.The result was explained by the theory of constitutional supercooling.Meanwhile the volume fraction of ferromagnetic T1 phase was found to be increased first and then decreased with the increasing of withdrawal velocity during the growth process of the ingots.

关键词： electromagnetic cold crucible directional solidification Nd-Fe-B structure ferromagnetic phase

作者: DING Hong-sheng Feng Kui WANG Yong-zhe CHEN Rui-run GUO Jing-jie

作者单位: National Key Laboratory for Precision Hot Processing of Metals,School of Materials Science and Engineering,Harbin Institute of Technology,Harbin,150001,China

会议类型: 国际会议

会议名称: 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)

会议地点: 北京

会议语种:英文

页码: 1-6

在线出版日期: 2012-10-22（万方平台首次上网日期，不代表论文的发表时间）