摘要
在生产条件下制备Tb0.3Dy0.7Fe2定向凝固合金的新工艺包括：利用真空悬浮熔炼技术为定向凝固提供杂质水平低，成分均匀，一致性好的优质铸造母合金棒；为了保证定向凝固过程的平稳性，发展了二次定向技术和母棒吊挂技术；改进真空热处理条件，在消除非平衡相和残余应力的过程中防止形成液相金属，防止氧化。本文分析了定向棒产生裂纹、疏松和表面孔洞的原因，提出了克服这些缺陷的方法。利用这些技术制备的φ6-80mm的Tb0.3Dy0.7Fe2晶体，它们的λ//（500Oe）达到800-1400×10^-6，而且无明显的冶金缺陷。
The new process technology to produce the directional solidified Tb0.3Dy0.7Fe2 alloy is as follows. Vacuum suspension smelting process is used to cast high-quality base alloy bar with low impurity, even components and high homogeneity for directional solidification. To ensure the stability in directional solidifying process, the secondary directional technology and base bar hanging technique are developed. The conditions for vacuum heat-treatment are improved to avoid liquid phase fore mation and oxidation during the elimination of non-equilibrium phase and residual stress. Analyses the causes of cracking, porosity and surface pores on the directional bar, thus proposing the way to get rid of these defects. The Tb0.30y0.7Fe2 crystalline bars, 6-80mm across have a λ//（500 Oe） up to 800- 1400 × 10^-6 without obvious metallurgical defects.
出处
《真空》
CAS
北大核心
2006年第5期31-35,共5页
Vacuum
关键词
超磁致伸缩合金
真空悬浮熔炼
定向凝固技术
冶金缺陷
giantmagnetostrictive alloy
vacuum suspension smelting
directional solidification technology
metallurgical defects
