机械合金化Sm-Fe-B粉末的结构和磁致伸缩

Magnetostriction and Structure of MechanicallyAlloyed SmFeB

通过机械合金化方法对不同成分配比的Ｓｍ－Ｆｅ－Ｂ混合粉末经４０ｈ球磨制备合金。利用Ｘ射线衍射，法拉第磁天平和ＹＪ－２５型静态应变仪研究了Ｓｍ－Ｆｅ－Ｂ合金的结构、磁化强度及磁致伸缩。结果表明：随Ｂ含量的增加，合金中的非晶或微晶组分增多，比磁化强度σ下降，而磁致伸缩｜λ∥－λ⊥｜值增加。其中Ｓｍ３５Ｆｅ５６Ｂ９成分的混合粉末经４０ｈ研磨后在９３０ｋＡ／ｍ磁化场下室温扩λ∥－λ⊥＝－５１０×１０－６。

Different atomic ratio of SmFeB mixed powder was mechanically milled at room temperature for 40hThe structure,magnetization and magnetostriction of SmFeB alloys have been studied by using the Xray diffraction,Faraday magnetic balance and YJ25 type static strain meterIt was found that amorphous or microcrystal component of SmFeB mixed powder increases,while specific magnetization(σ) decreases, with the increase content of boron. The magnetostriction of mechanically alloyed Sm35Fe56B9 reaches λ∥-λ⊥=-510×10-6 at 930kA/m.