机械合金化 Sm-Fe-B 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，Ｆａｒａｄａｙ磁天平和ＹＪ２５型静态应变仪研究了ＳｍＦｅＢ合金的结构，磁化强度和磁致伸缩．结果表明，随Ｂ含量的增加，合金中的非晶及微晶组分增加，比磁化强度σ下降，磁致伸缩｜λ∥－λ⊥｜值增多．其中Ｓｍ３５Ｆｅ５６Ｂ９成分的混合粉末经４０ｈ球磨后，室温下在９３０ｋＡ·ｍ－１磁化场时（λ∥－λ⊥）＝－５１０×１０－６．

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