研磨对Fe─29wt％Ni合金超细微粒马氏体转变及比磁化强度的影响

Effect of Grinding on the Martensitic Transformation and the Specific Magnetization of Fe-29wt%Ni Alloy UItrafine Particles

在Ｎ＿２气氛中，用蒸发冷凝法，制备了不同平均粒径（１２～１００ｎｍ）的Ｆｅ－２９ｗｔ％Ｎｉ合金超细微粒样品。它们是马氏体ａ’（ｂｃｃ）和奥氏体γ（ｆｃｃ）的混合体。而且，马氏体体积分数随样品平均粒径减小而明显增加。实验表明，手工研磨，导致马氏体体积分数和比磁化强度显著增大。平均粒径越大，这种影响越大。

The ultrafine particle of Fe-29wt%Nialloy with different average diameters( 12-100nm)are prepared by mea ns of evaporating condensatingmethod in N_2.They are a mixture of the martensiteα’(bcc)and the austensite γ(fcc).Besides,thevolume conte nt of the martensite increase. markedlywith the decrease of the average diameter.Experiment shows that manual grinding causes thevolume content of the martensite to increase and thespecific magnetization to intensify. The larger theaverage diameter of particles,the more obvious theeffect.