电子束辐照诱导Al_2Ni_3相的析出(英文)

Al_2Ni_3 PRECIPITATION INDUCED BY ELECTRON BEAM IRRADIATION

用400kV透射电镜观察由N9R及2H马氏体组成的淬火Cu－11．2A1-2．9Ni合金样品时，发现大量弥散相因电子束辐照而析出电子衍射分析证实析出相为Al2Ni3.暗场像体视测量与高分辨显微术研究表明，辐照诱导析出不仅是表面反应．Al2Ni3粒子挥优在晶体缺陷及马氏体界面处析出．延长辐照时间，拆出相长大并粗化．

An as-quenched Cu-11 .2%(wt)%Al-2.9 (wt)%Ni alloy specimen. which consists ofordered N9R and 2H structure martensites, was examined by a 400 kV TEM. Largenumbers of dispersive precipitates in the specimen are induced by the electron beam irradiation, These fine particles are identlfied as AI2Ni3 phase by electron diffraction.The stereoscopic measurement of the dark field TEM images combined with HREMstudy showed that this irradiation induced precipitation is not only a surface reaction.AIzNi3 particles precipitate preferentially at crystalline defects and interfaces of themartensitic matrix. When duration of the electron beam irradiation lengthens. growthand coarsening of the precipitates are also observed.