S.J. Yan
金属学报(英文版)
A practical technique to prepare transmission electron microscopy (TEM) thin foil containing powder particle was described and the data for the codeposition of two type particles with copper in the electroplating were presented. By depositing the particles which were distributed in CuSO4 electrolyte on cathode together with Cu2+ in electrodeposition bath, composite coating with suitable thickness could be formed. The thin coating was separated from the substrate and cut into a disc with diameter of 3mm for electropolishing. When the Cu matrix was thinned during electropolishing, the particles contained in the coating plate were also thinned to meet the suitable thickness for TEM observation. Various experimental results revealed that during electrodepositing the current density, pH-value of electrolyte and stirring mode all have significant effects on the distribution of particles in composite coating and the surface quality of the composite coating. The proper parameters used during electrodepositing to prepare TEM thin foil containing powder particle were discussed.
关键词:
electrodeposition
,
Powder
,
particles
,
TEM
,
t
李萍
,
王晓溪
,
薛克敏
,
张翔
,
王雪
中国有色金属学报
对纯铝粉末材料进行200℃单道次等径角挤扭(ECAPT)变形实验研究。采用光学显微镜(OM)、电子背散射技术(EBSD)和透射电子显微镜(TEM)观察和分析变形组织微观结构的变化规律，获得有关晶粒形貌、晶粒尺寸以及晶粒取向分布的信息。结果表明：ECAPT工艺对粉末材料具有强烈的致密和细化效果，1道次ECAPT变形后组织接近完全致密，晶粒细化效果明显，平均晶粒尺寸约为5.2μm；晶粒尺寸分布不均匀，亚晶界和小角度晶界所占比例较高；变形组织内部形成了明显的择优取向，沿剪切方向均匀对称分布，以剪切织构类型为主；200℃条件下，纯铝粉末材料单道次 ECAPT 变形过程中，晶粒的显著细化主要得益于材料组织所承受的剧烈剪切变形和内部所累积的大量有效应变。
关键词:
粉末材料
,
纯铝粉末
,
等径角挤扭
,
微观结构
,
致密
,
晶粒细化
