Preparation and mechanism study of bulk pure rare-earth metals with amorphous and nanocrystalline structures  

作　　者：LI ErDong SONG XiaoYan ZHANG JiuXing LU NianDuan 

机构地区：[1]College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education, BeijingUniversity of Technology, Beijing 100022, China

出　　处：《Chinese Science Bulletin》2007年第3期418-422,共5页

基　　金：the National Natural Science Foundation of China (Grant No. 50401001);the Research Fund for the Doctoral Program of Higher Education (Grant No. 20050005011);the Key Project of Science & Technology Innovation Engi-neering, the Chinese Ministry of Education (Grant No. 705004)

摘　　要：The preparation and the mechanism study of bulk pure rare-earth metals with amorphous and nanocrystalline structures, which were produced by spark plasma sintering (SPS), were carried out in this paper. With different processing parameters, the amorphous, two phases of amorphous and nanocrystalline, and complete nanocrystalline microstructures have been obtained. The nano-grain sizes in the bulk nanocrystalline materials are found smaller than the original powder particles sizes, which may change the conventional viewpoint that the grains in the sintered bulk are generally coarser than the raw powder particles. The technique developed in the present work can be extended to the preparation of many other nano bulk metal materials, and thus enables the studies of the nano-size effects on the physical, chemical and mechanical properties of bulk nano materials.The preparation and the mechanism study of bulk pure rare-earth metals with amorphous and nanocrystalline structures, which were produced by spark plasma sintering （SPS）, were carried out in this paper. With different processing parameters, the amorphous, two phases of amorphous and nanocrystalline, and complete nanocrystalline microstructures have been obtained. The nano-grain sizes in the bulk nanocrystalline materials are found smaller than the original powder particles sizes, which may change the conventional viewpoint that the grains in the sintered bulk are generally coarser than the raw powder particles. The technique developed in the present work can be extended to the preparation of many other nano bulk metal materials, and thus enables the studies of the nano-size effects on the physical, chemical and mechanical properties of bulk nano materials.

关 键 词：块状 稀土金属 非晶态结构 纳米晶结构 火花等离子体烧结 制备 机制 纳米材料 

分 类 号：TB383[一般工业技术—材料科学与工程] TG146.45[金属学及工艺—金属材料]