Atomic simulation on evolution of nano-crystallizaion in amorphous metals  

作　　者：王宇 王秀喜 王海龙 

机构地区：[1]Key Laboratory of Mechanical Behavior and Design of Materials,Chinese Academy of Sciences,University of Science and Technology of China,Hefei 230026,China

出　　处：《中国有色金属学会会刊：英文版》2006年第B01期327-331,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(10502047) supported by the National Natural Science Foundation of China; Project (2005038166) supported by China Postdoctoral Science Foundation

摘　　要：The deformation-induced nano-crystallization behavior of amorphous pure Ni was investigated by using a molecular dynamics simulation. The microevolution mechanism of the nano-crystallization, the crystallization process in the multicomponent amorphous Ni-Pd alloys and the temperature effect on the nano-crystallization behavior in amorphous metals were studied. The results show that the small nano-crystalline grain will nucleate and grow during the compression deformation. The deformation induces the growth of the ordered clusters in the amorphous metals and the nano-crystalline grain grows under the shearing combination and shearing deposition. The nano-crystalline grain will nucleate in a lower strain under a higher temperature. The combining severe plastic deformation with thermal annealing treatments presents a new opportunity for developing bulk nano-crystalline materials with controlled microstructures.The deformation-induced nano-crystallization behavior of amorphous pure Ni was investigated by using a molecular dynamics simulation. The microevolution mechanism of the nano-crystallization, the crystallization process in the multicomponent amorphous Ni-Pd alloys and the temperature effect on the nano-crystallization behavior in amorphous metals were studied. The results show that the small nano-crystalline grain will nucleate and grow during the compression deformation. The deformation induces the growth of the ordered clusters in the amorphous metals and the nano-crystalline grain grows under the shearing combination and sheafing deposition. The nano-crystalline grain will nucleate in a lower strain under a higher temperature. The combining severe plastic deformation with thermal annealing treatments presents a new opportunity for developing bulk nano-crystalline materials with controlled microstructures.

关 键 词：纳米晶 非晶态金属 结晶 原子模型 

分 类 号：TB383.1[一般工业技术—材料科学与工程]