Atomic simulation on evolution of nano-crystallizaion in amorphous metals
(1.中国科学技术大学 近代力学系 中国科学院力学行为和材料设计开放实验室，合肥 2300272.Key Laboratory of Mechanical Behavior and Design of Materials, Chinese Academy of Sciences,University of Science and Technology of China, Hefei 230026, China)
Abstract: 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.
Key words: atomic simulation; evolution; nano-crystallization; amorphous metals