|Interaction between a screw dislocation and stacking faults in FCC metals|
|Wei HJ(魏豪杰); Wei YG(魏悦广); Wei, HJ
|Source Publication||MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
|Abstract||The mechanical properties of polycrystalline metals greatly depend on the interaction between lattice dislocation and planar defects, but some details about this interaction still need to be explored. In this paper, we investigated the impingement of a screw dislocation on intrinsic stacking fault (SF) and extrinsic stacking faults (ESF) in different FCC metals by using the molecular dynamics simulations. As a screw dislocation approaches a SF from one side, the response of SF will be one of the results: (1) annihilated;(2) transformed into ESF; (3) penetrated. Also, as a screw dislocation interacts with ESF, the response of ESF will be one of the results: (1) transformed into a three-layer thick twin; (2) into an SF; (3) penetrated. Dimensionless parameters relevant to the planar fault energies and their ratios are used to predict the propensity to different interaction modes. The results reveal the evolution law of internal defects clearly, which will be significant to further understand the details of plastic deformation and to seek the underlying techniques for strengthening metals.|
|Keyword||Molecular Dynamics Simulation
Planar Fault Energy
Coherent Twin Boundaries
|Funding Organization||All of the simulations were performed using Lammps Molecular Dynamics Simulator  and visualized by Atomeye . This work is supported by National Science Foundation of China through Grants Nos. 11021262, 10932011, 90816004 and 91116003;and by National Basic Research Program of China through 2012CB937500.
|Corresponding Author||Wei, HJ|
Wei HJ,Wei YG,Wei, HJ. Interaction between a screw dislocation and stacking faults in FCC metals[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2012,541(4):38-44.
Wei HJ,Wei YG,&Wei, HJ.(2012).Interaction between a screw dislocation and stacking faults in FCC metals.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,541(4),38-44.
Wei HJ,et al."Interaction between a screw dislocation and stacking faults in FCC metals".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 541.4(2012):38-44.
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