期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 53, 期 -, 页码 40-55出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2013.07.002
关键词
Interface; Dislocation; Frank-Bilby; Atomistic simulation
资金
- Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [2008LANL1026]
- LDRD [ER20140450, DR20110029]
Nanolayered metallic composites exhibit unusual high strength at the layer thickness in nanometers. Plastic deformation including nucleation, glide, and transmission of dislocations is strongly related to interface structure and properties. Combining atomistic simulations with the classical Frank-Bilby theory, we studied dislocation structures of semicoherent interfaces between face-centered-cubic (fcc) and body-centered-cubic (bcc) crystals. An atomically informed Frank-Bilby theory is proposed for quantitative analysis of interface dislocations. The results showed that (1) seven sets of interface dislocations are present in the Nishiyama-Wasserman (NW) interface and two sets of interface dislocation in the Kurdjumov-Sachs (KS) interface although they are misoriented by only similar to 5.6 degrees; (2) Burgers vectors of interface dislocations can be well defined in a commensurate/coherent dichromatic pattern (CDP) lattice corresponding to the NW interface and the Rotation CDP (RCDP) lattice corresponding to the KS interface; (3) the CDP and RCDP lattices are not simply a geometric average of the two natural lattices; finally we demonstrated that (4) the nucleation of dislocations, including interface dislocation loops corresponding to interface sliding and lattice dislocation loops corresponding to plastic deformation in crystals, are strongly correlated with interface dislocation patterns. Published by Elsevier Ltd.
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