Simulation of the effect of strengthening-phase particles on the plastic deformation of a two-dimensional polycrystal

被引:7
作者
Baimova, Yu A. [1 ]
Dmitriev, S. V. [1 ]
Nazarov, A. A. [1 ]
机构
[1] Russian Acad Sci, Inst Problems Met Superplast, Ufa 450001, Bashkortostan, Russia
关键词
polycrystal; nanomaterial; plastic deformation; grain boundary sliding; simulation; molecular dynamics; strengthening particles; MG-SC ALLOY; 2ND-PHASE PARTICLES; DISLOCATION GLIDE; GRAIN-GROWTH; MICROSTRUCTURE; PRECIPITATION; REFINEMENT; COPPER;
D O I
10.1134/S0031918X12030027
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The method of molecular dynamics was used to investigate the effect of strengthening-phase particles on the process of plastic deformation in two-dimensional nanocrystalline material at given temperature, hydrostatic pressure, and the maximum shear stress. We consider the deformation of a single-phase nanocrystal (material 1); a nanocrystal with particles located at grain boundaries and triple junctions and having atoms whose size is 10% larger than that of the matrix atoms (material 2), 10% less than the size of the matrix atoms (material 3), and is equal to it (material 4). The rate of creep for materials 1 and 2 was approximately the same, but the deformation mechanisms were different. The lowest creep rate was obtained for material 4. It has been shown that in the presence of second-phase inclusions, despite the small grain size, a significant contribution to the material deformation comes from the motion of dislocations, especially in the case of material 2 with incoherent particles. The understanding of the deformation processes developed using model polycrystals can be used for elucidating the precipitation-hardening mechanisms of alloys and the structure evolution of such materials during plastic deformation.
引用
收藏
页码:302 / 311
页数:10
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