Mechanism of Plastic Collapse of Nanosized Crystals with BCC Lattice under Uniaxial Compression

2018 ◽  
Vol 60 (6) ◽  
pp. 1244-1249
Author(s):  
G. A. Malygin
Keyword(s):  
Uniaxial Compression ◽  
Plastic Collapse ◽  
Bcc Lattice ◽  
Nanosized Crystals

scholarly journals Механизм пластического коллапса наноразмерных кристаллов с ОЦК-решеткой при одноосном сжатии

2018 ◽  
Vol 60 (6) ◽  
pp. 1232
Author(s):  
Г.А. Малыгин
Keyword(s):  
Plastic Deformation ◽  
Plastic Collapse ◽  
Dislocation Source ◽  
Ultrahigh Strength ◽  
Bcc Lattice ◽  
Multiplication Process ◽  
Initial Stage ◽  
Elastic And Plastic Deformation ◽  
Constant Deformation ◽  
Nonlinear Kinetic

AbstractWithin the dislocation–kinetic approach, based on the nonlinear kinetic equation for dislocation density, an attempt is made to consider the problem of a catastrophic plastic collapse of defect-free nanocrystals of metals with bcc lattice under their uniaxial compression with a constant deformation rate. Solutions of this equation were found in the form of moving waves, describing the dislocation multiplication process as the wave moves along the crystal from a local dislocation source. Comparison of the theory with the results of experiments on defect-free Mo nanocrystals showed that their ultrahigh strength at the initial stage of deformation is associated with a low rate of rise of crystal plastic deformation in comparison with the growth of its elastic component. The subsequent plastic collapse of crystal is caused by a sharp increasing the plastic component, ending with reaching the equality of elastic and plastic deformation rates.

Features of defect nucleation in nanosized crystals with BCC lattice

2019 ◽  
Author(s):  
Konstantin Zolnikov ◽  
Dmitrij Kryzhevich ◽  
Aleksandr Korchuganov
Keyword(s):  
Bcc Lattice ◽  
Defect Nucleation ◽  
Nanosized Crystals

MECHANICAL RELAXATION OF SUBSTITUTIONAL-INTERSTITIAL (TETRAHEDRAL) ATOM COMPLEXES IN THE bcc LATTICE

1981 ◽  
Vol 42 (C5) ◽  
pp. C5-787-C5-792 ◽  
Author(s):  
M. Koiwa ◽  
S. Ishioka ◽  
G. Cannelli ◽  
R. Cantelli
Keyword(s):  
Mechanical Relaxation ◽  
Bcc Lattice

Atomistic simulation of the uniaxial compression of black phosphorene nanotubes

2018 ◽  
Author(s):  
Van-Trang Nguyen ◽  
Minh-Quy Le
Keyword(s):  
Finite Element Method ◽  
Molecular Dynamics ◽  
Finite Element ◽  
Uniaxial Compression ◽  
Critical Stress ◽  
Atomistic Simulation ◽  
Critical Strain ◽  
Bond Breaking ◽  
Black Phosphorene ◽  
Weber Potential

We study through molecular dynamics finite element method with Stillinger-Weber potential the uniaxial compression of (0, 24) armchair and (31, 0) zigzag black phosphorene nanotubes with approximately equal diameters. Young's modulus, critical stress and critical strain are estimated with various tube lengths. It is found that under uniaxial compression the (0, 24) armchair black phosphorene nanotube buckles, whereas the failure of the (31, 0) zigzag one is caused by local bond breaking near the boundary.

Sign in / Sign up

Export Citation Format

Share Document