Ovsyannikov A. Peculiarities of plastic deformation and fracture of transition b.c.c. metals on nanoscale

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0407U001055

Thesis Registration Form

0407U001055.pdf

Applicant for

Specialization

  • 01.04.13 - Фізика металів

27-12-2006

Specialized Academic Board

Д26.168.01

Essay

Computer simulation findings on deformation and fracture of Mo and Fe nanocrystals are presented in this work. Lattice rearrangements and strain-stress regularities are analyzed. It is found that at uniaxial tension transition from elastic to plastic deformations is related to the nucleation of shear defects as a result of exposure of local shear stresses. The effect of temperature on the yield stress is investigated. Physical model that describes obtained regularities is formulated. Simulation of triaxial uniform tension of ball-like nanocrystals of Mo and Fe is executed. It is exhibited that plastic deformation precedes fracture over the wide range of temperatures.

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