Research output: Contribution to journal › Article › peer-review
COLLECTIVE MIGRATION OF LOW-ANGLE TILT BOUNDARIES IN NANOCRYSTALLINE METALS UNDER FATIGUE LOADING. / Konakov, Ya. V.; Ovid'ko, I. A.; Sheinerman, A. G.; Skiba, N. V.
In: Reviews on Advanced Materials Science, Vol. 52, No. 1-2, 2017, p. 113-120.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - COLLECTIVE MIGRATION OF LOW-ANGLE TILT BOUNDARIES IN NANOCRYSTALLINE METALS UNDER FATIGUE LOADING
AU - Konakov, Ya. V.
AU - Ovid'ko, I. A.
AU - Sheinerman, A. G.
AU - Skiba, N. V.
PY - 2017
Y1 - 2017
N2 - A model is suggested that describes collective migration of two neighboring low-angle tilt boundaries in nanocrystalline metals under fatigue loading. Within the model, low-angle tilt boundaries are considered as the walls of edge lattice dislocations, while the triple junctions that terminate these boundaries contain wedge disclinations that accommodate the stress fields created by the dislocation walls. The simulation using the method of two-dimensional dislocation dynamics for the case of nanocrystalline Fe, revealed various migration modes of tilt boundaries under fatigue loading. These include the reversible migration of tilt boundaries, their split as well as their motion to adjacent high-angle grain boundaries and subsequent coalescence with these boundaries. The simulations demonstrate that the mode of boundary migration is determined by the level of the applied load and explain the recent observations of the reversible grain lattice reorientation near a crack tip in a nanocrystalline Ni-Fe alloy under fatigue loading.
AB - A model is suggested that describes collective migration of two neighboring low-angle tilt boundaries in nanocrystalline metals under fatigue loading. Within the model, low-angle tilt boundaries are considered as the walls of edge lattice dislocations, while the triple junctions that terminate these boundaries contain wedge disclinations that accommodate the stress fields created by the dislocation walls. The simulation using the method of two-dimensional dislocation dynamics for the case of nanocrystalline Fe, revealed various migration modes of tilt boundaries under fatigue loading. These include the reversible migration of tilt boundaries, their split as well as their motion to adjacent high-angle grain boundaries and subsequent coalescence with these boundaries. The simulations demonstrate that the mode of boundary migration is determined by the level of the applied load and explain the recent observations of the reversible grain lattice reorientation near a crack tip in a nanocrystalline Ni-Fe alloy under fatigue loading.
KW - STRESS-DRIVEN MIGRATION
KW - INDUCED GRAIN-GROWTH
KW - ROOM-TEMPERATURE
KW - DISLOCATION DYNAMICS
KW - PLASTIC-DEFORMATION
KW - THIN-FILMS
KW - AL
KW - NANOINDENTATION
KW - PARTICLES
KW - BEHAVIOR
M3 - статья
VL - 52
SP - 113
EP - 120
JO - Reviews on Advanced Materials Science
JF - Reviews on Advanced Materials Science
SN - 1606-5131
IS - 1-2
ER -
ID: 26266471