High temperature dislocation processes in precipitation hardened crystals investigated by a 3D disctete dislocation dynamics

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Publikace nespadá pod Pedagogickou fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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ZÁLEŽÁK Tomáš SVOBODA Jiří DLOUHY Antonín

Rok publikování 2017
Druh Článek v odborném periodiku
Časopis / Zdroj INTERNATIONAL JOURNAL OF PLASTICITY
Fakulta / Pracoviště MU

Přírodovědecká fakulta

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Doi http://dx.doi.org/10.1016/j.ijplas.2017.04.017
Klíčová slova 3D discrete dislocation dynamics; Dislocations; Strengthening mechanisms; Low angle grain boundaries; Particulate reinforced material
Popis 3D discrete dislocation dynamics is employed to investigate motion of general mixed dislocation segments subjected to high temperature loadings in microstructures with impenetrable particles. The implementations of the model first address several benchmark processes including shrinkage of a glissile dislocation loop driven by self-stresses and an annihilation of mutually interacting co-axial prismatic dislocation loops. In particular, we show that models of the microstructure with planar and/or translational symmetry improve efficiency, speed and stability of the calculations. Our simulations then focus on migration of low angle dislocation boundaries in an array of particles while taking into account all mutual dislocation-dislocation interactions and the action of an externally applied stress. The results show for the first time that the, migration of tilt dislocation boundaries in crystals with particles can be associated with threshold stresses. The calculated thresholds are in a good agreement with experimental threshold stresses that characterize creep behaviour of precipitation hardened alloys. (c) 2017 Elsevier Ltd. All rights reserved.
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