The transient work hardening phenomena in crystals with edge dislocation dipole clusters

A theory of single-slip work hardening is proposed, in which the flow stress is controlled by the stress required for one group of dislocations to pass another group with the same Burgers vector but with opposite sign on a parallel slip plane. The strain and the details of the slip-line pattern are calculated as a function of stress from the known properties of edge-dislocation multipoles. The predictions of the theory are compared with experimental measurements on Mg and are found to be in fair agreement.The theory presented is a highly simplified first version, and various possible developments of it are discussed.

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Collision cascade effects near an edge dislocation dipole in alpha-Fe: Induced dislocation mobility and enhanced defect clustering

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2020.152459 ◽

2021 ◽

Vol 543 ◽

pp. 152459

Author(s):

S. Heredia-Avalos ◽

C.D. Denton ◽

J.C. Moreno-Marín ◽

E. Martinez ◽

M.J. Caturla

Keyword(s):

Edge Dislocation ◽

Collision Cascade ◽

Dislocation Mobility ◽

Dislocation Dipole ◽

Cascade Effects ◽

Induced Dislocation

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Edge dislocation dipole emission from a blunt crack tip and its morphological effects

Scripta Materialia ◽

10.1016/j.scriptamat.2005.10.025 ◽

2006 ◽

Vol 54 (4) ◽

pp. 649-653 ◽

Cited By ~ 7

Author(s):

Mingxin Huang ◽

Pedro E.J. Rivera Díaz del Castillo ◽

Zhonghua Li

Keyword(s):

Edge Dislocation ◽

Crack Tip ◽

Dislocation Dipole ◽

Blunt Crack ◽

Dipole Emission

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Formation of two edge dislocations in a grain due to interface disclination dipoles

Journal of Applied Mechanics ◽

10.1115/1.4051074 ◽

2021 ◽

pp. 1-8

Author(s):

Jerome M. Colin

Keyword(s):

Activation Energy ◽

Inclination Angle ◽

Edge Dislocation ◽

Dislocation Dipole ◽

Characteristic Parameters ◽

Grain Sizes ◽

Energy Variation ◽

Edge Dislocations

Abstract The formation of a dipole of edge dislocations inside one grain separated from the adjacent grains by two interfaces in which are lying disclination dipoles (one in each interface) has been theoretically investigated from an energy variation calculation. Critical grain sizes associated with the formation of the edge dislocation dipole have been determined as well as an activation energy. The effects of the inclination angle of the gliding plane of the dislocations and the characteristic parameters of the disclination dipoles have been finally analyzed.

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