Nature of substructural hardening

A Composite Grain Model of Strengthening for SPD Produced UFG Materials

“…The reverse stresses acting at the source from one or n-dislocations can be estimated by the following relation [31]: …”

Thermally activated glide of edge superdislocations in a single-crystalline Ni3Ge alloy with point defects

“…1b and c) are decreased. The thermally induced increase in the density of curvilinear superdislocations is associated with the interaction of edge superdislocation components with point defects [2][3][4][5][6][7][8][9][10][11][12][13][14][15]18]. The point defects are trapped by mobile superdislocation segments.…”

“…Investigations into the dislocation-structure evolution pattern as a function of the orientation of the axis of strain in Ni 3 Ge single crystals suggest that the evolution process involves substructures of the homogeneous type [7] the basic configurations involved are rectilinear and curvilinear superdislocations, dipoles and dipole configurations, dislocation debris [8] in the form of series of loops of small radii or narrow dipoles. We have examined the temperature dependence of the scalar dislocation density and rectilinear dislocation density at varying strains.…”

Current pattern of plastic deformation stages

“…Dependence of the strain hardening coefficient θ (curve 1) and rates of accumulation of scalar (dρ/dε, curve 2) and excess dislocation densities (dρ ± /dε, curve 3) and of broken subboundaries (dТ/dε, curve 4) on the degree of the true strain (ε true ) of ordered Ni 3 Fe alloy. Dashed straight lines indicate deformation stages [41]. density [4,21] in the bulk of the grain is not reached, but it has been reached in the region adjacent to the boundary.…”