Kinetics of Plastic Deformation

Modeling of hardening and softening processes in Mg alloys

“…In the present work, tensile data for alloy AM60 collected at different temperatures will be combined with room temperature data from the literature [7] for a range of Mg-Al solid solutions. In line with previous work [6], the two sets of data will be discussed following Lukáč and Balík's model [1] for softening and hardening. * Corresponding author.…”

“…The flow stress, σ, of ductile alloys depends on the average dislocation density, ρ, as σ ∝ √ ρ [1]. The dislocation structure evolves with plastic deformation.…”

“…The latter processes are accountable for the decrease in the work-hardening rate Θ = (∂σ/∂ε)ε ,T (where ε is the true plastic strain and T is the temperature) normally observed at large applied stresses and strains. The stress dependence of the work-hardening rate in metallic materials has been modeled by a number of authors [1][2][3][4][5]. In the present work, tensile data for alloy AM60 collected at different temperatures will be combined with room temperature data from the literature [7] for a range of Mg-Al solid solutions.…”

Magnesium Alloys Based Composites

“…Assuming that the particle size and the spatial distribution of particles remain unchanged during deformation process we may consider two hardening and two softening processes. Lukáč and Balík formulated a constitutive model (Lukáč & Balík, 1994) giving the stress dependence of work hardening rate in the form…”

Hardening and Softening in Magnesium Alloys

“…(Lukáč & Balík, 1994) assumed that hardening occurs due to multiplication of dislocations at both non-dislocation obstacles and forest dislocations. As the dominant softening processes, annihilation of dislocations due to both cross slip and climb are considered.…”