Plastic Deformation Mechanisms in Metallic and Polycrystalline Materials

Plastic deformation in metals and polycrystalline solids arises from irreversible changes in shape under applied stress. At the atomic scale, it is mediated by the motion of dislocations—line defects whose glide along crystallographic planes enables macroscopic slip. The activation of distinct slip systems is dictated by crystal structure, orientation, temperature, strain rate and internal stress state. Deformation twinning provides an additional mode of shape change, particularly in low-symmetry or high-strength alloys, by mirror rearrangement of the lattice. In polycrystals, grain boundaries act both as barriers to dislocation motion and as sources or sinks for defects; collective interactions lead to strain hardening, dynamic recovery and, at elevated temperatures, recrystallisation. Contemporary research has broadened our understanding of flow localisation, adiabatic heating and the role of microstructural length scales, with implications for alloy design, advanced forming and performance under extreme conditions. The interplay between experiment, modelling and in situ characterisation continues to drive innovations in high-performance structural and functional materials.

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Plastic Deformation Mechanisms in Metallic and Polycrystalline Materials publication trend

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Technical terms

Dislocation: a line defect within a crystal whose motion under stress enables permanent shape change.
Slip system: a specific crystallographic plane and direction along which dislocations glide.
Deformation twinning: a mechanism of plasticity in which the lattice reorients by mirror symmetry across a twin plane.
Grain boundary: interface between differently oriented crystals that impedes defect motion and influences recrystallisation.
Strain hardening: process where accumulated defects raise a material’s resistance to further deformation.
Severe plastic deformation: a family of techniques imposing high strains to refine grains and enhance mechanical properties through extreme defect accumulation.

References

1. Constitutive modeling of deformation behavior of high-entropy alloys with face-centered cubic crystal structure. Materials Research Letters (2017).
2. Autowave Physics of Material Plasticity. Crystals (2019).
3. Experimental and numerical analyses of microstructure evolution of Cu-Cr-Zr alloys during severe plastic deformation. Materials Characterization (2019).