Electroplasticity and Electrically-Assisted Deformation in Metallic Materials

Electroplasticity refers to the phenomenon whereby the mechanical behaviour of a metal is altered by the passage of an electric current, leading to reductions in flow stress and enhanced ductility during deformation. This effect arises from both thermal contributions, such as Joule heating, and athermal mechanisms, notably the electron wind force, which can mobilise dislocations and weaken atomic bonds at defect sites. Electrically-assisted deformation exploits these effects to facilitate forming processes, improve workability and enable novel microstructural transformations under milder mechanical loads. Applications span precision rolling of ultra-thin strips, texture control in duplex steels and self-healing of microcracks. By tailoring current density, pulse duration and microstructural state, one can achieve dynamic recrystallisation, grain refinement or phase transformations without extensive external heating. The resulting energy efficiencies, combined with the ability to decouple thermal and athermal contributions, impart global significance in sectors from automotive sheet forming to micro-electromechanical systems and high-performance alloys.

Research from Nature Portfolio

Recent studies have devised micromachined architectures that isolate Joule heating from electron wind forces, revealing that directional electron momentum transfer alone governs elemental diffusion and phase precipitation in duplex stainless steel. This approach clarifies how athermal effects drive σ-phase formation in constrained regions, while preserving the matrix structure. Complementary investigations at the atomic scale have decoupled electron wind and thermal influences in nanocrystals, showing that electron–dislocation interactions, rather than directional wind forces, trigger incoherent twin boundary migration under pulsed currents. These insights advance the fundamental understanding of electroplasticity and guide the design of materials resistant to electromigration damage in micro- and nano-electronics.

Electroplasticity and Electrically-Assisted Deformation in Metallic Materials publication trend

The graph below shows the total number of articles in electroplasticity and electrically-assisted deformation in metallic materials across all publications each year (not limited to Nature Index journals).

Technical terms

Electroplasticity: Reduction in flow stress and enhanced ductility of a metal under an applied electric current, involving both thermal and athermal mechanisms.

Electron wind force: Momentum transfer from drifting electrons to dislocations that promotes dislocation motion under electric current.

Joule heating: Resistive heating of a conductor when an electric current passes through it, raising local temperature.

Electropulsing: Application of high-density, short-duration electrical pulses to a material to induce microstructural changes and mechanical softening.

Flow stress: The stress required to sustain plastic deformation in a material, influenced by dislocation interactions, temperature and microstructure.

References

1. Pulsed current-assisted twelve-roll precision rolling deformation of SUS304 ultra-thin strips with exceptional mechanical properties. International Journal of Extreme Manufacturing (2024).
2. Micromachined structures decoupling Joule heating and electron wind force. Nature Communications (2024).
3. Elucidating the origin of electroplasticity in metallic materials. Applied Materials Today (2020).
4. Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties. Materials (2018).
5. Self-healing of damage inside metals triggered by electropulsing stimuli. Scientific Reports (2017).
6. Revealing the pulse-induced electroplasticity by decoupling electron wind force. Nature Communications (2022).
7. Understanding the mechanisms of electroplasticity from a crystal plasticity perspective. Modelling and Simulation in Materials Science and Engineering (2019).
8. Investigation of the electroplastic effect using nanoindentation. Materials & Design (2019).
9. Room temperature texturing of austenite/ferrite steel by electropulsing. Scientific Reports (2017).