Mechanical Alloying and Plastic Deformation in Metallic Alloys

Mechanical alloying and plastic deformation constitute complementary strategies for tailoring the microstructure and mechanical performance of metallic alloys. Mechanical alloying employs repeated fracturing and cold welding of elemental or pre‐alloyed powders, often conducted in high-energy ball mills, to produce supersaturated solid solutions, metastable phases and nanocrystalline structures. Plastic deformation techniques such as high-pressure torsion, equal-channel angular pressing and severe shear deformation refine grains to the submicrometre or nanometre scale, introduce high densities of dislocations and promote phase transformations. The interplay between deformation-induced defect generation and atomic diffusion drives the formation of ultrafine-grained alloys with enhanced strength, ductility and functional properties. Applications range from lightweight structural components and wear-resistant surfaces to shape-memory and high-temperature materials. Recent advances have deepened mechanistic understanding of defect evolution, phase stability under strain and the routes to bulk consolidation of powder-derived composites.

Research from Nature Portfolio

Recent studies have elucidated the pathway to deformation-induced supersaturation in copper–silver alloys subjected to high-pressure torsion, revealing that precipitate dissolution accelerates once particle dimensions fall below a critical nanometre threshold. Atomistic modelling linked the observed phase stability to enthalpic differences between coherent layered structures and random solid solutions. In parallel, work on aluminium–silicon alloys under extreme shear deformation demonstrated multiscale fragmentation of eutectic silicon lamellae and grain refinement to nanometre dimensions. These non-equilibrium microstructures exhibit two-fold enhancements in flow stress and reveal distinctive defect networks, providing a foundation for predictive models of hierarchical microstructural evolution under intense shear.

Mechanical Alloying and Plastic Deformation in Metallic Alloys publication trend

The graph below shows the total number of articles in mechanical alloying and plastic deformation in metallic alloys across all publications each year (not limited to Nature Index journals).

Technical terms

Mechanical alloying: High-energy powder processing method that induces repeated cold welding and fracturing to form new phases.

Plastic deformation: Permanent shape change in a material under applied stress beyond the elastic limit.

High-pressure torsion: Severe plastic deformation technique applying compressive force and rotational shear to a disc or ring.

Severe plastic deformation: Family of methods introducing very high strains to refine microstructures to ultrafine or nanometre scale.

Grain refinement: Reduction of crystalline domain size, typically to submicrometre or nanometre levels, enhancing strength.

Nanocrystalline: Material consisting of grains smaller than 100 nm in diameter.

Supersaturation: Non-equilibrium state in which solute concentration exceeds equilibrium solubility, stabilised by defects.

Dislocation: Line defect in a crystal lattice that enables plastic deformation by slip of atomic planes.

References

1. Unveiling the mechanism of deformation-induced supersaturation. Scientific Reports (2024).
2. Extreme shear-deformation-induced modification of defect structures and hierarchical microstructure in an Al–Si alloy. Communications Materials (2020).
3. High strength nanocrystalline Cu–Co alloys with high tensile ductility. Journal of Materials Research (2018).
4. Нові карбіди Ti2CuCx та Ti3Cu2Cx, отримані спіканням продуктів механохімічного синтезу шихти Ti-Cu з добавками вуглецевих нанотрубок. Physics and Chemistry of Solid State (2019).
5. Phase Transformation and Morphology Evolution of Ti50Cu25Ni20Sn5 during Mechanical Milling. Materials (2018).