Lamella (surface anatomy)

Deformation (meteorology)

Magnesium alloy

Slip (aerodynamics)

Metallurgy

Materials science

Ultimate tensile strength

Magnesium

Ductility (Earth science)

Creep

Grain boundary

Thermodynamics

Physics

Intergranular corrosion

Work hardening

Alloy

Microstructure

Composite material

Deformation mechanism

Materials Research Letters

By introducing heterogeneous lamella-structure, we obtained a superior strength-ductility synergy in Mg-alloy associated with excellent strain-hardening ability, i.e. yield strength of ∼251 MPa, tensile strength of ∼393 MPa and elongation of ∼23%. By using advanced characterization techniques, we showed that strengthening was mainly caused by the non-uniform distribution of hetero-deformation induced (HDI) stress associated with grain-boundary disclinations, which are mediated by heterogeneous multi-grain interactions. Induced by grain-boundary disclinations and intergranular slip transfers, a variety of abnormal deformation modes have been activated，which contributed significantly to enhanced ductility. This work suggests a new avenue to evade strength-ductility trade-off dilemma in Mg-alloys.

High strength and high ductility achieved in a heterogeneous lamella-structured magnesium alloy