A Nanoglass‐Crystalline TbFe Composite with Exceptional Tensile Ductility

Nanostructured alloys and metallic glasses (MGs) typically exhibit low tensile ductility, while composite nanostructures with intermetallics improve mechanical performance mainly under compression. A composite nanostructure is reported here achieved via a single‐step melt spinning process with a non‐equilibrium ductile crystalline Tb 80 Fe 20 phase dispersed in a nanoglass Tb 50 Fe 50 matrix. The high density of nano‐amplitude pop‐in events evidenced during nanoindentation tests strengthened the proposition that heterogeneous interfaces discretize the shear banding in 3D nanoglass matrix – a key mechanism to improve ductility of MGs. Consequently, the nanoglass‐crystalline composite achieved a tensile plasticity of ≈22% and a total elongation to failure of ∼39%. These findings confirm the potential for designing highly ductile nanostructured materials, essential for advanced structural applications.