Nanoglass-Nanocrystal Composite-a Novel Material Class for Enhanced Strength-Plasticity Synergy

Area of Science:

• Materials Science
• Nanotechnology
• Physical Chemistry

Background:

• Material properties are tunable via atomic and chemical architecture.
• Nanoglasses, composed of nanosized glassy particles and amorphous interfaces, offer promising properties.
• Integrating crystalline structures within nanoglasses can further enhance material performance.

Purpose of the Study:

• To synthesize a metastable Fe-10 at% Sc nanoglass.
• To investigate the microstructure of the synthesized nanoglass.
• To evaluate the mechanical properties of the resulting composite material.

Main Methods:

• Synthesis of a metastable Fe-10 at% Sc nanoglass.
• Atomic-scale experimental characterization of the material's microstructure.
• Mechanical testing, including compression tests to determine yield strength and plastic flow.

Main Results:

• A complex hierarchical microstructure was observed at the atomic scale.
• The material consists of Fe90Sc10 amorphous matrix grains, an amorphous interfacial network enriched with hydrogen, and self-assembled pure-Fe nanocrystals.
• The composite achieved a yield strength exceeding 2.5 GPa with over 60% quasi-homogeneous plastic flow in compression.

Conclusions:

• The synthesized Fe-Sc nanoglass exhibits a unique composite structure with embedded nanocrystals.
• This microstructure results in superior mechanical properties, including high strength and significant ductility.
• The findings open new avenues for designing advanced materials with enhanced performance characteristics.