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

Katnagallu, S. and Wu, G. and Singh, S.P. and Nandam, S.H. and Xia, W. and Stephenson, L.T. and Gleiter, H. and Schwaiger, R. and Hahn, H. and Herbig, M. and Raabe, D. and Gault, B. and Balachandran, S.

Volume: 16 Pages:
DOI: 10.1002/smll.202004400
Published: 2020

The properties of a material can be engineered by manipulating its atomic and chemical architecture. Nanoglasses which have been recently invented and comprise nanosized glassy particles separated by amorphous interfaces, have shown promising properties. A potential way to exploit the structural benefits of nanoglasses and of nanocrystalline materials is to optimize the composition to obtain crystals forming within the glassy particles. Here, a metastable Fe-10 at% Sc nanoglass is synthesized. A complex hierarchical microstructure is evidenced experimentally at the atomic scale. This bulk material comprises grains of a Fe90Sc10 amorphous matrix separated by an amorphous interfacial network enriched and likely stabilized by hydrogen, and property-enhancing pure-Fe nanocrystals self-assembled within the matrix. This composite structure leads a yield strength above 2.5 GPa with an exceptional quasi-homogeneous plastic flow of more than 60% in compression. This work opens new pathways to design materials with even superior properties. © 2020 The Authors. Published by Wiley-VCH GmbH

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