Publications

Nano-laminated thin film metallic glass design for outstanding mechanical properties

Kontis, P. and Köhler, M. and Evertz, S. and Chen, Y.-T. and Schnabel, V. and Soler, R. and Bednarick, J. and Kirchlechner, C. and Dehm, G. and Raabe, D. and Schneider, J.M. and Gault, B.

SCRIPTA MATERIALIA
Volume: 155 Pages: 73-77
DOI: 10.1016/j.scriptamat.2018.06.015
Published: 2018

Abstract
We report the enhancement of fracture toughness and strength of a cobalt‑tantalum-based metallic glass thin film with increasing boron content. The improvement of the mechanical performance is attributed to the formation of a compositionally lamellar compared to uniform glass microstructure, which becomes thinner with increasing boron content as revealed by transmission electron microscopy. Compositional variations across the lamellar structure are revealed by atom probe tomography. Cobalt- and boron-rich regions alternate sequentially, whereas tantalum exhibits slight variations across the lamellae. Our results can be utilized in future design efforts for metallic glass thin films with outstanding mechanical performance. © 2018 Acta Materialia Inc.

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