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

• DOI: 10.1016/j.scriptamat.2018.06.015
• Publication Date: 2018-06-19T11:22:23Z
• Authors: P. Kontis; M. Köhler; S. Evertz; Y.-T. Chen; V. Schnabel; R. Soler; J. Bednarick; C. Kirchlechner; G. Dehm; D. Raabe; J.M. Schneider; B. Gault
• Keywords: info:eu-repo/classification/ddc/670; 670; 0103 physical sciences; 02 engineering and technology; 0210 nano-technology; 01 natural sciences

Published by Elsevier Science, Amsterdam [u.a.]<br/>We report the enhancement of fracture toughness and strength of a cobalt tantalum-based metallic glass thinfilm with increasing boron content. The improvement of the mechanical performance is attributed to the formationof a compositionally lamellar compared to uniform glass microstructure, which becomes thinner with increasingboron content as revealed by transmission electron microscopy. Compositional variations across thelamellar structure are revealed by atomprobe tomography. Cobalt- and boron-rich regions alternate sequentially,whereas tantalumexhibits slight variations across the lamellae. Our results can be utilized in future design effortsfor metallic glass thin films with outstanding mechanical performance.<br/>Scripta materialia 155, 73 - 77 (2018). doi:10.1016/j.scriptamat.2018.06.015<br/>