Journal
ACTA MATERIALIA
Volume 107, Issue -, Pages 213-219Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.01.060
Keywords
Metallic glass; Topology; Combinatorics; Hybridization
Funding
- Deutsche Forschungsgemeinschaft [SPP-1594]
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An efficient way to study the relationship between chemical composition and mechanical properties of thin films is to utilize the combinatorial approach, where spatially resolved mechanical property measurements are conducted along a concentration gradient. However, for thin film glasses many properties including the mechanical response are affected by chemical topology. Here a novel method is introduced which enables spatially resolved short range order analysis along concentration gradients of combinatorially synthesized metallic glass thin films. For this purpose a CoZrTaB metallic glass film of 3 mu m thickness is deposited on a polyimide foil, which is investigated by high energy X-ray diffraction in transmission mode. Through the correlative chemistry-topology-stiffness investigation, we observe that an increase in metalloid concentration from 26.4 to 32.7 at% and the associated formation of localized (hybridized) metal metalloid bonds induce a 10% increase in stiffness. Concomitantly, along the same composition gradient, a metalloid -concentration-induced increase in first order metal - metal bond distances of 1% is observed, which infers itinerant (metallic) bond weakening. Hence, the metalloid concentration induced increase in hybridized bonding dominates the corresponding weakening of metallic bonds. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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