Park, T. G. Kim, S. Y. Ahn, H. S. Oh, H. S. Kim, D. H. Chang, H. J. Park, E. S. 2024-01-19T19:34:29Z 2024-01-19T19:34:29Z 2021-09-02 2019-07 1359-6454 https://pubs.kist.re.kr/handle/201004/119843 Herein, we systematically investigated how to tailor correlative fluctuation and related properties in Ni-Nb-Zr metallic glasses (MGs). The Ni60Nb40-xZrx MGs (x = 0-20 at.%) with Nb-Zr atomic pair (Delta H-mix=+4 kJ/mot) exhibited correlative atomic scale fluctuations in composition and topological orders upon Zr addition up to 20 at.% in XAFS analysis, which would, in turn, lead to fluctuations in local elastic properties. Interestingly, a statistical analysis of strain burst sizes along with in situ bending test showed that more effective elastic interaction between weak spots upon loading is promoted in Ni60Nb20Zr20, due to correlative atomic scale fluctuations, thereby resulting in multiple shear bands. The bulk specimens (d =1 mm) for 8 and 10 at.% of Zr with increased glass -forming ability (GFA) exhibited enhanced plasticity without the reduction of fracture strength, implying cooling rate effect on fluctuation-induced plasticity. We believe that the results of this study would provide an effective guideline for tuning correlative fluctuation and related properties in MGs via manipulation of enthalpy relationship and cooling rate. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD FORMING ABILITY PHASE-SEPARATION MECHANICAL-PROPERTIES AMORPHOUS-ALLOYS AG ADDITION CU-NI PLASTICITY ENHANCEMENT MICROSTRUCTURE DEFORMATION Tuning correlative atomic scale fluctuation and related properties in Ni-Nb-Zr metallic glasses Article 10.1016/j.actamat.2019.04.045 1 ACTA MATERIALIA, v.173, pp.52 - 60 ACTA MATERIALIA 173 52 60 scie scopus 000472812300007 2-s2.0-85065419230 Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science Metallurgy & Metallurgical Engineering Article FORMING ABILITY PHASE-SEPARATION MECHANICAL-PROPERTIES AMORPHOUS-ALLOYS AG ADDITION CU-NI PLASTICITY ENHANCEMENT MICROSTRUCTURE DEFORMATION Metallic glass Positive heat of mixing Correlative fluctuations Cooling rate Plasticity