Kim, Hong-Kyu Lee, Mirim Lee, Kwang-Ryeol Lee, Jae-Chul 2024-01-20T11:31:07Z 2024-01-20T11:31:07Z 2021-09-05 2013-10 1359-6454 https://pubs.kist.re.kr/handle/201004/127586 Minor elements, when added to binary amorphous alloys in small percentages, can often lead to significant improvements in both the plasticity and glass-forming ability (GFA) of the alloys. Considering that plasticity and GFA are two contrasting properties dependent on short-range orders (SROs) of differing degrees, this experimental observation at first seems paradoxical when considered from an SRO viewpoint. In this study, comparative studies on amorphous alloys Cu50Zr50 and Cu47.5Zr47.5Al5 were performed using experiments and simulations to elucidate how these two apparently mutually exclusive properties can be realized at the same time. Using molecular dynamics simulations, we resolved the local structures of Cu50Zr50 and Cu47.5Zr47.5Al5 in terms of icosahedral medium-range orders. In addition, the role of the minor element (Al) on the formation of the icosahedra and their medium-range structures during cooling, as well as their disordering behavior during subsequent plastic relaxation, was clarified. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD BULK METALLIC-GLASS MEDIUM-RANGE ORDER X-RAY-SCATTERING CU-ZR ATOMIC PACKING MECHANICAL-PROPERTIES TRANSITION DYNAMICS EXAFS FLOW How can a minor element added to a binary amorphous alloy simultaneously improve the plasticity and glass-forming ability? Article 10.1016/j.actamat.2013.07.044 1 ACTA MATERIALIA, v.61, no.17, pp.6597 - 6608 ACTA MATERIALIA 61 17 6597 6608 scie scopus 000324791700025 2-s2.0-84883744169 Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science Metallurgy & Metallurgical Engineering Article BULK METALLIC-GLASS MEDIUM-RANGE ORDER X-RAY-SCATTERING CU-ZR ATOMIC PACKING MECHANICAL-PROPERTIES TRANSITION DYNAMICS EXAFS FLOW Amorphous alloy Short-range order Medium-range order Molecular dynamics Mechanical properties