Zhao, Yakai Choi, In-Chul Seok, Moo-Young Kim, Min-Hyun Kim, Do-Hyang Ramamurty, Upadrasta Suh, Jin-Yoo Jang, Jae-il 2024-01-20T08:34:18Z 2024-01-20T08:34:18Z 2021-09-02 2014-10-01 1359-6454 https://pubs.kist.re.kr/handle/201004/126258 The effect of hydrogen (H) charging on the shear yield strength (tau(max)) and shear transformation zone volume (Omega) of Ni-Nb-Zr metallic glass ribbons, with varying Zr content, were studied through the first pop-in loads during nanoindentation. Weight gain measurements after H charging and desorption studies were utilized to identify how the total H absorbed during charging is partitioned into mobile and immobile (or trapped) parts. These, in turn, indicate the significant role of H mobility in the amorphous structure on the yielding behavior. In high-Zr alloys, tau(max) increases significantly whereas Omega decreases. In low-Zr alloys, a slight decrease in tau(max) and increase in Omega were noted. These experimental observations are rationalized in terms of the mobility of the absorbed H in the amorphous structure and the possible role of it in the shear transformation zone dynamics during deformation of the metallic glass. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD NI-NB-ZR DISLOCATION NUCLEATION THERMAL-STABILITY NANOINDENTATION INDENTATION TRANSITION EMBRITTLEMENT DEFORMATION DIFFUSIVITY PERMEATION Effect of hydrogen on the yielding behavior and shear transformation zone volume in metallic glass ribbons Article 10.1016/j.actamat.2014.06.046 1 ACTA MATERIALIA, v.78, pp.213 - 221 ACTA MATERIALIA 78 213 221 scie scopus 000341559400021 2-s2.0-84904272567 Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science Metallurgy & Metallurgical Engineering Article NI-NB-ZR DISLOCATION NUCLEATION THERMAL-STABILITY NANOINDENTATION INDENTATION TRANSITION EMBRITTLEMENT DEFORMATION DIFFUSIVITY PERMEATION Amorphous alloys Hydrogen Nanoindentation Yield behavior Shear transformation zone (STZ)