Journal
ACTA MATERIALIA
Volume 78, Issue -, Pages 213-221Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.06.046
Keywords
Amorphous alloys; Hydrogen; Nanoindentation; Yield behavior; Shear transformation zone (STZ)
Funding
- National Research Foundation of Korea (NRF) Grant - Korea government (MSIP) [2013R1A1A2A10058551]
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant - Korea government (MOTIE) [20134030200360]
- Convergence Agenda Program (CAP) of the Korea Research Council of Fundamental Science and Technology (KRCF)
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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.
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