The effect of hydrogen (H) charging on the shear yield strength (τmax) and shear transformation zone volume (Ω) 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, τmax increases significantly whereas Ω decreases. In low-Zr alloys, a slight decrease in τmax and increase in Ω 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.The work at Hanyang University was supported in part by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (No. 2013R1A1A2A10058551), and in part by the Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant funded by the Korea government (MOTIE) (No. 20134030200360). The work at KIST was supported by Convergence Agenda Program (CAP) of the Korea Research Council of Fundamental Science and Technology (KRCF)
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