Effect of hydrogen on the yielding behavior and shear transformation zone volume in metallic glass ribbons
- Authors
- Zhao, Yakai; Choi, In-Chul; Seok, Moo-Young; Kim, Min-Hyun; Kim, Do-Hyang; Ramamurty, Upadrasta; Suh, Jin-Yoo; Jang, Jae-il
- Issue Date
- Oct-2014
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Amorphous alloys; Hydrogen; Nanoindentation; Yield behavior; Shear transformation zone (STZ)
- Citation
- ACTA MATERIALIA, v.78, pp.213 - 221
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACTA MATERIALIA
- Volume
- 78
- Start Page
- 213
- End Page
- 221
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/158981
- DOI
- 10.1016/j.actamat.2014.06.046
- ISSN
- 1359-6454
- Abstract
- 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.
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