Effect of hydrogen on the yielding behavior and shear transformation zone volume in metallic glass ribbons

Zhao, Yakai and Choi, In-Chul and Seok, Moo-Young and Kim, Min-Hyun and Kim, Do-Hyang and Ramamurty, Upadrasta and Suh, Jin-Yoo and Jang, Jae-il (2014) Effect of hydrogen on the yielding behavior and shear transformation zone volume in metallic glass ribbons. In: ACTA MATERIALIA, 78 . pp. 213-221.

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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. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	ACTA MATERIALIA
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND.
Keywords:	Amorphous alloys; Hydrogen; Nanoindentation; Yield behavior; Shear transformation zone (STZ)
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	08 Nov 2014 04:58
Last Modified:	08 Nov 2014 04:58
URI:	http://eprints.iisc.ac.in/id/eprint/50151

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