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Nanoindentation response of an ion irradiated Zr-based bulk metallic glass

Raghavan, R and Kombaiah, B and Doebeli, M and Erni, R and Ramamurty, U and Michler, J (2012) Nanoindentation response of an ion irradiated Zr-based bulk metallic glass. In: Materials Science and Engineering A, 532 . pp. 407-413.

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Official URL: http://dx.doi.org/10.1016/j.msea.2011.11.004

Abstract

Nanoindentation experiments were conducted on a Ni+ ion-irradiated Zr-based bulk metallic glass (BMG). The irradiation was carried out using 2.5, 5, 10 and 15 MeV ions and a flux of similar to 10(16) ions/cm(2). Post mortem imaging of the indents reveals a transition in the deformation mechanism of the irradiated regions from heterogeneous shear banding to homogeneous flow. Additionally, the load-displacement curves exhibit a transition from serrated to continuous flow with increasing severity of irradiation damage. The stress-strain response obtained from micro-pillar compression experiments complements the indentation response exhibiting a decrease in the flow stress and an `apparent' strain hardening at the lowest irradiation damage investigated, which is not observed in the as-cast alloy. (C) 2011 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Bulk amorphous alloys;Micromechanics;Nanoindentation;Shear bands
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 04 Apr 2012 09:53
Last Modified: 04 Apr 2012 09:53
URI: http://eprints.iisc.ernet.in/id/eprint/44178

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