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Strategies to tailor serrated flows in metallic glasses

Published online by Cambridge University Press:  22 January 2019

Zhe Fan Open the ORCID record for Zhe Fan [Opens in a new window] ,
Qiang Li ,
Cuncai Fan ,
Haiyan Wang  and
Xinghang Zhang
Zhe Fan*
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Qiang Li
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Cuncai Fan*
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Haiyan Wang
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Xinghang Zhang*
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
*
a)Address all correspondence to these authors. e-mail: zfan.phd@gmail.com
b)e-mail: xzhang98@purdue.edu
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Abstract

Serrated flow is one important characteristic of shear bands through which metallic glasses (MGs) accommodate plastic deformation. Serrated flow can be affected by intrinsic properties such as elastic modulus or extrinsic variables such as strain rate. However, the influences of pre-deformation and interfaces on serrated flow are less well understood. In this study, by using in situ micropillar compression inside a scanning electron microscope, we show that pre-deformation (consisting of cyclic loading/unloading below the nominal elastic limit) suppresses serrated flows in amorphous-CuNb but enhances serrated flows in amorphous-CuZr at both high and low strain rates. Moreover, layer interfaces in Cu/amorphous-CuNb multilayers mitigate serrated flows, and the average stress drop and strain duration associated with shear banding process can be tailored. Strain accommodation and energy dissipation via shear banding have clear impact on serrated flows. This study provides new perspectives on tailoring serrated flows and enhancing plastic deformation of MGs.

Keywords

shear bandserrated flowmetallic glasspre-deformationlayer interface
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 9: Focus Issue: Plasticity and Fracture at the Nanoscales - Advances in in situ Experimentation Techniques Enabling Novel and Extreme Materials/Nanocomposite Design , 14 May 2019 , pp. 1595 - 1607
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Copyright © Materials Research Society 2019 

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