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31-08-2016 | Issue 11/2016

Metallurgical and Materials Transactions A 11/2016

Serration Behavior of a Zr-Based Metallic Glass Under Different Constrained Loading Conditions

Journal:
Metallurgical and Materials Transactions A > Issue 11/2016
Authors:
G. N. Yang, J. L. Gu, S. Q. Chen, Y. Shao, H. Wang, K. F. Yao
Important notes
Manuscript submitted February 23, 2016.

Abstract

To understand the plastic behavior and shear band dynamics of metallic glasses (MGs) being tuned by the external constraint, uniaxial compression tests were performed on Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 MG samples with aspect ratios of 0.5:1, 1:1, 1.5:1, 2:1, 2.5:1, and 3:1. Better plasticity was observed for the samples with smaller aspect ratio (under higher constraint degree). In the beginning of yielding, increasing serration (jerky stress drop) size on the loading curves was noticed for all samples. Statistical analysis of the serration patterns indicated that the small stress-drop serrations and large stress-drop serrations follow self-organized critical and chaotic dynamics, respectively. Under constrained loading, the large stress-drop serrations are depressed, while the small stress-drop serrations are less affected. When changing the external constraint level by varying the sample aspect ratio, the serration pattern, shear band dynamics, and plastic behavior will change accordingly. This study provides a perspective from tuning shear band dynamics to understand the plastic behavior of MGs under different external constraint.

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