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Metals 2015, 5(3), 1188-1196; doi:10.3390/met5031188

The Self-Organized Critical Behavior in Pd-based Bulk Metallic Glass

1
Laboratory of Applied Physics and Mechanics of Advanced Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
3
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Yong Zhang
Received: 25 May 2015 / Revised: 19 June 2015 / Accepted: 25 June 2015 / Published: 6 July 2015
(This article belongs to the Special Issue Serration and Noise Behavior in Advanced Materials)
View Full-Text   |   Download PDF [462 KB, uploaded 6 July 2015]   |  

Abstract

Bulk metallic glasses (BMGs) deform irreversibly through shear banding manifested as serrated-flow behavior during compressive tests. The strain-rate-dependent plasticity under uniaxial compression at the strain rates of 2 × 10−2, 2 × 10−3, and 2 × 10−4·s−1 in a Pd-based BMG is investigated. The serrated flow behavior is not observed in the stress-strain curve at the strain rate of 2 × 10−2·s−1. However, the medial state occurs at the strain rates of 2 × 10−3·s−1, and eventually the self-organized critical (SOC) behavior appears at the strain rate of 2 × 10−4·s−1. The distribution of the elastic energy density shows a power-law distribution with the power-law exponent of −2.76, suggesting that the SOC behavior appears. In addition, the cumulative probability is well approximated by a power-law distribution function with the power-law exponent of 0.22 at the strain rate of 2 × 10−4·s−1. The values of the goodness of fit are 0.95 and 0.99 at the strain rates of 2 × 10−3 and 2 × 10−4·s−1, respectively. The transition of the dynamic serrated flows of BMGs is from non-serrated flow to an intermediate state and finally to the SOC state with decreasing the strain rates. View Full-Text
Keywords: bulk metallic glass; serrated flow; plasticity; self-organized critical behavior bulk metallic glass; serrated flow; plasticity; self-organized critical behavior
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, Z.; Li, J.; Zhang, W.; Qiao, J.; Wang, B. The Self-Organized Critical Behavior in Pd-based Bulk Metallic Glass. Metals 2015, 5, 1188-1196.

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