Loading-rate-independent delay of catastrophic avalanches in a bulk metallic glass

S. H. Chen, Kang Cheung Chan, G. Wang, F. F. Wu, L. Xia, J. L. Ren, J. Li, K. A. Dahmen, P. K. Liaw

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)

Abstract

The plastic flow of bulk metallic glasses (BMGs) is characterized by intermittent bursts of avalanches, and this trend results in disastrous failures of BMGs. In the present work, a double-side-notched BMG specimen is designed, which exhibits chaotic plastic flows consisting of several catastrophic avalanches under the applied loading. The disastrous shear avalanches have, then, been delayed by forming a stable plastic-flow stage in the specimens with tailored distances between the bottoms of the notches, where the distribution of a complex stress field is acquired. Differing from the conventional compressive testing results, such a delaying process is independent of loading rate. The statistical analysis shows that in the specimens with delayed catastrophic failures, the plastic flow can evolve to a critical dynamics, making the catastrophic failure more predictable than the ones with chaotic plastic flows. The findings are of significance in understanding the plastic-flow mechanisms in BMGs and controlling the avalanches in relating solids.
Original languageEnglish
Article number21967
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 25 Feb 2016

ASJC Scopus subject areas

  • General

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