Abstract
Intermittent or serrated plastic flows have been widely observed in irreversible deformation through shear banding in bulk metallic glasses (BMGs). The strain-rate-dependent plasticity under uniaxial compression at 2 × 10−3, 2 × 10−4, and 2 × 10−5 s−1 in a Zr-based BMG is investigated. Serration events have a typical time scale at a relatively higher strain rate (2 × 10−3 s−1), while at lower strain rates, there is a lack of typical time scale. During serrations, the stress is falling rapidly, and the amplitude of the stress drop between the neighboring serrations is approximately equal. The stress drop vs time satisfies the exponential decay rule during jerk flows. Due to the serrated flow corresponding to the internal shear process, the free-volume model and stick–slip model are introduced to explain how the shear bands form and propagate and the cooperation of multiple shear bands. The mechanism is explained by relating the atomic-scale deformation with the macroscopic shear-band behavior, offering key ingredients to fundamentally cognize serrations in jerk flows.
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Acknowledgments
J.W.Q. would like to acknowledge the financial support of National Natural Science Foundation of China (No. 51101110 and No. 51371122), Technology Foundation for Selected Overseas Chinese Scholar, Ministry of Human Resources and Social Security of China, and the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi (2013). H.J.Y. would like to acknowledge the financial support from the National Natural Science Foundation of China (No. 51341006), State Key Lab of Advanced Metals and Materials (No. 2013-Z03), the Youth Science Foundation of Shanxi Province, China (No. 2014021017-3), and the financial supports from Key Laboratory of Cryogenics, TIPC, CAS (Grant No. CRYO201306). P.K.L. appreciates the financial support from US National Science Foundation (DMR-0909037, CMMI-0900271, and CMMI-1100080).
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Manuscript submitted March 31, 2014.
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Wang, Z., Qiao, J.W., Yang, H.J. et al. Serration Dynamics in a Zr-Based Bulk Metallic Glass. Metall Mater Trans A 46, 2404–2414 (2015). https://doi.org/10.1007/s11661-014-2483-y
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DOI: https://doi.org/10.1007/s11661-014-2483-y