Intrinsic versus extrinsic effects on serrated flow of bulk metallic glasses

Hu, Jing; Sun, Baoan; Yang, Yong; Liu, C.T.; Pauly, S.; Weng, Yunxuan; Eckert, J.

doi:10.1016/j.intermet.2015.06.018

Cited by 34 publications

(4 citation statements)

References 52 publications

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“…3, an upward trend of the increase of the amplitudes of the load drops was observed in the single-side-notched specimens. The upward trend of the amplitudes of the load drops with small increasing rate has been widely observed in BMG compression tests, and such trend is known to have no significant effect on the plastic-flow dynamics and can be ignored during statistical analysis of the plastic-flow dynamics131536. However, in the present single-side-notched specimens, the upward trend has a large increasing rate, which follows a power-law scaling.…”

Section: Resultsmentioning

confidence: 63%

Flaw-induced plastic-flow dynamics in bulk metallic glasses under tension

Chen

Yue

Tsui

et al. 2016

Sci Rep

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Inheriting amorphous atomic structures without crystalline lattices, bulk metallic glasses (BMGs) are known to have superior mechanical properties, such as high strength approaching the ideal value, but are susceptible to catastrophic failures. Understanding the plastic-flow dynamics of BMGs is important for achieving stable plastic flow in order to avoid catastrophic failures, especially under tension, where almost all BMGs demonstrate limited plastic flow with catastrophic failure. Previous findings have shown that the plastic flow of BMGs displays critical dynamics under compression tests, however, the plastic-flow dynamics under tension are still unknown. Here we report that power-law critical dynamics can also be achieved in the plastic flow of tensile BMGs by introducing flaws. Differing from the plastic flow under compression, the flaw-induced plastic flow under tension shows an upward trend in the amplitudes of the load drops with time, resulting in a stable plastic-flow stage with a power-law distribution of the load drop. We found that the flaw-induced plastic flow resulted from the stress gradients around the notch roots, and the stable plastic-flow stage increased with the increase of the stress concentration factor ahead of the notch root. The findings are potentially useful for predicting and avoiding the catastrophic failures in tensile BMGs by tailoring the complex stress fields in practical structural-applications.

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Section: Resultsmentioning

confidence: 63%

Flaw-induced plastic-flow dynamics in bulk metallic glasses under tension

Chen

Yue

Tsui

et al. 2016

Sci Rep

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“…It is known that the room-temperature plastic deformation of BMGs is accommodated by the initiation of shear bands, displaying serrated flows in the loading-displacement or stress-strain curves [26][27][28][29]. These flow serrations are therefore investigated inversely in many previous studies to give more insight into the plastic deformation mechanisms of BMGs [30][31][32][33][34][35][36][37][38]. As shown in Fig.…”

Section: Plastic Flowsmentioning

confidence: 99%

Achieving stable plastic flows in a Zr-based bulk metallic glass under tailored mixed-mode (I/II) loading conditions

Chen

Tang

Zheng

et al. 2020

Materials Science and Engineering: A

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“…At room temperature, the plastic deformation of BMGs is highly localized in thin layers of shear bands, demonstrating serrated plastic flows in the stress-strain curves [8,9]. The formation of the serrations is significantly affected by the applied strain rates [10][11][12] and external disturbances, such as the geometric confinement [9,13] and stress gradients [14][15][16]. For example, Schuh et al showed that with increasing loading rates, the plastic deformation in BMGs transits from serrated flows into homogeneous deformation [11].…”

Section: Introductionmentioning

confidence: 99%