Journal
SCRIPTA MATERIALIA
Volume 108, Issue -, Pages 52-55Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2015.05.043
Keywords
Metallic glass; Nanoindentation; Yield stress; Shear transformation zone; Deformation mode
Categories
Funding
- National Natural Science Foundation of China [11025212, 11272318, 11402233]
- Zhejiang Provincial Natural Science Foundation of China [LQ15A020004]
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Based on the statistical data of first pop-in events during nanoindentation, the shear transformation zone (STZ) volumes of metallic glassy films with various compositions were estimated through the cooperative shearing model (CSM). The experimental results indicate that the STZ volume decreases with Poisson' ratio of the sample, which contradicts with previous observations using the rate-jump method. Moreover, the critical size for deformation mode transition (i.e. the localized shearing to homogeneous flow) at nanoscale could intrinsically be correlated with STZ volume. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. This is an open access article under the CC BY-NCND license (http://creativecommons.orgflicenses/by-nc-nd/4.0/).
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