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Title: The breakdown of strength size scaling in spherical nanoindentation and microcompression of metallic glasses
Authors: Wang, S
Ye, YF
Wang, Q
Shi, SQ 
Yang, Y
Keywords: Metallic glass
Shear band initiation
Size scaling
Issue Date: 2017
Publisher: Pergamon Press
Source: Scripta materialia, 2017, v. 130, p. 283-287 How to cite?
Journal: Scripta materialia 
Abstract: It was previously reported that the strength of metallic glasses (MGs) would scale inversely with the size of a sample or a deformation field, commonly known as “smaller-being-stronger”. However, based on the extensive spherical nanoindentation experiments conducted across a variety of MGs, we demonstrate that such strength-size scaling breaks down at a critical indenter tip radius, which is caused by the transition of the yielding mechanism from bulk- to surface-controlled shear band initiation. Our experimental findings also provide an explanation for the unusual strength scattering observed in the micro-compression of MGs.
ISSN: 1359-6462
EISSN: 1872-8456
DOI: 10.1016/j.scriptamat.2016.12.004
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