The breakdown of strength size scaling in spherical nanoindentation and microcompression of metallic glasses. (15th March 2017)

• Record Type: Journal Article
• Authors: Wang, S.; Ye, Y.F.; Wang, Q.; Shi, S.Q.; Yang, Y.
• Is Part Of: Scripta materialia. Number 130(2017)
• Page Start: 283
• Page End: 287
• Publication Date: 2017-03-15
• Subjects: Metallic glass -- Size scaling -- Shear band initiation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.12.004
• Languages: English
• ISSNs: 1359-6462

Abstract

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. Graphical abstract: