Abstract
Nanoindentation simulations on a binary metallic glass were performed under various strain rates by using molecular dynamics. The rate-dependent serrated plastic flow was clearly observed, and the spatiotemporal behavior of its underlying irreversible atomic rearrangement was probed. Our findings clearly validate that the serration is a temporally inhomogeneous characteristic of such rearrangements and not directly dependent on the resultant shear-banding spatiality. The unique spatiotemporal distribution of shear banding during nanoindentation is highlighted in terms of the potential energy landscape (PEL) theory.
Highlights
Nanoindentation simulations on a binary metallic glass were performed under various strain rates by using molecular dynamics
Currently, it is well accepted that the macroscopic serrated plastic flow behavior is associated with the shear-banding operations on a nanoscale within Bulk metallic glasses (BMGs)
Schuh et al [13], Schuh and Nieh [14] and Zhang et al [18] suggested that the simultaneous operations of multiple shear bands at high strain rate result in the smooth plastic flow; with increasing strain rate, the deformation mode transits from inhomogeneous to homogeneous
Summary
Nanoindentation simulations on a binary metallic glass were performed under various strain rates by using molecular dynamics. Under deformation-constrained loading modes such as compression [9,10,11] and nanoindentation [12,13,14,15,16,17,18,19], serrated plastic flow phenomena have been widely observed and found to be rate-dependent: as strain rate decreases, the flow serrations become more distinct. Rate-dependent shear-band patterns were observed on the surfaces or inside the post-deformed specimens under compression [10] and nanoindentation [15,16,17].
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