Preprint Article Version 1 This version is not peer-reviewed

Bending, Nanoindentation and Plasticity Noise in FCC Single and Poly Crystals

Version 1 : Received: 21 October 2019 / Approved: 22 October 2019 / Online: 22 October 2019 (15:32:12 CEST)

How to cite: Bolin, R.; Yavas, H.; Song, H.; Hemker, K.J.; Papanikolaou, S. Bending, Nanoindentation and Plasticity Noise in FCC Single and Poly Crystals. Preprints 2019, 2019100259 (doi: 10.20944/preprints201910.0259.v1). Bolin, R.; Yavas, H.; Song, H.; Hemker, K.J.; Papanikolaou, S. Bending, Nanoindentation and Plasticity Noise in FCC Single and Poly Crystals. Preprints 2019, 2019100259 (doi: 10.20944/preprints201910.0259.v1).

Abstract

We present a high-throughput nanoindentation study of in-situ bending effects on incipient plastic deformation behavior of polycrystalline and single-crystalline pure aluminum and pure copper at ultra-nano depths (<200nm). We find that hardness displays a statistically inverse dependence on in-plane stress for indentation depths smaller than 10nm, and the dependence disappears for larger indentation depths. In addition, plastic noise in the nanoindentation force and displacement displays statistically robust noise features, independently of applied stresses. Our experimental results suggest the existence of a regime in FCC crystals where ultra-nano hardness is sensitive to residual applied stresses, but plasticity pop-in noise is insensitive to it.

Subject Areas

nanoindentation; pop-in; crystal plasticity; hardness; avalanches; noise; face-centered cubic

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