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 ultranano depths (< 200 nm). We find that hardness displays a statistically inverse dependence on in-plane stress for indentation depths smaller than 10 nm, and the dependence disappears for larger indentation depths. In contrast, 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 Face Centered Cubic (FCC) crystals where ultranano hardness is sensitive to residual applied stresses, but plasticity pop-in noise is insensitive to it.
Highlights
Nanoindentation provides a unique opportunity to probe mechanical deformation at the nanoscale of any solid surface
We investigate the role and character of the secondary pop-ins, namely the collective noise that emerges during nanoindentation at low depths
We present our main results on the correlation between hardness and secondary pop-in bursts in Face Centered Cubic (FCC) polycrystalline pure aluminum, single-crystalline pure aluminum and single crystalline pure copper
Summary
Nanoindentation provides a unique opportunity to probe mechanical deformation at the nanoscale of any solid surface. Nanoindentation primary pop-in bursts initiate crystal plasticity and are known to be driven by surface dislocation nucleation [32] due to large stress concentrations at the indentation tip. We investigate the role and character of the secondary pop-ins, namely the collective noise that emerges during nanoindentation at low depths (
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