Crystals, Volume 9, Issue 12 (December 2019) – 73 articles
Cover Story (view full-size image): Nanoindentation may probe mechanical deformation at the nanoscale of any crystalline surface, but plasticity-induced noise commonly hinders materials science. We present a high-throughput nanoindentation study of in situ bending effects on incipient plastic deformation behavior of pure aluminum and pure copper at small depths (<200 nm) with a focus on the statistical aspects of responses. Plastic noise in the nanoindentation force and displacement displays statistically robust noise features, independently of applied stresses, but hardness displays a statistical but strong sensitivity on in-plane tension for indentation depths smaller than 10 nm, consistent with dislocation theory and simulations. A regime exists in face centered cubic (FCC) crystals where ultranano hardness is sensitive to residual stress, but plasticity noise is insensitive to it. View this paper
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