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We present a high-throughput nanoindentation study of in-situ bending effectson incipient plastic deformation behavior of polycrystalline andsingle-crystalline pure aluminum and pure copper at ultra-nano depths (<200nm).We find that hardness displays a statistically inverse dependence on in-planestress for indentation depths smaller than 10nm, and the dependence disappearsfor larger indentation depths. In addition, plastic noise in thenanoindentation force and displacement displays statistically robust noisefeatures, independently of applied stresses. Our experimental results suggestthe existence of a regime in FCC crystals where ultra-nano hardness issensitive to residual applied stresses, but plasticity pop-in noise isinsensitive to it.

Bending, Nanoindentation and Plasticity Noise in FCC single and poly crystals