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Native oxides significantly modify surface mechanical properties of metals. Hardness and Young’s modulus derived from quasi-static nanoindentation are not sufficient to characterize thin oxide films due to substantial substrate effects. An  in-situ  acoustic emission (AE) monitoring of nanoindentation is introduced for thin oxide film characterization. The proposed method is a synergy of localized indentation contact AE monitoring and advanced digital signal processing algorithms. Experimental data on W(100), Cu covered by native oxides and Ni-37 at.% Al alloy that undergoes stress-induced martensitic tranformation are presented in terms of advanced statistical and energy methods. A new method is proposed that combines nanoindentation with  in-situ  AE monitoring and enables characterization of oxide fracture, film thickness and film delamination and phase transformation.

Nanoindentation Induced Acoustic Emission Monitoring of Native Oxide Fracture and Phase Transformations