A Critical Appraisal of the Nanoindentation Creep 'Nose' Effect in Ni Thin Films
Abstract:The creep behaviour of polycrystal Ni thin films under the same maximum load (P max = 8000 μN) and different unloading periods (ranging from 1 to 250 s) has been investigated at room temperature using nanoindentation tests. A 'nose' has been observed in the unloading segment of the loadpenetration depth curve when the holding time at peak load is short and/or the unloading rate is small, and when the peak load is sufficient high. When a 'nose' presents, the apparent unloading stiffness S u, defined as dP/dh, is negative, and the reduced modulus can no longer be calculated from the Oliver-Pharr method. Taking such uncertainties into account, a critical appraisal is proposed for ranking creep propensities exhibited during nanoindentation under specified conditions.
Document Type: Research Article
Publication date: February 1, 2012
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