Area determination with pile-up and sink-in in nanoindentation of oxygen containing titanium. (March 2022)

• Record Type: Journal Article
• Authors: Kværndrup, Frederik B.; Engelbrekt, Christian; Kücükyildiz, Ömer C.; Somers, Marcel A.J.; Christiansen, Thomas L.; Winther, Grethe
• Is Part Of: Materials today communications. Volume 30(2022)
• Publication Date: 2022-03
• Subjects: Interstitial alloys -- Mechanical properties -- Atomic force microscopy -- Elasticity -- Anisotropy; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.103218
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: Homogenous thin foils of titanium with oxygen in interstitial solid solution covering the broad solubility range of O in h.c.p. Ti, were used to investigate the sink-in and pile-up occurring during nanoindentation. The anisotropic response and indent areas were accurately analyzed with atomic force microscopy. The mechanical properties and the indent areas were assessed using both the Oliver&Pharr method and a newer method incorporating corrections for indenter geometry and an improved parameter extraction. The newer method accurately accounts for pile-up. Graphical Abstract: ga1 Highlights: Atomic force microscopy is a good diagnostic tool to analyze pile-up and sink-in. Fitting of the indent area with the image analysis software Gwyddion only works for pile-up. Oliver-Pharr and a method by Dao based on fitting of dimensionless functions correctly take sink-in into account. The Dao method accounts for pile-up and is consistent with Gwyddion.