Decrease of Nano-hardness at Ultra-low Indentation Depths in Copper Single Crystal

Stanisław Kucharski , Dariusz Jarząbek , Anna Piątkowska , Stefania Woźniacka


In the present study, we report a detailed investigation of the unusual size effect in single crystals. For the experiments we specified the hardness in single crystalline copper specimens with different orientations ((001), (011) and (111)) using Oliver-Pharr method. Our results indicates that with decreasing load, after the value of the hardness reached its maximum, it starts to decrease for very small indentation depths (<150 nm). For the sake of accuracy of hardness determination we have developed two AFM-based methods to evaluate contact area between tip and indented material. The proposed exact measurement of the contact area, which includes the effect of pile-up and sink-in patterns, can partially explain the strange behaviour, however, the decrease of hardness at low loads is still observed. At higher loads range the specified hardness is practically constant.
Author Stanisław Kucharski - IPPT PAN
Stanisław Kucharski,,
, Dariusz Jarząbek (FM / IMPh) - [IPPT PAN]
Dariusz Jarząbek,,
- The Institute of Micromechanics and Photonics
, Anna Piątkowska - Institute of Electronic Materials Technology (ITME)
Anna Piątkowska,,
, Stefania Woźniacka - IPPT PAN
Stefania Woźniacka,,
Journal seriesExperimental Mechanics, ISSN 0014-4851, e-ISSN 1741-2765
Issue year2016
Publication size in sheets0.6
Keywords in Englishcopper, single crystal, nanoindentation, AFM, size effect
ASJC Classification2202 Aerospace Engineering; 2210 Mechanical Engineering; 2211 Mechanics of Materials
Languageen angielski
Score (nominal)35
Score sourcejournalList
ScoreMinisterial score = 35.0, 24-06-2020, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 24-06-2020, ArticleFromJournal
Publication indicators WoS Citations = 12; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.478; WoS Impact Factor: 2016 = 2.091 (2) - 2016=2.183 (5)
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