On anomalous depth-dependency of the hardness of NiTi shape memory alloys in spherical nanoindentation

Yan, Wenyi, Amini, Abbas and Sun, Qingping 2013, On anomalous depth-dependency of the hardness of NiTi shape memory alloys in spherical nanoindentation, Journal of materials research, vol. 28, no. 15, pp. 2031-2039.

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Title On anomalous depth-dependency of the hardness of NiTi shape memory alloys in spherical nanoindentation
Author(s) Yan, Wenyi
Amini, Abbas
Sun, Qingping
Journal name Journal of materials research
Volume number 28
Issue number 15
Start page 2031
End page 2039
Total pages 9
Publisher Cambridge University Press
Place of publication Cambridge, England
Publication date 2013
ISSN 0884-2914
Keyword(s) aerospace engineering
aerospace materials
mechanical engineering
Summary An experimental study on the indentation hardness of NiTi shape memory alloys (SMAs) by using a spherical indenter tip and a finite element investigation to understand the experimental results are presented in this paper. It is shown that the spherical indentation hardness of NiTi SMAs increases with the indentation depth. The finding is contrary to the recent study on the hardness of NiTi SMAs using a sharp Berkovich indenter tip, where the interfacial energy plays a dominant role at small indentation depths. Our numerical investigation indicates that the influence of the interfacial energy is not significant on the spherical indentation hardness of SMAs. Furthermore, the depth dependency of SMA hardness under a spherical indenter is explained by the elastic spherical contact theory incorporating the deformation effect of phase transformation of SMAs. Hertz theory for purely elastic contact shows that the spherical hardness increases with the square root of the indentation depth. The phase transformation beneath the spherical tip weakens the depth effect of a purely elastic spherical hardness. This study enriches our knowledge on the basic concept of hardness for SMAs under spherical indentation at micro- and nanoscales.
Language eng
Field of Research 091299 Materials Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30054839

Document type: Journal Article
Collection: Institute for Frontier Materials
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Created: Thu, 08 Aug 2013, 08:48:06 EST by Nadine Langeder

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