Nanofretting behaviors of NiTi shape memory alloy

Qian, Linmao, Zhou, Zhongrong, Sun, Qingping and Yan, Wenyi 2007, Nanofretting behaviors of NiTi shape memory alloy, Wear, vol. 263, no. 1-6, pp. 501-507, doi: 10.1016/j.wear.2006.12.045.

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Title Nanofretting behaviors of NiTi shape memory alloy
Author(s) Qian, Linmao
Zhou, Zhongrong
Sun, Qingping
Yan, Wenyi
Journal name Wear
Volume number 263
Issue number 1-6
Start page 501
End page 507
Publisher Elsevier B.V.
Place of publication Amsterdam, Netherlands
Publication date 2007-09-10
ISSN 0043-1648
Keyword(s) nanofretting
nickel titanium shape memory alloy
Summary Nanofretting refers to cyclic movements of contact interfaces with the relative displacement amplitude at the nanometer scale, where the contact area and normal load are usually much smaller than those in fretting. Nanofretting widely exists in microelctromechanical systems (MEMS) and may become a key tribological concern besides microwear and adhesion. With a triboindenter, the nanofretting behaviors of a nickel titanium (NiTi) shape memory alloy are studied under various normal loads (1–10 mN) and tangential displacement amplitudes (2–500 nm) by using a spherical diamond tip. Similar to fretting, the nanofretting of NiTi/diamond pair can also be divided into different regimes upon various shapes of tangential force–displacement curves. The dependence of nanofretting regime on the normal load and the displacement amplitude can be summarized in a running condition nanofretting map. However, due to the surface and size effects, nanofretting operates at some different conditions, such as improved mechanical properties of materials at the nanometer scale, small apparent contact area and single-asperity contact behavior. Consequently, different from fretting, nanofretting was found to exhibit several unique behaviors: (i) the maximum tangential force in one cycle is almost unchanged during a nanofretting test, which is different from a fretting test where the maximum tangential force increases rapidly in the first dozens of cycles; (ii) the tangential stiffness in nanofretting is three orders magnitude smaller than that in fretting; (iii) the friction coefficient in nanofretting is much lower than that in fretting in slip regime; (iv) no obvious damage was observed after 50 cycles of nanofretting under a normal load of 10 mN.
Language eng
DOI 10.1016/j.wear.2006.12.045
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007, Elsevier B.V.
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