Temperature Effect on the Friction Behavior of NiTi Shape Memory Alloy

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By using an atomic force microscopy, the friction behavior of a NiTi shape memory alloy is investigated under various temperatures in vacuum environment. Under wearless condition at low loads, the adhesion-dominated friction of NiTi is almost temperature independent. However, while scratch mark appears after friction at high loads, the plough-dominated friction force is found to decrease with the increaase in temperature. Based on a simple contact analysis, the temperature dependent friction behavior of NiTi at high loads may be mainly attributed to the thermoelastic phase transition in NiTi. While temperature increases from 26~100°C, the tensile phase transition stress of NiTi increases from 412~964 MPa, which induces ~27% magnitude decrease in the contact area between the diamond tip and NiTi. It further results in the decrease in the plough-dominated friction force on NiTi.

Info:

Periodical:

Key Engineering Materials (Volumes 353-358)

Edited by:

Yu Zhou, Shan-Tung Tu and Xishan Xie

Pages:

780-783

Citation:

L. Gong et al., "Temperature Effect on the Friction Behavior of NiTi Shape Memory Alloy", Key Engineering Materials, Vols. 353-358, pp. 780-783, 2007

Online since:

September 2007

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$38.00

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