不同温度下纯Ni/NiTi合金的摩擦特性研究

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Abstract NiTi alloy has shape memory effect and superelasticity, which makes it different from other general materials. In order to reveal its friction characteristics from a micro perspective, the dynamics of pure Ni and NiTi alloys at different temperatures were studied using molecular dynamics and Scratching process. By comparing and analyzing the changes in the atomic structure, surface morphology, friction force and friction coefficient of pure Ni and NiTi alloys during the pressing and scratching process at different temperatures, the effect of temperature on the friction coefficient of NiTi alloys was studied. The results show that the temperature has a significant effect on the friction properties of NiTi alloys. In the temperature range of 300—500 K, the lower the temperature, the smaller the friction and coefficient of friction. This is due to the martensitic phase change of the NiTi alloy during the scoring process, the surface of the NiTi alloy is recessed downward, reducing the contact between the NiTi surface and the indenter, reducing the obstacle to the indenter, and greatly reducing the friction. When the temperature increases, the martensitic phase transformation decreases and the surface of the NiTi alloy is depressed. Decreasing the degree will increase the contact area between the indenter and the NiTi alloy, and increase the obstacle, which will increase the friction force and friction coefficient. However, during the scoring process of the metal Ni without a phase change mechanism, the plastic deformation and temperature are mainly generated. It has no significant effect on its friction performance, and its friction and coefficient of friction do not fluctuate significantly at different temperatures. Therefore, tempe-rature has a certain ability to regulate the friction properties of NiTi shape memory alloys, and the purpose of reducing wear can be achieved by controlling the temperature, which provides a theoretical basis and guiding for improving the service life of NiTi alloy components.

Key words： NiTi shape memory alloy molecular dynamics friction temperature phase transition

Published: 01 July 2020

CLC number:

TB31

Fund:This work was financially supported by the Special Key Project of Chongqing Technology Innovation and Application Development(cstc2019jscx-fxydX0085);Science and Technology Research Project of Chongqing Education Commission(KJZD-K201900602).

About author:: Rui Li, received his B.S. degree in 1999 from Chongqing University of Technology, and received his M.S. degree and Ph.D. degree from Chongqing University in 2004 and 2009, respectively. His current position is a professor in Chongqing University of Posts and Telecommunications. His main research interests include intelligent detection technology, friction control and intelligent mechanical structure system ; Ping'an Yang, received his B.S. degree in electrical engineering and automation form Chongqing University of Posts and Telecommunications in 2012, and Ph.D. degree in instrument science and technology from Chongqing University in 2017. His current position is a lecturer in Chongqing University of Posts and Telecommunications. His main research interests include intelligent biomimetic composite materials, flexible sensor, electromagnetic shielding material and structural design.

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Cite this article:

LI Rui,ZENG Lingbi,LIU Teng, et al. Study on Friction Characteristics of Pure Ni/NiTi Alloy at Different Temperatures[J]. Materials Reports, 2020, 34(Z1): 297-303.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2020/V34/IZ1/297

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