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Materials 2017, 10(6), 585; doi:10.3390/ma10060585

The Effect of Modulation Ratio of Cu/Ni Multilayer Films on the Fretting Damage Behaviour of Ti-811 Titanium Alloy

1
Institute of Corrosion and Protection, School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
2
School of Metallurgy and Materials, The University of Birmingham, Birmingham B15 2TT, UK
3
Oil & Gas Technology Research Institute, Changqing Oilfield Company, Xi’an 710018, China
*
Author to whom correspondence should be addressed.
Academic Editor: Yong-Cheng Lin
Received: 24 February 2017 / Revised: 6 May 2017 / Accepted: 22 May 2017 / Published: 26 May 2017
View Full-Text   |   Download PDF [7756 KB, uploaded 26 May 2017]   |  

Abstract

To improve the fretting damage (fretting wear and fretting fatigue) resistance of Ti-811 titanium alloy, three Cu/Ni multilayer films with the same modulation period thickness (200 nm) and different modulation ratios (3:1, 1:1, 1:3) were deposited on the surface of the alloy via ion-assisted magnetron sputtering deposition (IAD). The bonding strength, micro-hardness, and toughness of the films were evaluated, and the effect of the modulation ratio on the room-temperature fretting wear (FW) and fretting fatigue (FF) resistance of the alloy was determined. The results indicated that the IAD technique can be successfully used to prepare Cu/Ni multilayer films, with high bonding strength, low-friction, and good toughness, which yield improved room-temperature FF and FW resistance of the alloy. For the same modulation period (200 nm), the micro-hardness, friction, and FW resistance of the coated alloy increased, decreased, and improved, respectively, with increasing modulation ratio of the Ni-to-Cu layer thickness. However, the FF resistance of the coated alloy increased non-monotonically with the increasing modulation ratio. Among the three Cu/Ni multilayer films, those with a modulation ratio of 1:1 can confer the highest FF resistance to the Ti-811 alloy, owing mainly to their unique combination of good toughness, high strength, and low-friction. View Full-Text
Keywords: fretting fatigue; fretting wear; multilayer film; titanium alloy; modulation ratio fretting fatigue; fretting wear; multilayer film; titanium alloy; modulation ratio
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, X.; Liu, D.; Li, X.; Dong, H.; Xi, Y. The Effect of Modulation Ratio of Cu/Ni Multilayer Films on the Fretting Damage Behaviour of Ti-811 Titanium Alloy. Materials 2017, 10, 585.

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