Zhang Xiaohua, Liu Daoxin, Li Xiaoying, Dong Hanshan, Xi Yuntao
Institute of Corrosion and Protection, School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China.
School of Metallurgy and Materials, The University of Birmingham, Birmingham B15 2TT, UK.
Materials (Basel). 2017 May 26;10(6):585. doi: 10.3390/ma10060585.
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.
为提高Ti-811钛合金的微动损伤(微动磨损和微动疲劳)抗力,通过离子辅助磁控溅射沉积(IAD)在该合金表面制备了三种调制周期厚度相同(200 nm)但调制比不同(3:1、1:1、1:3)的Cu/Ni多层膜。对薄膜的结合强度、显微硬度和韧性进行了评估,并确定了调制比对该合金室温微动磨损(FW)和微动疲劳(FF)抗力的影响。结果表明,IAD技术可成功用于制备具有高结合强度、低摩擦和良好韧性的Cu/Ni多层膜,这些多层膜可提高该合金的室温FF和FW抗力。对于相同的调制周期(200 nm),随着Ni与Cu层厚度调制比的增加,涂层合金的显微硬度、摩擦力和FW抗力分别增大、减小和提高。然而,涂层合金的FF抗力随调制比的增加并非单调增加。在这三种Cu/Ni多层膜中,调制比为1:1的多层膜能赋予Ti-811合金最高的FF抗力,这主要归因于其良好韧性、高强度和低摩擦的独特组合。