Structural,mechanical and tribological characterization of Zn25Al alloys with Si and Sr addition |
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| Affiliation: | 1. Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11120 Belgrade 35, Serbia;2. Institute of Nuclear Sciences “Vinca”, University of Belgrade, Mike Petrovića Alasa 12-14, 11001 Belgrade, Serbia;3. Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia;1. School of Mechanical and Manufacturing Engineering, National University of Science and Technology, Islamabad, Pakistan;2. Institute of Industrial Control System, Rawalpindi, Pakistan;1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, PR China;2. Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, Canada L8S 4L7;1. Institut für Metallkunde und Metallphysik, RWTH Aachen University, Kopernikusstr. 14, 52056 Aachen, Germany;2. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow Distr., 142432 Russia;1. Northwestern Polytechnical University, Xi''an 710072, China;2. Northwest Institute for Nonferrous Metal Research, Xi''an 710016, China;1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China;2. Institute of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;3. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | The ZA-27 alloy is a zinc–aluminium casting alloy that has been frequently used as the material for sleeves of plain bearings. It has good physical, mechanical and tribological properties. However, one of the major disadvantages is its dimensional instability over a period of time (ageing). To overcome this, copper in the alloy may be replaced with silicon. Coarsening of silicon particles can be controlled by a suitable addition of strontium. In this paper, the commercial ZA-27 alloy and six different Zn25Al alloys (with 1 and 3 wt.% silicon; and with 0, 0.03 and 0.05 wt.% strontium) were obtained by casting in the preheated steel mould. Casting of the alloys was carried out at a laboratory level. In the alloys containing silicon, a finer dendritic structure was noticed compared to the structure of the commercial ZA-27 alloy. The addition of strontium influenced the size and distribution of primary silicon particles. Needle-like particles of eutectic silicon were changed into the fibrous ones. The presence of silicon and strontium did not significantly affect mechanical properties of the obtained Zn25Al alloys compared to mechanical properties of the commercial ZA-27 alloy. Wear rate of the alloys containing silicon was lower than that of the ZA-27 alloy. The addition of strontium further lowers the wear rate and slightly increases the coefficient of friction. |
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| Keywords: | Zinc alloys Strontium Microstructure Boundary lubrication Friction Wear |
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