Evaluation of the cryogenic effect on friction stir processed AA7075/Si matrix nanocomposites

Journal of Modern Processes in Manufacturing and Production

دوره 12، شماره 4، بهمن 2023

نوع مقاله: Research Paper

نویسندگان

Navid Molla Ramezani^{* 1}؛ Behnam Davoodi²

¹School of Mechanical Engineering , Iran University of Science and Technology, Tehran, Iran

²School of Mechanical EngineeringIran University of Science and TechnologyTehranIran

چکیده

Friction-stir processing is a green manufacturing process of surface composite fabrication and surface modification. To achieve this critical goal, the type of cooling and lubrication is of great importance. Therefore, in this paper, the cryogenic effects were investigated on FSP tool wear and surface quality of aluminum matrix nanocomposite. The silicon carbide (SiC) nanopowder was used as a reinforcing phase. The effects of cooling strategy and tool rotation speed on the tool wear, microhardness, surface roughness, and energy dispersive spectroscopy analysis (EDS) were studied due to the investigation of the effect of the parameters. The cooling procedure was in dry condition and cryogenic conditions. Also, the rotation speed was set in three levels, and other parameters were considered constant. The FSP tools were examined under a scanning electron microscope. Also, the wear mechanisms were investigated at different conditions. Results showed tool wear, surface roughness, and microhardness were improved in cryogenic conditions than in air conditions. Furthermore, with the presence of liquid nitrogen, metal matrix composite does not have any microstructure defects, such as micro-cracks. Also, energy dispersive spectroscopy analysis showed that SiC has suitable penetration in base material due to the existence of liquid nitrogen than dry conditions.

کلیدواژه‌ها

Friction stir processing (FSP)؛ Cryogenic؛ 7075 aluminum alloy؛ Tool wear؛ Surface quality