Thermal Efficiency and Material Properties of Friction Stir Channelling Applied to Aluminium Alloy AA5083

Heikki Karvinen, Afshin Hasani Aleni, Pauli Salminen, Tatiana Minav and Pedro Vilaça
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Heikki Karvinen: Department of Mechanical Engineering, School of Engineering, Aalto University, 02150 Espoo, Finland
Afshin Hasani Aleni: Department of Mechanical Engineering, School of Engineering, Aalto University, 02150 Espoo, Finland
Pauli Salminen: Department of Mechanical Engineering, School of Engineering, Aalto University, 02150 Espoo, Finland
Tatiana Minav: Department of Mechanical Engineering, School of Engineering, Aalto University, 02150 Espoo, Finland
Pedro Vilaça: Department of Mechanical Engineering, School of Engineering, Aalto University, 02150 Espoo, Finland

Energies, 2019, vol. 12, issue 8, 1-16

Abstract: The Friction Stir Channelling (FSC) is a novel advanced solution for producing internal closed channels along any desired path with a constant or continuously modified shape along the path in a single manufacturing step. The channels are formed by continuous extraction of part of the stirred processed material into external flash. In this work, the performance of channels with the same shape and dimensions but produced by FSC and milling respectively, are compared using an experimental calorimeter setup with a focus on the influence of the geometrical features of the channels on the thermal efficiency. The investigation is implemented in a plate of AA5083-H111, with a thickness of 10 mm. The material properties of the channels produced by FSC are investigated with a microhardness field and optical microscopic analysis, assessing the thermomechanically processed and heat affected zones. The mechanical resistance of the channels produced by FSC is evaluated with an application of internal pressure up to 380 bar. The results show that the FSC enhanced the heat transfer by about 45 % compared with smoother milled channels. The optical microscopy shows evidence of a good consolidation of the solid state joining mechanisms activated during the FSC, with a small reduction of the hardness around the channel in the stirred zone and heat affected zone, being assisted by a harder top region at the ceiling of the channel.

Keywords: Friction stir channelling; cooling plate; thermal efficiency; microstructure; microhardness; internal pressure; AA5083; thermal management (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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