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Gianluca Buffa,Dario Baffari,Giuseppe Ingarao,Livan Fratini 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.5
Conventional metal chips recycling processes are energy-intensive with low efficiency and permanent material losses during re-melting. Solid state recycling allows direct recycling of metal scraps into semi-finished products. It is expected that this process category would lower the environmental performance of metals recycling. Friction Stir Consolidation is a new solidstate technique taking advantage of friction heat generation and severe plastic deformation to consolidate chips into billets. In this research, the feasibility of Friction Stir Consolidation as aluminum chips recycling process is analyzed. Specifically, an experimental campaign has been carried out with varying main process parameters. Three main aspects have been evaluated in order to highlight products quality and environmental impact of the process: (i) metallurgical and mechanical properties of the consolidated products; (ii) primary energy demand, as compared to conventional processes; (iii) forgeability of the consolidated products, as compared to parent material. Results revealed that a proper process parameters selection results in fully consolidated aluminum disk with satisfactory mechanical properties. Also, the new recycling strategy allows substantial energy savings with respect the conventional (remelting based) route.
Properties Augmentation of Cast Hypereutectic Al–Si Alloy Through Friction Stir Processing
William P. Bates,Vivek Patel,Harikrishna Rana,Joel Andersson,Jeroen De Backer,Mattias Igestrand,Livan Fratini 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.1
The present endeavour is to augment mechanical attributes via friction stir processing (FSP) in hypereutectic aluminium–siliconcastings by the means of microstructural modifications and defects reduction. Wherein, the study proceeds with mainlytwo approaches namely, alteration in tool revolution (TR) and the number of FSP passes. The prepared specimens wereevaluated investigating volume fraction of porosities, microstructural characterizations and microhardness. Therefrom, thespecimen with highest number of passes delivered most uniform properties resulting from the reduction in casting porositiesand refined silicon particle uniform distribution throughout friction stir processed zone. This endeavour may be consideredas a footstep towards more industrial readied material transformation.