Uncovering Technological and Environmental Potentials of Aluminum Alloy Scraps Recycling Through Friction Stir Consolidation

다국어 초록 (Multilingual Abstract)

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.

참고문헌 (Reference)

1 Widerøe, F., "Using contrast material techniques to determine metal flow in screw extrusion of aluminium" 213 : 1007-1018, 2013

2 Worrell, E., "The role of material effi ciency in environmental stewardship" 41 : 575-598, 2016

3 Gutowski, T. G., "The energy required to produce materials: constraints on energyintensity improvements, parameters of demand" 2013

4 Paraskevas, D., "Spark plasma sintering as a solid-state recycling technique : the case of aluminum alloy scrap consolidation" 7 : 5664-5687, 2014

5 Chiba, R., "Solid-state recycling of aluminium alloy swarf through cold profi le extrusion and cold rolling" 211 : 1878-1887, 2011

6 Wan, B., "Review of solid state recycling of aluminum chips" 125 : 37-47, 2017

7 Behrens, B. A., "Reprocessing of aluminum chips by hot backward extrusion" 10 : 375-382, 2016

8 이춘만, "Remanufacturing: Trends and Issues" 한국정밀공학회 4 (4): 113-125, 2017

9 Buchner, H., "Potential recycling constraints due to future supply and demand of wrought and cast Al scrap—A closed system perspective on Austria" 122 : 135-142, 2017

10 Cooper, D. R., "Metal recovery during melting of extruded machining chips" 200 : 282-292, 2018

11 Ingarao, G., "Manufacturing strategies for effi ciency in energy and resources use : the role of metal shaping processes" 142 : 2872-2886, 2017

12 Baff ari, D., "Infl uence of processing parameters and initial temper on Friction Stir Extrusion of 2050 aluminum alloy" 28 : 319-325, 2017

13 Misiolek, W. Z, "High quality extrudates from aluminum chips by new billet compaction and deformation routes" 61 : 239-242, 2012

14 Li, X., "Friction stir consolidation of aluminum machining chips" 94 : 2031-2042, 2018

15 Kore, A. S., "Formability of aluminium sheets manufactured by solid state recycling" 2017

16 김동혁, "Evaluation of Microstructure and Mechanical Properties on Solution Heat Treatment of Recycled A319 Cutting Chip" 한국정밀공학회 5 (5): 427-433, 2018

17 Stotz, P. M., "Environmental screening of novel technologies to increase material circularity: a case study on aluminium cans" 127 : 96-106, 2017

18 EAA, "Environmental profi le report for the european aluminium industry april 2013- data for the year 2010 life cycle inventory data for aluminium production and transformation processes in Europe" 2013

19 Dufl ou, J. R., "Environmental assessment of solid state recycling routes for aluminium alloys: can solid state processes signifi cantly reduce the environmental impact of aluminium recycling?" 64 : 37-40, 2015

20 Güley, V., "Eff ect of die design on the welding quality during solid state recycling of AA6060chips by hot extrusion" 574 : 163-175, 2013

21 이춘만, "Eco-Friendly Technology for Recycling of Cutting Fluids and Metal Chips: A Review" 한국정밀공학회 4 (4): 457-468, 2017

22 Tolio, T., "Design, management and control of demanufacturing and remanufacturing systems" 66 : 585-609, 2017

23 Granta Design Limited, "CES Selector"

24 Milford, R. L., "Assessing the potential of yield improvements, through process scrap reduction, for energy and CO2 abatement in the steel and aluminium sectors" 55 : 1185-1195, 2011