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Effect of Trace Elements on the Particle Size of Magnesium Silicide in Aluminium Extrusion: The Use of Thermo-Calc and DICTRA in order to Produce Aluminium more Efficiently
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2023 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This project is a feasibility study for Hydro Extrusion Sweden AB, a company that produces extruded aluminium profiles. The main purpose of this project was to analyse the difference of Mg2Si particle sizes in aluminium alloys when varying parameters, such as cooling rate and composition, in aluminium extrusion, particularly the EN AW 6082 alloy. The Mg2Si particles have a great impact on the product’s mechanical properties. This was done in order to investigate whether real-time process parameter control is possible or not. The main software used was Thermo-Calc and the add-on module DICTRA. Thermo-Calc was used to do equilibrium calculations and gather data for the alloy and its phases. Based on this information and data from Hydro, simulations in DICTRA could be performed. The results were then plotted with respect to time and radius. The findings indicate that the cooling rate significantly influences the particle size. As the process becomes more intricate and involves a greater number of trace elements, adjusting the cooling rate could potentially be employed as a means to address this issue. The results also showed that trace elements had a minimal effect on the particle size. However, this probably does not match the reality since other phases affect and block the growth of Mg2Si.The overall results indicate a positive outcome for using DICTRA in determining particle sizes. However, further research needs to be done in correlation with more experiments before this could be a viable research method for Hydro.

Abstract [sv]

Det här projektet är en förstudie för företaget Hydro Extrusion Sweden AB som producerar extruderade aluminiumprofiler. Det huvudsakliga syftet med projektet var att analysera skillnaden på Mg2Si-partiklarnas storlek i aluminiumlegeringar när olika parametrar som kylhastighet och sammansättning användes vid aluminiumextrudering, mer specifikt legeringen EN AW 6082. Mg2Si partiklarna har stor betydelse för produktens mekaniska egenskaper. Syftet med detta var att undersöka huruvida det är möjligt att styra process parametrarna i realtid. Mjukvaran som användes var Thermo-Calc och tilläggsmodulen DICTRA. Thermo-Calc användes för att göra jämviktsberäkningar och samla in data för legeringen samt dess faser. Baserat på denna information och data från Hydro kunde simuleringar i DICTRA utföras. Resultaten plottades sedan med avseende på tid och radie. Partikelstorleken påverkas avsevärt av kylningshastigheten enligt resultaten. I framtiden, när processen blir mer avancerad med fler spårämnen, kan det vara möjligt att justera kylningshastigheten för att hantera detta. Resultaten visade också att spårämnen hade en mycket liten effekt på partikelstorleken. Detta stämmer dock förmodligen inte med verkligheten eftersom andra faser påverkar och blockerar tillväxten av Mg2Si. De övergripande resultaten pekar på ett positivt resultat för att använda DICTRA för att bestämma partikelstorlekar. Ytterligare forskning måste göras i samband med fler experiment innan detta kan vara en genomförbar forskningsmetod för Hydro.

Place, publisher, year, edition, pages
2023. , p. 33
Series
TRITA-ITM-EX ; 2023:146
Keywords [en]
Thermo-Calc, DICTRA, simulations, EN AW 6082, extrusion, particle precipitation, Mg2Si, sustainable, trace elements, aluminium
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-331273OAI: oai:DiVA.org:kth-331273DiVA, id: diva2:1780855
External cooperation
Hydro Extrusion Sweden AB
Subject / course
Materials and Process Design
Educational program
Bachelor of Science
Supervisors
Examiners
Available from: 2023-08-22 Created: 2023-07-06 Last updated: 2023-08-22Bibliographically approved

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