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TESTING AND IMPROVEMENT OF EXTRUDABILITY FOR PRIMARY EQUIVALENT RECYCLED ALUMINIUM

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The Extrudability of Primary Equivalent Recycled Aluminium (PERAl) has been investigated. Utilizing High Temperature Deformation Simulation (HTDS) constitutive models have been proposed that describe the hot working characteristics of Aluminium alloys for both transient and steady state deformation. A series of experimental Aluminium-Magnesium-Silicon alloys were produced to study the influence of metallurgical state on high temperature deformation for both torsion and extrusion. These alloys were based on commercial pure and 99.999% purity Aluminium. All alloys were tested for cleanliness using purpose built cleanliness tester. From the laboratory scale casting and extrusion programme of "full-scale" industrial casting and extrusion was performed. The use of specially designed dies permitted the measurement of extrusion parameters hitherto not possible on an industrial scale extrusion plant. The programme established the complex inter-relation of all factors affecting extrudability and proposes the use of "Extrudability Matrix".

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