ECAP of recycled aluminium alloys

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ECAP of recycled aluminium alloys

• Przemyslaw Szczygiel

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Equal Channel Angular Pressing

• One of SPD methods
• No dimension change
• Refined microstructure
• Improved strength and retained ductility
• Simplicity of the process

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Research on ECAP

• Improved understanding of the process
• Modeling of deformation
• Microstructure evolution description
• Influence on properties
• Increase of efficiency of the process

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Investigated material

• Aluminium alloys with chemistry of recycled metal
  Al Si X
• Al Si 3 - Fe 0,45 - Mg 0,6
• Al Si 7 - Fe 0,7 - Mg 0,6
• Al Si 7 - Fe 0,7 - Mg 0,6 Cr, Mn, Zr, Cu

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Aim of the research

• Understanding of microstructure development in
  recycled Al-Si-X alloys during SPD
• Development of particle refinement model
• Description of phase transformations and dynamic
  precipitation in selected alloys
• Development of a super-strength Al-Si-X alloy

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What is being done

• Preparation of samples for experiment
• Homogenization
• Machining
• ECAP of the billets
• Route A
• Route Bc
• Preparation for microstructure examination

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Homogenization

• Heating
• From RT 540oC 100oC/h
• Holding
• In 540oC for 8h
• Cooling
• From 540oC RT 400oC/h

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Homogeneous zone

• Route A

• Route Bc

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Homogeneous zone

• Route A

• Route Bc

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Microstructure examination

• Optical microscopy
• Scanning Electron Microscopy/Electron Microprobe
  Analysis
• Differential Scanning Calorimetry
• Transmition Electron Microscopy
• Tensile testing

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What is being done

• Purchase of a new press
• 2nd axis actuator better control of the
  deformation
• Higher force
• Design of a new die for ECAP
• Possibility of using different curvatures of the
  outer corner
• Improved efficiency of the process

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Exams

• Two exams passed this semester
• Recrystallization and texture
• Electron microscopy
• Two exams this semester
• Modeling and simulation of material
  microstructure and properties
• Phase transformations and properties in Al X
  systems

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Thank you for attention