Changes in processing characteristics and microstructural evolution during friction extrusion of aluminum

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This study focuses on characterizing the microstructural evolution of the aluminum alloy 7075 in the friction extrusion process under different extrusion forces and die angles. Depending on these conditions, two fundamentally different extrusion types are found, showing significant differences in the process characteristics and microstructural evolution. One of the two extrusion types is associated with high extrusion force and low die angle, leading to fully recrystallized wires with average grain size around 1.2 μ m. The microstructural analysis indicates that the microstructure present in the wires is generated in the charge material by the combination of tool geometry, load induced material flow and friction conditions in the initial stages of the friction extrusion process. The identified processing conditions and influencing factors introduce an alternative route for friction extrusion at low extrusion ratios, capable of producing completely refined wires.

Original languageEnglish
Article number24
JournalInternational Journal of Material Forming
Issue number3
Number of pages14
Publication statusPublished - 01.05.2022

Bibliographical note

Open Access funding enabled and organized by Projekt DEAL. B. Klusemann acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 101001567).

    Research areas

  • Aluminum alloy, Dynamic recrystallization, Friction extrusion, Mechanical properties, Solid state processing, Ultra-fine grains
  • Engineering