Effect of thermo-mechanical conditions during constrained friction processing on the particle refinement of AM50 Mg-alloy phases

Research output: Journal contributionsJournal articlesResearchpeer-review

Authors

Constrained Friction Processing (CFP) is a novel solid-state processing technique suitable for lightweight materials, such Mg- and Al-alloys. The technique enables grain size refinement to fine or even ultrafine scale. In this study, the effect of CFP on the microstructural refinement of AM50 rods is investigated in terms of particle size and morphology of the eutectic and secondary phases originally present in the base material, in particular the eutectic β-Mg17Al12 and Al-Mn phases. For that purpose, as-cast and solution heat-treated base material and processed samples were analyzed. The Al8Mn5 intermetallic phase was identified as the main secondary phase present in all samples before and after the processing. A notorious refinement of these particles was observed, starting from particles with an average equivalent length of a few micrometers to around 560 nm after the processing. The refinement of the secondary phase refinement is attributed to a mechanism analogous to the attrition comminution, where the combination of temperature increase and shearing of the material enables the continuous breaking of the brittle intermetallic particles into smaller pieces. As for the eutectic phase, the results indicate the presence of the partially divorced β-Mg17Al12 particles exclusively in the as-cast base material, indicating that no further phase transformations regarding the eutectic phase, such as dynamic precipitation, occurred after the CFP. In the case of the processed as-cast material analyzed after the CFP, the thermal energy generated during the processing led to temperature values above the solvus limit of the eutectic phase, which associated with the mechanical breakage of the particles, enabled the complete dissolution of this phase. Therefore, CFP was successfully demonstrated to promote an extensive microstructure refinement in multiple aspects, in terms of grain sizes of the α-Mg phase and presence and morphology of the Al-Mn and eutectic β-Mg17Al12.

Original languageEnglish
JournalJournal of Magnesium and Alloys
Volume12
Issue number6
Pages (from-to)2298-2311
Number of pages14
ISSN2213-9567
DOIs
Publication statusPublished - 06.2024

Bibliographical note

Publisher Copyright:
© 2024

    Research areas

  • Al-Mn phases, AM50, Constrained friction processing, Extrusion, Refill friction stir spot welding, β-MgAl
  • Engineering

Recently viewed

Publications

  1. A PD regulator to minimize noise effect using a minimal variance method for soft landing control of an electromagnetic valve actuator
  2. (How) Can didactic research find its way into the classroom? Results from a questionnaire survey on the lesson preparation and continuing professional development of German teachers
  3. Trans pixelate substitution scheme for denoising computed tomography images towards high diagnosis accuracy
  4. To settle or protect? A global analysis of net primary production in parks and urban areas
  5. Integration of demand forecasts in ABC-XYZ analysis
  6. Atomare Hinterlassenschaften
  7. Time use research and time use data - actual topics and new frontiers
  8. Berufsidentität
  9. Giving is a question of time: response times and contributions to an environmental public good
  10. Against and with the silence: Language, relations, and methods in qualitative research on pregnancy loss and perinatal bereavement
  11. Openness as a factor underlying successful expatriation: A brief report of project iGOES
  12. The new European database for chemicals of concern
  13. The Interaction of Global Value Chains and Rural Livelihoods
  14. Differenzen in der pädagogischen Praxis
  15. Transferring biodiversity-ecosystem function research to the management of ‘real-world’ ecosystems
  16. Does it take two to Tango?
  17. Global warming will affect the genetic diversity and uniqueness of Lycaena helle populations
  18. Learning to spend time in unusual times
  19. Complementary biomass strategy
  20. On the last mile
  21. Realist Inquiry
  22. Lekcja 29-30
  23. Institutionalisierung der erziehungswissenschaftlichen Lehrerausbildung
  24. Befremden in der Kunstvermittlung
  25. Spatial imaginaries in flood risk management: insights from a managed retreat initiative in upper Bavaria
  26. Active on many foreign markets.
  27. Scale in environmental governance: moving from concepts and cases to consolidation
  28. Zur Mikrostruktur des Exportbooms
  29. Einleitung
  30. Whatever we negotiate is not what I like
  31. Measurement of vapor pressures of selected PBDEs, hexabromobenzene, and 1,2-bis(2,4,6-tribromophenoxy)ethane at elevated temperatures