Influence of Mg content in Al alloys on processing characteristics and dynamically recrystallized microstructure of friction surfacing deposits

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Friction Surfacing (FS) coatings are deposited by severe plastic deformation at elevated temperatures (≈0.8*Tliquidus), requiring different process parameters for alloys of even small composition variations. For Al alloys it is known that with increasing Mg content the thermal softening rate decreases, i.e. the material retains higher flow strength under thermomechanical processing. Further, the stacking fault energy (SFE) decreases with increasing Mg content, which influences gliding characteristics of dislocations, and also deformation and recrystallization behavior. To elucidate the influence of such known properties on FS process parameters and resulting coatings, three Al alloys differing only in Mg content (0.27, 2 and 3.5 wt.%) were processed by FS in this study. Pronounced shear flow localization was observed for increasing Mg content, yielding thin and narrow coatings and requiring a reduction of process speeds. Further, the decrease in SFE with increasing Mg content resulted in lower recrystallized grain size and higher grain orientation differences, due to a lower tendency for dislocation annihilation by recovery.

Original languageEnglish
Article number141407
JournalMaterials Science and Engineering A
Publication statusPublished - 05.07.2021

Bibliographical note

The authors thank D. Valenta of University Duisburg-Essen for support during the EBSD measurements. The authors also thank A. Fischer of Max Planck Institute for Iron Research for discussions, tips, and support. The authors cordially thank Ahmet Karkar for his efforts and the Interdisciplinary Center for Analytics on the Nanoscale (ICAN) at University Duisburg-Essen for providing equipment for the TEM studies. The authors further thank Erbslöh Aluminium GmbH (WKW automotive group) for providing the Al alloys for this project. This project is funded by the Deutsche Forschungsgemeinschaft (DFG , German Research Foundation ) – project number: 323162991. The authors acknowledge the financial support by DFG .

    Research areas

  • Al–Mg-Alloys, Dynamic recrystallization, Friction surfacing, Shear strain rate, Stacking fault energy
  • Engineering