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Multi-Step Hot Working of Al-5 wt.% Mg

  • Ingo Poschmann and Hugh J. McQueen
Published/Copyright: November 9, 2021
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 88 Issue 1

Abstract

Al-5 wt.% Mg samples were subjected to programmed torsion tests with temperature declining from 500 °C to 300 °C to investigate the deformation and restoration behaviour of the alloy during multi-stage hot working under non-isothermal conditions. The strong similarity between multi-step flow curves and isothermal reference tests led to the conclusion that the deformation of the alloy is dominated by interactions between dislocations and Mg atmospheres and less influenced by changes in the grain and subgrain structure. The deformation above 400 °C is characterised by temporary breakaways of the dislocations from the solute atoms. Below 400 °C, the mobility of the Mg atoms is strongly reduced and the breakaway becomes permanent.

Abstract

Das Verformungs- und Erholungsverhalten von Al-5 Gew.-% Mg im Verlaufe nichtisothermer Mehrschritt-Warmverformung wurde untersucht. Dazu wurde das Material programmierten Torsionsversuchen unterzogen, während derer die Temperatur von 500 °C auf 300 °C abnahm. Die starke Ähnlichkeit zwischen Mehrschritt-Versuchen und isothermen Vergleichstests führte zu der Schlußfolgerung, daß die Verformung der Legierung im wesentlichen von Versetzung-Fremdatom-Wechselwirkungen beeinflußt ist, und weniger von Änderungen in der Korn- und Subkornstruktur. Die Verformung oberhalb 400 °C ist dadurch charakterisiert, daß sich die Versetzungen temporär von den Mg-Wolken losreißen. Unterhalb 400 °C wird die Beweglichkeit der Versetzungen nach dem Losreißen unäbhängig von der der Fremdatome, da die Mobilität der Mg-Atome stark reduziert ist.

Ingo Poschmann VSG Verkehrstechnik GmbH Alleestr. 70, 44793 Bochum, Germany
Hugh J. McQueen Mechanical Engineering, Concordia University, 1455 de Maisonneuve Blvd. W, Montreal, P. Q., H3G 1M8, Canada

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Received: 1996-12-13
Published Online: 2021-11-09

© 1997 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Aufsätze
  5. Systematical Calculation of the Chemical Driving Force for Precipitation Reactions in Binary Alloys
  6. Thermodynamic and Kinetic Study of Diffusion Paths in the System Cu–Ag –Zn
  7. Multi-Step Hot Working of Al-5 wt.% Mg
  8. Young’s Modulus of Cast-Iron as a Function of Volume Content, Shape and Orientation of Graphite Inclusions
  9. Die Charakterisierung homogener polyedrischer Gefüge mit Hilfe des räumlichen Poisson-Voronoi-Mosaiks und der Vergleich zur DIN 50 601
  10. A Quasicrystal with Inflation Symmetry and no Forbidden Symmetry Axes in a Rapidly Solidified Mg–Al Alloy
  11. Internal Oxidation of Rapidly Solidified Cu–Zr Alloys
  12. Phase Diagram Investigation and Thermodynamic Evaluation of the Thallium–Tellurium System
  13. Thermodynamic Assessment of the Nb–W–C System
  14. Thermodynamic Properties of the Nb–W–C–N System
  15. Thermodynamic Properties of NiAs-Type Fe1+xSb
  16. Thermodynamic Properties of Alloys of Phosphorus with Calcium, Barium, Chromium, Manganese and Iron
  17. Phase Equilibria in the γ′-Rich Region of the Ni –Al –Hf System
  18. Phase Equilibria in the γ′-Rich Region of the Boron-doped Ni –Al –Hf System
  19. Instructions for Authors
  20. Zeitschrift für metallkunde
  21. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V
  22. Personen
  23. Bericht aus dem DGM-Fachausschuß Strangpressen
  24. Fortbildung
https://doi.org/10.3139/ijmr-1997-0004

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Aufsätze
  5. Systematical Calculation of the Chemical Driving Force for Precipitation Reactions in Binary Alloys
  6. Thermodynamic and Kinetic Study of Diffusion Paths in the System Cu–Ag –Zn
  7. Multi-Step Hot Working of Al-5 wt.% Mg
  8. Young’s Modulus of Cast-Iron as a Function of Volume Content, Shape and Orientation of Graphite Inclusions
  9. Die Charakterisierung homogener polyedrischer Gefüge mit Hilfe des räumlichen Poisson-Voronoi-Mosaiks und der Vergleich zur DIN 50 601
  10. A Quasicrystal with Inflation Symmetry and no Forbidden Symmetry Axes in a Rapidly Solidified Mg–Al Alloy
  11. Internal Oxidation of Rapidly Solidified Cu–Zr Alloys
  12. Phase Diagram Investigation and Thermodynamic Evaluation of the Thallium–Tellurium System
  13. Thermodynamic Assessment of the Nb–W–C System
  14. Thermodynamic Properties of the Nb–W–C–N System
  15. Thermodynamic Properties of NiAs-Type Fe1+xSb
  16. Thermodynamic Properties of Alloys of Phosphorus with Calcium, Barium, Chromium, Manganese and Iron
  17. Phase Equilibria in the γ′-Rich Region of the Ni –Al –Hf System
  18. Phase Equilibria in the γ′-Rich Region of the Boron-doped Ni –Al –Hf System
  19. Instructions for Authors
  20. Zeitschrift für metallkunde
  21. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V
  22. Personen
  23. Bericht aus dem DGM-Fachausschuß Strangpressen
  24. Fortbildung
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