Work hardening of heattreatable Alalloys

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Work hardening of heat-treatable Al-alloys

• Professor Erik Nes
• Post doc Øyvind Ryen
• Professor Knut Marthinsen
• Professor Øystein Grong
• Post doc Bjørn Holmedal
• Post doc Jesper Friis
• Professor Magnus Langseth
• Trond Furu, Hydro Sunndalsøra
• Ole Runar Myhr, Hydro Raufoss

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Purpose

• Further development of a model for work hardening
• Heat-treatable Al-alloys (AA6xxx, 7xxx)
• Coupling of
• a model for precipitation, NAMO (Grong, Myhr)
• with a model for work hardening, ALFLOW (Nes,
  Marthinsen, Holmedal)
• Prediction of material behaviour in crash

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ALFLOW a bridge between continuum and
microstructure.
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recovery
storage
Changes in microstructure
? , Shear strain
Critical resolved shear stress
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Model predictions
Tensile testing
Large strain deformation, cold rolling
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Marciniak-Kuczynski theory
EXPERIMENTAL AND PREDICTED YL FOR AA3103-0
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AA3103-O
ALFLOW FEM (Yld89)
ALFLOW texture M-K
(IFU/Hydro)
(IFU)
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Plans for the next two years

• Experimental work
• mechanical testing
• microstructural characterisation SEM, TEM
• Correlation of mechanical properties and
  dislocation structures
• effect of different precipitates on dislocation
  structure
• shearable/ non-shearable precipitates
• Input to modelling