Microstructure modifications induced by a laser surface treatment in an AA7449 aluminium alloy

G. Fribourg, A. Deschamps, Y. Bréchet, G. Mylonas, G. Labeas, U. Heckenberger, M. Perez

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Abstract

This work investigates the modification of the precipitate microstructure induced by laser surface treatments in an AA7449 aluminium alloy in T7651 temper. Microhardness maps in the cross-section below the laser lines, as well as maps of the precipitate size and volume fraction obtained by Small-Angle X-ray Scattering, show that a significant precipitate dissolution and coarsening has been induced by the laser treatment. Integrated modelling is carried out to quantify this effect, including a thermal finite element model, a size class precipitation model and a precipitation hardening model. The precipitation model is calibrated using separate reversion experiments, and then coupled to the thermal and mechanical models, allowing a quantitative description of the modification of the microstructure.

Original languageEnglish
Pages (from-to)2736-2747
Number of pages12
JournalMaterials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume528
Issue number6
DOIs
Publication statusPublished - 15 Mar 2011
Externally publishedYes

Keywords

  • Al-Zn-Mg-Cu
  • Laser surface treatment
  • Modelling
  • Precipitation

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