Microstructure and vacancy-type defects in high-pressure torsion deformed Al-Cu-Mg-Mn alloy

作者：Lechner W; Puff W; Mingler B; Zehetbauer M J; Wuerschum R^*

来源：Scripta Materialia, 2009, 61(4): 383-386.

DOI：10.1016/j.scriptamat.2009.04.027

• Severe plastic deformation
• High-pressure torsion
• Positron annihilation
• Aluminium alloys
• Lattice defects

High-pressure torsion (HPT) was applied to the structural refinement of an age-hardenable Al-Cu-Mg-Mn alloy (AW 2017). HPT deformation gives rise to a fragmentation and dissolution of aging-induced precipitates and to a grain refinement down to sizes of 100 mu. Positron annihilation spectroscopy, in particular the chemical sensitive method of two-dimensional Doppler broadening spectroscopy, was used for a detailed analysis of the nature of vacancy-type defects induced by deformation and vacancy-solute interaction. The correlation between microstructure and atomic defects with thermal annealing is discussed.

• 出版日期2009-8