Temperature and Strain Rate Effects on the Dynamic Strain Ageing of Aluminium Alloy AA7030

Magnus Hörnqvist; Birger Karlsson

doi:10.4028/www.scientific.net/MSF.519-521.883

Paper Titles

Influence of Iron Content on the Mechanical Properties of AA6016 Alloy Sheet
p.859

Nonuniform Temperature Distribution in Adiabatic Shear Band Using Measured Shear Stress-Shear Strain Curve in Torsion of Thin-Walled Tube Aluminium Alloy Specimen and Gradient-Dependent Plasticity
p.865

Influence of Scandium Addition on the High Temperature Compressive Strength of Aluminium Alloy 7010
p.871

An Analysis of Microband Orientation in Hot Deformed Aluminium Alloy AA5052 Using Forward and Reverse Torsion
p.877

Temperature and Strain Rate Effects on the Dynamic Strain Ageing of Aluminium Alloy AA7030
p.883

Experimental and Numerical Study in Denting Resistance of 6111-T4 Aluminium Alloy
p.889

Effect of Microstructure on Crack of Al-Mg-Si Alloy Extrusions during Axial Compression
p.895

Effect of Artificial Aging Temper on the Microstructure and Properties of 7B04 Pre-Stretched Thick Plate
p.901

Boss Formability of Nano-Structured Aluminium Alloys at Elevated Temperatures
p.907

HomeMaterials Science ForumMaterials Science Forum Vols. 519-521Temperature and Strain Rate Effects on the Dynamic...

Temperature and Strain Rate Effects on the Dynamic Strain Ageing of Aluminium Alloy AA7030

Abstract:

The effects of temperature and strain rate on the mechanical properties of aluminium alloy AA7030 (Al-5.4Zn-1.2Mg) in naturally aged and peak aged condition are investigated, with emphasis on the relation to dynamic strain ageing. It is found that the naturally aged material shows more severe signs of dynamic strain ageing, including inverse strain rate and temperature dependence of flow stress, inverse temperature dependence of the ductility and serrated yielding. The peak aged material also shows signs of dynamic strain ageing, but to a lesser extent, most pronounced through serrated yielding. The observed effects can be qualitatively explained in terms of a thermal activation based model for dislocation glide. Furthermore, inhomogeneous deformation is observed on several size scales ranging from localized glide bands to surface deformation effects (orange peel surface) and macroscopic flow localization in shear bands.