Tension and compression creep aging asymmetry of a pre-treated Al-Zn-Mg-Cu alloy

Abstract

The asymmetric creep aging behaviors of a pre-treated Al-Zn-Mg-Cu alloy under high and low stresses have been investigated for high precision creep age forming application of aluminum integral panels. With the increase of applied stress, the creep strains under the tensile stresses are higher than those of compressive stresses and the asymmetry of creep strain is more obvious. However, the mechanical properties of tensile stress creep aged samples are lower than those of compressive stress creep aged samples. Dislocation density, dislocation moving velocity and the proportion of precipitates directly lead to the asymmetry of creep strain and mechanical properties after tensile-compressive creep aging process. In addition, the tensile and compressive stresses have little effect on the width of the precipitate-free zone (PFZ). It indicates that in the high stress creep age forming process of the pretreated Al-Zn-Mg-Cu alloy, the tensile stress promotes the dislocation motion to obtain a better creep strain but weakens its mechanical properties compared with the compressive stress. In the field of civil aviation aircraft component manufacturing, the introduction of tension and compression stress asymmetry into the creep constitutive model may improve the accuracy of creep age forming components.

Keywords

Al-Zn-Mg-Cu alloy / mechanical properties / creep ageing / tension and compression asymmetry / dislocation density

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