Abstract
The creep-ageing behaviour of a peak-aged aluminium alloy 7050 was investigated under different stress levels at 174 ∘C for up to 8 h. Interrupted creep tests and tensile tests were performed to investigate the influences of creep-ageing time and applied stress on yield strength. The mechanical testing results indicate that the material exhibits an over-ageing behaviour which increases with the applied stress level during creep-ageing. As creep-ageing time approaches 8 h, the material's yield strength under different stress levels gradually converge, which suggests that the difference in mechanical properties under different stress conditions can be minimised. This feature can be advantageous in creep-age forming to the formed components such that uniformed mechanical properties across part area can be achieved. A set of constitutive equations was calibrated using the mechanical test results and the alloy-specific material constants were obtained. A good agreement is observed between the experimental and calibrated results.
Highlights
Creep-age forming (CAF) is a state-of-the-art metal processing method that combines age hardening and inelastic deformation
Interrupted creep tests and tensile tests were performed to investigate the influences of creep-ageing time and applied stress on yield strength
As creep-ageing time approaches 8 h, the material’s yield strength under different stress levels gradually converge, which suggests that the difference in mechanical properties under different stress conditions can be minimised
Summary
Creep-age forming (CAF) is a state-of-the-art metal processing method that combines age hardening and inelastic deformation. CAF plays a pivotal role in manufacturing lightweight and large pieces, such as the wing panels of airplanes and aluminium panels used in aerospace applications. The deformation process in CAF is primarily based on the creep phenomenon deliberately induced during the age/precipitation hardening process [1]. 7000-series aluminium alloys are widely applied in the aerospace industries due to its good strengthto-weight ratio [2]. The strength of these alloys are generally attributed to the fine and uniformly dispersed precipitates formed during the artificial ageing process [3].
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