Abstract
2219 aluminum alloy is a kind of high-strength Al-Cu-Mn alloy that can be strengthened by heat treatment. Its mechanical property parameters and forming properties are greatly affected by the deformation rate, temperature and strain. Taking 2219 aluminum alloy extruded bar as the research object, the Gleeble-3500 thermomechanical simulator was used to analyze the thermal compression deformation behavior of 2219 aluminum alloy under different temperatures and strain rates. The results show that the deformation behavior of 2219 aluminum alloy under high temperatures is greatly influenced by the deformation temperature and strain rate, and the flow stress is the result of high-temperature softening, strain hardening and deformation rate hardening. According to the experiment results, the Arrhenius constitutive model and the exponential constitutive model considering the influence of temperature and strain rate, respectively, were established, and the predicted results of the two constitutive models were in good agreement with the test results. On this basis, the processing map of 2219 aluminum alloy was established. Under the same strain rate condition with an increase of the deformation temperature, the power dissipation efficiency increases gradually, and the driving force of 2219 aluminum alloy to change its microstructure increases gradually. At the same deformation temperature, the lower the strain rate, the less possibility of plastic instability.
Highlights
With the development of industrial technology, aluminum alloy, as a lightweight structural material, has been widely used in the aerospace and automobile manufacturing industries. 2219 aluminum alloy is a kind of heat-treatable strengthening Al-Cu-Mn alloy that has good mechanical properties [1] and welding properties [2] in both high and low temperatures, and is widely used in the production of various structural parts in the fields of aviation and aerospace [3]
The research results showed that the corrosion behavior promoted the initiation of fatigue cracks, and the selection of reasonable heat treatment conditions to improve the corrosion resistance of 2219 aluminum alloy has a positive significance for improving its fatigue performance
According to the characteristics the flow stress curve, it can be seen that under the high temperature conditions, the deformation behavior of 2219 aluminum alloy was greatly influenced by the temperature and deformation rates, and the flow stress is the result of the coordinated action of high temperature softening, strain hardening and deformation rate hardening
Summary
With the development of industrial technology, aluminum alloy, as a lightweight structural material, has been widely used in the aerospace and automobile manufacturing industries. 2219 aluminum alloy is a kind of heat-treatable strengthening Al-Cu-Mn alloy that has good mechanical properties [1] and welding properties [2] in both high and low temperatures, and is widely used in the production of various structural parts in the fields of aviation and aerospace [3]. This paper takes 2219 aluminum alloy as the research object, and the deformation behavior of 2219 aluminum alloy was studied through a thermal compression test under different temperature and strain rate conditions so as to obtain the mechanical properties of 2219 aluminum alloy under different deformation conditions. On this basis, the processing map of 2219 aluminum alloy was studied, to provide a theoretical basis for the formulation and optimization of the thermal processing technology of 2219 aluminum alloy
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