7150 Aluminum is currently one of the Al-Zn-Mg-Cu aluminum alloys most widely used in the aviation industry. In addition to high strength, the alloy also has high fracture toughness, good corrosion resistance, and excellent fatigue resistance.
In order to study the hot workability and characteristics of 7150 aluminum alloy, it is necessary to study its hot deformation behavior. The flow stress of metal thermal deformation is the manifestation of the thermal deformation mechanical properties of the material at high temperature, and it is the most basic quantity to characterize the thermal deformation performance of the metal.
In the actual plastic deformation process, the flow stress value of the material determines the load and the energy consumed during deformation. It is not only related to the material composition, but also related to parameters such as deformation temperature, deformation degree, and strain rate. It is also a comprehensive reflection of the evolution of the microstructure of the material during thermal deformation.
When the deformation of 7150 aluminum sheet is 75%, the strength of the alloy is the highest; when the deformation is 60%, the sensitivity of intergranular corrosion and exfoliation corrosion is the lowest.
The degree of recrystallization increases with the amount of deformation, which leads to the decrease of the alloy's resistance to intergranular corrosion. When the degree of alloy deformation is 75%, the overall performance of 7150 aluminum plate is the best.
Its general change of flow stress s shown as follows: at the beginning of deformation, flow stress rises rapidly with the increase of true strain, and then gradually decreases after the peak appears, showing the characteristics of rheological softening until it remains basically constant. At this time, work hardening and rheological softening reach a balance.
Original Source:https://www.aircraftaluminium.com/a/hot-deformation-behavior-of-7150-aluminum-alloy.html
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