Hot Deformation Simulation of Spray Formed 7055 Aluminum Alloy

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The hot deformation behavior of spray formed 7055 aluminum alloy was investigated in this paper. Hot compression deformation was performed on Gleeble-3500 thermal-mechanical simulator at strain rate of 0.001-5s-1 and deformation temperature of 573-723K. The result shows that the flow stress of spray formed 7055 aluminum alloy is increased with the increasing of strain rates, while decreased with the increasing of the deforming temperature. The maximum temperature rising induced by deformation heat is 25K during the test at strain rate of 5s-1, and the corrected flow stress is 20MPa higher than measured value. A flow stress constitutive equation is constituted based on Arrhenius hyperbolic sine function containing the Z parameter, and the hot deformation activation energy is 146.91kJ·mol-1. The average absolute relative error (Er) is introduced to evaluate the performance of the developed constitutive equation. The value of Er is 2.89% , which proves the developed constitutive equation can accurately predict the flow stress of the spray formed 7055 aluminum alloy.

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