Evolution of activation energy during hot deformation of AA7150 aluminum alloy

Effects of temperature and strain rate during hot compression of manganese aluminum bronze

“…After dynamic softening had taken place, it led to an offset of work hardening effect. In other words, flow stresses decreased monotonically to higher strain because the effect of work hardening could be partially neutralized by the occurrence of dynamic softening mechanisms [8][9]. At last, the flow stresses, that gradually decreased, approached a steady state because of dynamic recrystallization during hot deformation [10].…”

“…Extensive investigations according to dynamic recovery and dynamic recrystallization of alloys have been focused on the study of flow stress behavior under different deformation condition and microstructure evolutions by optical microscope [6][7][8][9][10][11][12]. Most recent works analyzed correlations between developed microstructures and stress-strain responses.…”

The Hot Deformation Activation Energy of 7050 Aluminum Alloy under Three Different Deformation Modes

“…Therefore, the hot deformation activation energy will vary with these deformation conditions. From Equation (2), in which the activation energy is temperature and strain rate dependent [11], the activation energy, Q2v, under different deformation conditions were calculated. The results are listed in Table 3.…”

“…Recently, Zhang et al [10] found that the hot deformation activation energy of Ti-15-3 titanium alloy increases with increasing temperature and decreasing strain rate. Shi et al [11] found that the hot deformation activation energy of an AA7150 aluminum alloy is not constant and decreases with increasing deformation temperature and strain rate. Therefore, a modified constitutive equation was proposed, wherein the term for activation energy is treated as a variant involving temperature and strain rate.…”

A comparative study on the phenomenological and artificial neural network models to predict hot deformation behavior of AlCuMgPb alloy

“…This complexity of deformation behavior, however, leads to the expectation that deformation can only be accurately calculated with the aid of computer code to model the material's response under the specified loading conditions. For this purpose, constitutive equation is often used to represent flow behaviors of materials in a form that can be used in computer code to model and simulate the mechanical behavior of materials and deformation processes under the prevailing loading conditions [7][8][9][10][11][12][13]. In order to obtain the reliable simulation results, it is necessary an accurate model that can correctly describe the relationship between flow stress and processing parameters.…”