Thermal Deformation Characteristics and Dislocation Density Model Construction of Al-Cu-Li Alloy
The isothermal compression experiments of hot rolled Al-Cu-Li alloy at temperature range of 390～480℃and strain rate range of 0.01～1 s-1 were carried out on GLEEBLE-3500 isothermal simulator.The peak stress Arrhenius constitutive model was con-structed based on the isothermal compression flow stress data,and its average absolute relative error(AARE)is 4.612%.Based on the model,a dislocation density model of coupling temperature,strain rate,peak stress and peak strain was constructed based on K-M model and Taylor relationship,which has an AARE-value of 5.926%,indicating a high prediction precision.This model provides a reference for accurately describing the dislocation density evolution of Al-Cu-Li alloy during thermal deformation.
Al-Cu-Li alloythermal deformationconstitutive modeldislocation density model
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