Zerilli-Armstrong constitutive model of δ phase-aged GH4169 alloy and its parameters inversion method
The high-temperature compression experiments of δ-phase aged GH4169 alloy was carried out on Gleeble-1500D thermal simu-lation testing machine.The experiments temperature was 950-1040℃and the strain rate was 0.005-1 s-1.To establish the constitutive model that can accurately describe the flow behavior of the alloy,the influence of strain on the material parameters of the Zerilli-Armstrong constitutive model was considered.A parameter inversion method based on the multi-island genetic algorithm was proposed and adopted to establish the Zerilli-Armstrong constitutive model of the material considering strain compensation.With the help of standard statistical pa-rameters such as correlation coefficient and average absolute relative error,the prediction accuracy of the constitutive model was quantita-tively evaluated.The results show that the Zerilli-Armstrong constitutive model considering strain compensation has high prediction accura-cy,and its correlation coefficient and average absolute relative error are 0.996 and 3.189%,respectively.
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