Multi-field coupled rheological behavior and softening mechanism of 7075 aluminum alloy
Pulse current-assisted tensile experiments of 7075 aluminum alloy were carried out under the condition of strain rate of 0.01-10 s-1,current density of 18-27 A·mm-2 and temperature of 150-330℃.The effects of strain rate and current density on the mechani-cal properties of 7075 aluminum alloy were explored,and the modified Johnson-Cook constitutive model coupled with electrical parameters was derived and validated.New research ideas were provided for analyzing the coupling relationship among heat,electricity and force.The results show that compared with room temperature,well-distributed dimples with larger size appear in cross-section morphology of the en-ergized sample,and strain rate of 0.1-1 s-1 and current density of 21-24 A·mm-2 have significant effects on the reduction of the flow stress of 7075 aluminum alloy,which indicates that there is a threshold value for the effect of current density.And the modified Johnson-Cook model shows high reliability in prediction,and the model prediction is in high agreement with the experimental data,with correlation of 0.9961,and the average relative error is only 3.35%.
7075 aluminum alloyelectroplastic effectmulti-field couplingJohnson-Cook constitutive model
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