Feature of flow stress of aluminum sheet used for can during hot compression

摘要

The flow stress feature of aluminum sheet used for pressure can during plastic deformation at elevated tem- perature was studied by isothermal compressionn test using Gleeble 1 500 dynamic materials testing machine. The experi- mental results show that the steady state deformation is remarkable when the material is deformed in the temperature range of 350 ～ 500deg.C at strain rates within the range of 10~-2 ～ 2 ～ 10.0 s~-1. The material is sensitive to positive strain rate. A hyperboic sine relationship is found to correlate well the flow stress with the strain rate, and an Arrhenius relationship with the temperature. Semi-empirical constitutive equations of the flow stress are derived from all experimental data for tested material during plastic deformation at elevated temperature by polyelement linear regression analysis.