Abstract
The plasticity flow behavior of 2A12 aluminum alloy under a wide range of temperatures ranging from 300°C to 450°C and strain rates ranging from 0.01s-1 to 1s-1 was studied by isothermal hot compression testing. The plastic behavior shows a peak stress in stress strain curve. At the beginning stage of deformation, the stress increases with strain rapidly, then flow stress decreases showing softening characteristics. The results show that the peak stress increases with the strain rate showing rate hardening, while decreases with the temperature showing heat softening. The strain flow stress curve was modeled by a novel function which consist an exponential and linear term with hardening coefficient, peak stress and softening modulus. The coupling effect of strain rate and temperature on the peak stress was studied by an Arrhenius-type equation. The effect of strain rate and temperature on hardening coefficient, peak stress and softening modulus was discussed and modeled by linear equations.
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