Mechanical Description and Hardening Characteristic of Tensile Deformation of AA5083 at 525 degrees C

作者：Xu Xuefeng^*; Tong Guoquan; Gao Lin; Men Xiangnan

来源：Rare Metal Materials and Engineering, 2010, 39: 195-199.

• AA5083
• strain harden
• strain rate hardening
• flow stress
• constitutive equation

The flow behavior of AA5083 at the strain rate ranging from 0.0008 to 0.032 s(-1) and 525 degrees C was studied by constant-strain-rate tensile tests. The measuring methods on strain hardening exponent and strain rate sensitivity index were discussed and a constitutive equation using up-dated viscoplasticity equation was established. The results show that the tensile flow stress of AA5083 increases with enhancing strain rate under this tensile condition, showing strain rate hardening. All of the tensile curves illustrate three stages of strain hardening, steady-state and strain softening. Strain hardening exponent increases with reducing the strain rate and the strain rate sensitivity index decreases with increasing the strain, caused by dynamic grain growth. Strain softening is induced by continuous dynamic recrystallization. Good agreement is obtained between predicted and experimental flow stress.

• 出版日期2010-6
• 单位南京航空航天大学