Research on Deformation Behavior of Pure Tantalum in Forging State during Compression Process
The deformation characteristics of forged pure tantalum were studied using a Gleeble-3800 thermal simulation testing machine in the temperature range of room temperature to 350 ℃,strain rate range of 0.1～10 s-1,and maximum deformation of 60％.According to the true stress-strain curve obtained from the experiment,it can be observed that the deformation resistance increases with the decrease of deformation temperature and the increase of strain rate before reaching the peak stress.After reaching the peak stress,there exists a deformation mechanism dominated by dynamic recovery.Based on the flow stress-strain curve of the material,the deformation activation energy Q and stress index n of the material were further calculated to be 36.52 kJ/mol and 25.92,respectively,and a constitutive equation was constructed to describe the rheological behavior.
forged pure tantalumconstitutive equationrheological behavior
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