| Abstrakt: |
In addition to temperature, strain rate and strain effects, microstructure evolution might be considered in hot plastic constitutive relation for deformation behavior characterization of high strength aluminum alloys in hot forming processes. Constitutive relation researches of high strength aluminum alloys in hot plastic deformation were summarized. The research results show that the widely applied phenomenal constitutive models may couple the effects of strain, temperature and strain rate by modifying model parameters and provide accurate prediction for the flow stresses. However, the phenomenal constitutive model prediction accuracy might not be guaranteed under the wide ranges of temperature and strain rate or out of the experimental scopes due to lacks of explanation on the deformation mechanism. The physical based constitutive models may calculate the flow stresses based on modeling the microstructural deformation behaviors such as dislocation density, grain size and dynamic recrystallization, which shows great ability in predicting both of macro and micro behaviors. Thus, this is the research trend of the constitutive relation for high strength aluminum alloys in hot plastic deformation. [ABSTRACT FROM AUTHOR] |
