Iranian Journal of Materials Science and Engineering

Abstract:

properties of AA6082 aluminum alloy. Considering that aging phenomenon affects the distribution of alloying element

in matrix, and the fact that different distribution of alloying elements has different impediments to dislocation

movement, a material model based on microstructure, has been developed in this research. A relative volume fraction

or mean radius of precipitations is introduced into the flow stress by using the appropriate relationships. The GA-based

optimization technique is used to evaluate the material constants within the equations from the uni-axial tensile test

data of AA6082 alloy. Finally, using the proposed model with optimized constants, the flow behavior of the alloy at

different conditions of heat treatment is predicted. The results predicted by the model showed a good agreement with

experimental data, indicating the capability of the model in prediction of the material flow behavior after different heat

treatment cycles. Also, the calculated flow stress was used for determination of the material property in Abaqus

Software to analyze the uniaxial compression test. The force- displacement curves of the analysis were compared to

the experimental data obtained in the same condition, and a good agreement was found between the two sets of results.