|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Characterization and Simulation of Microstructure Evolution of 7075 Aluminium Alloy during Homogenization
||Siamak Rafiezadeh, Ahmad Falahati, Ernst Kozeschnik
|On-Site Speaker (Planned)
In this study, the evolutions of primary and secondary phases in 7075 alloy during homogenization are investigated. Dominant primary phases of the as-cast microstructure consist of eutectic T-(AlZnMgCu), S-(Al2CuMg), Mg2Si and Fe-containing phases. It is found that T and S-phase gradually dissolve into the matrix by increasing temperature up to 485 °C. If these phases are not dissolved in the matrix during the homogenization, they can initiate cracks during subsequent processes. The small secondary Cr-dispersoids E-(Al18Mg3Cr2) are mainly nucleated at about 400°C at the center of the grains by increasing the temperature to 485°C, their radii increase and begin to coarsen. They act later as recrystallization inhibitor during deformation. Using the precipitation kinetics software MatCalc, the correlations between temperature and time during homogenization with other microstructural characteristics such as phase fraction, number density and mean radius of phases, are predicted. Predicted results are in excellent agreement with the experimental findings.
||Planned: Light Metals Volume