The Deformation Behavior and Microstructure of Aluminum Alloy Al-6Mg-0.3Sc under Conditions of Hot Forming

An Al-6.25Mg-0.27Sc-0.46Mn-0.2Zn alloy has been tested after homogenization under uniaxial compression at temperatures of 200, 300, and 400 degrees C and at strain rates of 1, 10, and 20 s(-1). The stress-strain curves describing the deformation behavior of the alloy have been obtained. These curves show a substantial dependence of the yield stress on temperature, but low strain-rate sensitivity. The Zener-Hollomon parameter is calculated using three functions (the hyperbolic sine, power, and exponential functions). The value of the deformation activation energy, 239 kJ/mol, has been determined. The best results according to the agreement of calculation and experimental data are obtained for the exponential function, for which the error is not larger than 4%. The obtained model can be used for modeling the metal forming processes or selecting the temperature-deformation modes of treatment of alloys of the Al-Mg-Sc system.

Automated summary

The deformation behavior of an Al-6.25Mg-0.27Sc-0.46Mn-0.2Zn alloy was studied. It was found that the yield stress of the alloy is significantly dependent on temperature, but has low strain-rate sensitivity. The deformation activation energy of the alloy was determined and a suitable calculation model was identified.