THERMAL-DEFORMATION MODEL OF A Sr-MODIFIED A356 ALUMINUM ALLOY

The hot-deformation behavior of A356 aluminum alloy with a Sr modification was investigated using Gleeble 1500 thermal simulator. true stress-strain curves deformation temperature 300–500 °C and strain rate 0.01–5 s–1 were clarified. activation energy the 221.474 kJ/mol. influences friction on investigated, then constitutive equation established. results show that flow stress is obviously affected by rate. experimental lower than theoretical stress, difference between increases increasing strain. maximum reaches 17.8 MPa when sample deformed at 300 °C/5 reduction 16 %. For all conditions correlation coefficient 0.99 average relative error 4.8 %, which shows good predictability current model. developed can provide guidance for study similar alloys.