Abstract: In order to study the hot deformation behavior of Mg-10Gd-3Y-0.6Zr-1Ag(Mg-Gd-Y) magnesium alloy, the hot compression test is carried out on MMS-200 hot compression simulation test machine. The parameters of the hot compression test are as follows: At 623 K, 673 K, 723 K, 773 K, and strain rates 0.001 s^-1, 0.01 s^-1, 0.1 s^-1, 1 s^-1, the true stress-true strain curve of thermal compression is analyzed, The constitutive equation of flow stress of the alloy is constructed, and the hot processing map under peak stress is established, The recrystallization and texture evolution of the alloy after hot deformation are analyzed by electron backscatter diffraction(EBSD) technique. The results show that, the alloy has the characteristics of continuous dynamic recrystallization, and the flow stress increases with the increase of strain rate and the decrease of deformation temperature; The deformation activation energy Q=181.08 kJ/mol and stress index n=4.331 3 are calculated by the hyperbolic sine modified Arrhenius relation; Through the analysis of hot processing map to determine its at T=390 ℃ to 500 ℃, ε=0.001 s^-1 to 0.03 s^-1parameter range is most suitable for hot working; EBSD test results show that the recrystallization is more complete and the texture of the alloy is weaker at higher deformation temperature and lower strain rate.

Key words: wrought magnesium alloy, hot compression, constitutive model, hot processing map, texture soften