fa گروه سرامیک Ceramic Materials and Engineering Research Paper Research Paper AZ31 magnesium alloy is considered as a promising alloy in various applications and industries. Furthermore, to design a proper hot working process (rolling, forging and extrusion), the assessment of hot working behaviour of the alloy is necessary. Accordingly, the hot deformation behaviour of AZ31 alloy was studied through hot compression testing method This was carried out in a wide range of temperature (523K to 783K) and strain rates. The obtained true stress-true strain curves and final microstructures were examined and a partial melting was realized at 740K. It was concluded that the presence of liquid did change the deformation mechanisms thereby affecting the flow behaviour. AZ31 alloy, Deformation, Dynamic recrystallization 9 15 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-1-51&slc_lang=fa&sid=1 FATEMI-VARZANEH S.M. 18003194753284600124 18003194753284600124 Yes ZAREI-HANZAKI A. 18003194753284600125 18003194753284600125 No