Hot Compression Deformation Behavior of Mg-Gd-Nd-Zr Heat-Resistant Magnesium Alloy

Abstract

Abstract. The hot compression deformation of Mg-12Gd-2.5Nd-0.5Zr heat-resistant magnesium alloy was carried out on Gleeble-1500D thermo-mechanical simulator with the strain rate range of 0.002-1 s -1 , the deformation temperature range of 623-773 K and maximum strain of 50 %. The results show that true stress decreases with the increase of deformation temperature at a constant strain rate, and the true stress increases with the increase of strain rate at a same temperature. The deformation constitutive equation was established, and the hot deformation activation energy of 292.679 kJ/mol is determined.

Effect of Ag Addition on the Hot Deformation, Constitutive Equations and Processing Maps of a Hot Extruded Mg-Gd-Y Alloy

“…The apparent activation energy of 321 kJ mol À1 was obtained for the GW63 alloy. Other studies have also reported similar high activation energies of 308, 354 and 292 kJ mol À1 for the Mg-10Gd-3Y-0.5Zr, [47] Mg-3.7Gd-2.9Y-0.7Zn-0.7Zr [48] and Mg-12Gd-2.5Nd-0.5Zr [49] alloys, respectively. In another study, [50] high activation energies of 216 to 460 kJ mol À1 were found for an extruded Mg-9Gd-4Y-0.4Zr alloy after deformation in a temperature range of 673 K to 758 K. All of these high activation energies are in agreement with those related to the dislocation viscous glide mechanism.…”