Hot compression behavior of Mg-Zn-Y-Mn-Ti magnesium alloy enhanced by lamellar LPSO phase and spherical W phase

The hot compression experiments of the solution-treated Mg93.5Zn2.5Y2.5Mn1Ti0.5 alloy were carried out using a Gleeble-1500D thermal simulator under the conditions of a temperature of 350 similar to 500 degrees C, a strain rate of 0.001-1 s(-1) and a strain of 0.9. According to the stress-strain curve, the characteristics of flow stress were analyzed. Moreover, the constitutive equation of flow stress, the kinetic model of dynamic recrystallization, and the processing map were established. The results show that the flow stress of the alloy decreases as the deformation temperature increases or the strain rate decreases. The constitutive equation of flow stress can be expressed as a hyperbolic sine function. (epsilon) over dot = 4.27115x10(19) [sinh(0.01153 sigma)](8.493) x exp(2.856) x 10(5) /RT). With the increase of the deformation temperature or the decrease of the strain rate, the volume fraction and grain size of dynamic recrystallization of the alloy increase continuously. Its dynamic recrystallization volume fraction can be expressed by the Avrami equation as. X-DRX = 1 - exp[-2.05((epsilon - epsilon(c))/epsilon*)(1.42)]. The instability region of the alloy increases with the increase of strain. The first instability region is (350-410 degrees C, 0.12-1 s(-1)), the second one is (450-500 degrees C, 0.001-1 s(-1)), and the optimum domain for the hot processing of this alloy is (380-450 degrees C, 0.001-0.01 s(-1)). (c) 2023 The Author(s). Published by Elsevier B.V.