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用Gleeble-1500热/力模拟机研究Mg-9Y-3Zn-0.5Zr镁合金在应变速率为0.001~0.1/s,变形温度为543~743 K下的热变形行为,分析实验合金在高温变形时的流变应力和应变速率及温度之间的关系,计算变形激活能和应力指数,并讨论热压缩过程中的组织变化。结果表明:在同一变形温度下,实验合金的真应力水平随应变速率的增加而增加,随温度的提高而降低且表现出明显的再结晶特征。当变形温度在643~693 K时,激活能变化不大;当温度大于693 K时,激活能随温度升高而增大。当温度达到693 K时,合金发生了完全再结晶。Mg-9Y-3Zn-0.5Zr合金在693 K挤压后的抗拉强度为340.0 MPa,伸长率为16.2%;该合金在时效后的抗拉强度为396.4 MPa,伸长率为6%,时效抗拉强度明显上升。
The thermal deformation behavior of Mg-9Y-3Zn-0.5Zr magnesium alloy at strain rate of 0.001 ~ 0.1 / s and deformation temperature of 543 ~ 743 K was studied by Gleeble-1500 thermal / mechanical simulator. The relationship between flow stress and strain rate and temperature was calculated, and the deformation activation energy and stress index were calculated. The microstructural changes during hot compression were also discussed. The results show that at the same deformation temperature, the true stress of the experimental alloy increases with the increase of strain rate, decreases with the increase of temperature, and shows obvious recrystallization characteristics. When the deformation temperature is in the range of 643-693 K, the activation energy does not change much. When the temperature is higher than 693 K, the activation energy increases with the increase of temperature. When the temperature reached 693 K, the alloy completely recrystallized. The tensile strength of the Mg-9Y-3Zn-0.5Zr alloy after pressing at 693 K is 340.0 MPa and the elongation is 16.2%. The tensile strength of the alloy after aging is 396.4 MPa and the elongation is 6% Aging tensile strength increased significantly.