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采用铸造的方法制备了Mg-5Gd-3Sm-0.5Zr耐热镁合金,对实验材料进行固溶时效处理,在应变速率0.002~0.1 s~(-1)、变形温度350~500℃、最大变形量70%条件下,利用Gleeble-1500热模拟试验机进行热压缩变形实验,分析材料在不同变形条件下的真应力真应变曲线及组织变化。结果表明:在恒应变速率下热变形,真应力水平随温度升高而降低;在相同温度下进行压缩变形,实验合金的真应力随应变速率的增加而提高;实验合金适合热加工的温度在400℃以上;对数据进行处理,得到了实验材料的热变形激活能Q=222.433 k J/mol,本构方程为ε=1.70×1014[sinh(0.015σ)]3.77exp[-222433/(8.314T)]。
The Mg-5Gd-3Sm-0.5Zr heat-resistant magnesium alloy was prepared by casting method. The aging treatment was carried out at the strain rate of 0.002-0.1 s -1, the deformation temperature of 350-500 ℃ and the maximum deformation Under the condition of 70%, the hot compressive deformation experiment was conducted on the Gleeble-1500 thermal simulator to analyze the true stress-strain curves and the microstructural changes under different deformation conditions. The results show that the true stress decreases with the increase of temperature at constant strain rate. The compressive deformation at the same temperature increases the true stress of the experimental alloy with the increase of strain rate. The thermal deformation activation energy Q = 222.433 kJ / mol and the constitutive equation ε = 1.70 × 1014 [sinh (0.015σ)] 3.77exp [-222433 / ( 8.314T)].