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采用圆柱试样在Gleeble-1500材料热模拟试验机上对ZM61镁合金进行等温压缩变形试验,研究了该合金在变形温度为300～390℃、应变速率为0.001～0.1 s-1条件下的流变行为。结果表明:ZM61镁合金热压缩时流变应力随流变速率的降低和变形温度的升高而减小,其热压缩变形过程分为加工硬化、过渡、软化和稳态流变四个阶段;ZM61镁合金的热流变行为可用包含Arrhenius项的Zener-Hollomon参数来描述,其热变形本构方程为:ε=1.1915×1015[sinh(0.020756σ)]4.3159 exp(-201.86×103/RT),该本构关系的计算结果与实验结果之间的相对误差小于12.9%,可为制定ZM61镁合金的热加工工艺提供理论依据。
A series of isothermal compression tests on ZM61 magnesium alloy were carried out on a Gleeble-1500 thermal simulator using a cylindrical specimen. The rheological behavior of the alloy at temperatures ranging from 300 ℃ to 390 ℃ and strain rates from 0.001 to 0.1 s-1 behavior. The results show that the flow stress of ZM61 magnesium alloy decreases with the decrease of rheological rate and deformation temperature during hot compression. The hot compressive deformation process is divided into four stages of work hardening, transition, softening and steady flow. The thermal rheological behavior of ZM61 magnesium alloy can be described by Zener-Hollomon parameters including Arrhenius term. The thermal deformation constitutive equation is: ε = 1.1915 × 1015 [sinh (0.020756σ)] 4.3159 exp (-201.86 × 103 / RT) , The relative error between the calculated results and experimental results of the constitutive relationship is less than 12.9%, which provides a theoretical basis for the thermal processing of ZM61 magnesium alloy.