为了考察Mg－10Gd－3Y－0．6Zr－1Ag镁合金在不同条件下的变形行为，采用 Gleeble2000热模拟机对该合金进行研究，分析了该合金在变形温度350～500℃，应变速率0．001～1 s－1条件下流变应力的变化规律．研究结果表明：变形温度和应变速率对流变应力有显著的影响，流变应力随变形温度的升高和应变速率的降低而降低；在应变速率相同的情况下，合金在较高温度下变形时，流变应力随应变量的增加达到峰值后，基本呈稳态流变特征；采用双曲正弦模型计算出该合金的变形激活能和应力指数，建立了该合金相应的热变形本构关系．
The Mg-10Gd-3Y-0. 6Zr-1Ag alloy has been performed on Gleeble2000 thermal simulator at the temperature from 350℃ to 500℃ with the strain rate from 0.001 s-1 to 1 s-1 , and the compressive deformation behavior in different deformation conditions has been studied. The results show that the flow stress is significantly affected by deformation temperature and strain rate, and the flow stress decreases with the deformation temperature increasing and strain rate decreasing. The flow stress tends to be constant after a peak value at higher deformation temperature with the constant strain rate. The deformation activation energy and stress exponent were evaluated by the hyperbolic?sine mathematics model and the hot deformation constitutive relationship was established.
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