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在Gleeble-1500D热模拟机上进行热压缩试验,研究了变形温度为320～440℃、应变速率为0.001～1s-1,最大变形程度为60%的条件下挤压态AZ81镁合金的高温流变行为。结果表明,采用加工理论分析材料的高温变形行为能准确反映出材料在不同变形条件下的组织演变规律。根据材料动态模型计算了挤压态AZ81合金的热加工图,结合显微组织观察结果分析了挤压态AZ81镁合金的热加工塑性变形性能,在变形温度320～440℃、应变速率0.001～1 s-1,最大变形程度为60%的条件下,失稳判据ξ(ε)>0,说明AZ81镁合金在该条件下的塑性变形性能良好。热加工温度380～400℃、应变速率0.01～0.1 s-1为最佳热加工工艺参数区。
Hot compressing experiments were carried out on a Gleeble-1500D thermal simulator. The high temperature rheological properties of extruded AZ81 magnesium alloy were studied under the conditions of deformation temperature of 320-440 ℃, strain rate of 0.001-1s-1 and maximum deformation of 60% behavior. The results show that using the theory of machining to analyze the high temperature deformation behavior of the material can accurately reflect the microstructure evolution of the material under different deformation conditions. According to the dynamic model of material, the hot working diagram of extruded AZ81 alloy was calculated. The hot workability of AZ81 magnesium alloy was analyzed with microstructure observation. The results show that the hot - working plastic deformation behavior of AZ81 magnesium alloy under the condition of deformation temperature of 320-440 ℃, strain rate of 0.001-1 s-1, the maximum deformation degree is 60%, the instability criterion ξ (ε)> 0, which shows that the plastic deformation behavior of AZ81 magnesium alloy under this condition is good. Thermal processing temperature 380 ~ 400 ℃, strain rate 0.01 ~ 0.1 s-1 for the best thermal processing process parameters.