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采用Gleeble-1500热/力模拟试验机进行压缩试验,研究了Mg-6Zn-1Mn合金在变形温度250～450℃、应变速率0.001～10 s-1范围内的流变应力行为,采用Zener-Hollomon参数法构建合金高温塑性变形的本构关系;并以热压缩试验为基础,建立并初步分析了Mg-6Zn-1Mn合金的DMM加工图。结果表明:Mg-6Zn-1Mn合金在热压缩过程中发生了明显的动态回复与动态再结晶,流变应力随应变速率的增加而增加,随温度的升高而降低;流变应力的预测值与试验值较吻合;建立的加工图表明合金高温变形时存在2个失稳区域,而在温度325～425℃、应变速率0.01～0.365 s-1范围内出现1个非失稳区、功率耗散峰值区,该区域最适合Mg-6Zn-1Mn合金进行热加工。
The compressive tests were carried out on a Gleeble-1500 thermal / mechanical simulator. The flow stress behavior of Mg-6Zn-1Mn alloy at deformation temperature 250-450 ℃ and strain rate 0.001-10 s-1 was studied. Zener-Hollomon The constitutive relation of plastic deformation under high temperature was established by parameter method. Based on the hot compression test, the DMM processing diagram of Mg-6Zn-1Mn alloy was established and preliminary analyzed. The results show that the dynamic recrystallization and dynamic recrystallization of Mg-6Zn-1Mn alloy occur during hot compression. The flow stress increases with the increase of strain rate and decreases with the increase of temperature. The predicted value of flow stress And the experimental values are in good agreement. The established processing diagram shows that there are two instability zones in the high temperature deformation of the alloy, and one non-destabilizing zone appears at the temperature of 325-425 ℃ and the strain rate of 0.01-0.365 s-1. Scattered peak area, the most suitable for the region of Mg-6Zn-1Mn alloy for thermal processing.