利用 Gleeble?1500热模拟机研究固溶态 Mg?xZn?yEr 合金(x/y=6, x=3.0,4.5,6.0； y=0.50,0.75,1.00)在变形温度为200~450°C、应变速率为0.001~1 s?1下的热压缩变形行为。研究结果表明，在热压缩变形过程中加工硬化和加工软化同时发生，并相互竞争，其中合金加工软化主要由动态再结晶引起。构建了 Mg?Zn?Er 合金的本构方程，该本构方程能比较精确地预测合金的峰值应力。添加 Zn、Er 合金化元素致使 Mg?3Zn?0.5Er(合金 A)具有较高变形激活能。在温度和应变速率的二维平面内建立了合金的热加工图，并提供了合金的最优加工条件(应变量为0.3，Mg?3Zn?0.5Er 合金(合金 A)：380~430°C,<0.1 s?1； Mg?4.5Zn?0.75Er 合金(合金 B)：380~450°C,0.01~0.1 s?1；Mg?6Zn?1Er 合金(合金 C)：390~440°C,0.01~0.1 s?1)。与 Mg?3Zn?0.5Er (合金 A)和 Mg?6Zn?1Er (合金 C)相比， Mg?4.5Zn?0.75Er (合金 B)表现较优的热加工窗口。
The hot deformation behaviors of as-solution Mg?xZn?yEr alloys (x/y=6, x=3.0, 4.5 and 6.0; y=0.50, 0.75 and 1.00) were investigated on Gleeble?1500 thermal simulator in a temperature range of 200?450 °C at a strain rate of 0.001?1 s?1. The true stress?strain curves showed the dynamic competition between the working hardening and working softening mainly due to the dynamic recrystallization (DRX) occurring during hot compression. The constitutive equations were constructed which could accurately predict the peak stress of the alloys. The addition of Zn and/or Er resulted in higher deformation activation energy for Mg?3Zn?0.5Er (alloy A). The processing maps were constructed as function of the temperature and the strain rate, providing the optimum hot working conditions (i.e., at strain of 0.3, Mg?3Zn?0.5Er (alloy A): 380?430 °C, <0.1 s?1; Mg?4.5Zn?0.75Er (alloy B):380?450 °C, 0.01?0.1 s?1; Mg?6Zn?1Er (alloy C): 390?440 °C, 0.01?0.1 s?1). The as-solution treated Mg?4.5Zn?0.75Er (alloy B) demonstrated more optimum hot working window comparing with Mg?3Zn?0.5Er (alloy A) and Mg?6Zn?1Er (alloy C).
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