Hot workability characteristics of magnesium alloy AZ80—A study using processing map
Hot workability characteristics of magnesium alloy AZ80—A study using processing map
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DOI：
10.1016/j.msea.2009.12.009
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发表时间：
2010-03
期刊：
影响因子：
6.4
通讯作者：
Haitao Zhou;Qingzhu Li;Ziqian Zhao;Zhaoyang Liu;S. Wen;Qudong Wang
中科院分区：
文献类型：
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作者：
Haitao Zhou;Qingzhu Li;Ziqian Zhao;Zhaoyang Liu;S. Wen;Qudong Wang
采用Gleeble-1500热模拟试验机对铸态AZ 80镁合金的压缩变形行为进行了研究。测试在200-500°C的温度范围和0.001- 20 s-1的应变速率下进行。结果表明，该合金的流变应力行为符合双曲正弦本构方程，其平均激活能为154.6kJ/mol。通过流变应力行为，根据动态材料模型计算和分析了加工图。在加工图中，功率耗散效率的变化被绘制为温度和应变速率的函数。这些图显示了在420-500°C的温度范围和10−3s− 1至10−2s− 1的应变速率范围内发生的动态再结晶（DRX）域，这是合金热加工的最佳参数。流动行为的不稳定区也可以通过图识别。
The deformation behavior of as-cast AZ80 alloy is investigated by compression test with gleeble-1500 thermal simulator. The tests are performed in the temperature range of 200–500°C and the strain rate of 0.001–20s−1. It is found that the flow stress behavior is described by the hyperbolic sine constitutive equation in which the average activation energy of 154.6kJ/mol is calculated. Through the flow stresses behavior, the processing maps are calculated and analyzed according to the dynamic materials model. In the processing map the variation of the efficiency of the power dissipation is plotted as a function of temperature and strain rate. The maps exhibit a domain of dynamic recrystallization (DRX) occurring at the temperature range of 420–500°C and in the strain rate range of 10−3s−1to 10−2s−1which are the optimum parameters for hot working of the alloy. The instability zones of flow behavior can also be recognized by the maps.