7056铝合金高温热压缩流变应力行为
Flow Stress Behavior of 7056 Aluminum Alloy During Hot Compression Deformation at Elevated Temperature
刘诗安1, 孟显娜2, 金能萍2, 张 辉2
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作者单位：1. 郴州职业技术学院, 湖南 郴州423000; 2. 湖南大学 材料科学与工程学院, 湖南 长沙 410082
中文关键字：7056铝合金； 热压缩变形； 流变应力； 变形激活能
英文关键字：7056 aluminum alloy; hot compression deformation; flow stress; deformation activation energy
中文摘要：在Gleeble-1500热模拟机上对7056铝合金进行热压缩实验，变形温度为300～450 ℃，应变速率为0.01～10 s-1，研究其热压缩流变应力行为。结果表明：流变应力开始随应变的增加而增大，出现峰值后逐渐趋于平稳；应力峰值随着温度的升高而减小，随着应变速率的增大而增大；可用包含Zener-Hollomon参数的双曲正弦关系来描述合金热流变行为，其变形激活能为224.3826 kJ/mol。
英文摘要：The flow stress behavior of 7056 aluminum alloy during hot compression deformation was studied by thermal simulation test on Gleeble 1500 system. The deformation temperature is from 300 ℃to 450 ℃ and the strain rate is from 0.01 s-1 to 10 s-1. The results show that the flow stress increases with the increase of strain and tends to be constant after a peak value. The peak stress increases with the increase of strain rate, and decreases with the increase of deformation temperature, which can be represented by a Zener-Hollomon parameters in the hyperbolic sine equation, and the hot deformation activation energy is 224.3826 kJ/mol.