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7150铝合金高温热压缩变形流变应力行为
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-12-17
在Gleeble−1500热模拟机上对7150铝合金进行高温热压缩实验，研究该合金在变形温度为300~450 ℃和应变速率为0.01~10 s−1 条件下的流变应力行为。
7150铝合金高温热压缩变形流变应力行为Flow stress behavior of 7150 aluminum alloy during hot compression deformation at elevated temperature
在Gleeble−1500热模拟机上对7150铝合金进行高温热压缩实验，研究该合金在变形温度为300~450 ℃和应变速率为0.01~10 s−1 条件下的流变应力行为。结果表明：流变应力在变形初期随着应变的增加而增大，出现峰值后逐渐趋于平稳；峰值应力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Arrhenius双曲正弦关系来描述合金的热流变行为，其变形激活能为226.698 8 kJ/mol；随着温度的升高和应变速率的降低，合金中拉长的晶粒发生粗化，亚晶尺寸增大，再结晶晶粒在晶界交叉处出现并且晶粒数量逐渐增加；合金热压缩变形的主要软化机制由动态回复逐步转变为动态再结晶。
The flow stress behavior of 7150 aluminum alloy during hot compression deformation was studied by thermal simulation test at the deformation temperature of 300−450 ℃ and the strain rate of 0.01−10 s−1 on the Gleeble−1500 thermal-mechanical simulator. The results show that the flow stress increases with increasing strain and tends to be constant after a peak value. The peak stress increases with increasing strain rate, and decreases with increasing deformation temperature, which can be represented by a Zener-Hollomon parameter in the hyperbolic sine equation with the hot deformation activation energy of 226.6988 kJ/mol. With increasing temperature and decreasing strain rate, the elongated grains in the deformed samples are coarsened and the size of subgrain increases; the number of fine grain in grain boundary also increases, indicating that the main softening mechanism of the alloy during hot compression deformation transforms from dynamic recovery to dynamic recrystallization.
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