Mg-5Y-0.5Ce-0.5Zr合金的热压缩行为

Hot compression behavior of Mg-5Y-0.5Ce-0.5Zr alloy

摘要:

在变形温度为300～450 oC、应变速率为0.01～1 s-1的条件下进行热压缩试验，对Mg-5Y-0.5Ce-0.5Zr镁合金的热变形行为进行了研究。结果表明，在热压缩变形过程中，该合金的流变应力随着变形温度和应变速率的变化而变化。在同一应变速率下，流变应力随着变形温度的增高而降低；在同一变形温度下，流变应力随着应变速率的减小而减小。该合金热压缩流变应力的本构方程可采用双曲正弦形式构建，热变形激活能Q为253 kJ/mol。

Abstract:

The hot deformation behavior of Mg-5Y-0.5Ce-0.5Zr magnesium alloy was studied by means of hot compression tests at deformation temperatures from 300 oC to 450 oC and strain rates from 0.01 s-1 to 1 s-1. The results showed that the flow stress of the alloy is changed with deformation temperature and strain rate during the hot compression deformation. The flow stress of the alloy decreases with increasing deformation temperature at the same strain rate, and decreases with decreasing strain rate at the same deformation temperature. The constitutive equation for hot compression flow stress of the alloy is established in a hyperbolic-sine form. The hot deformation activation energy Q of the alloy is 253 kJ/mol.