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在液态空气温度至350℃的范围内,用在形变过程中改变形变速率和温度的方法测定了Al-Cu合金多晶体(α+θ相)的流变应力和形变速率、温度之间的依赖关系。 从高温区域流变应力和形变速率的对数以及温度之间的线性关系得出激活能约为1.7eV左右,与纯铝的自扩散激活能相近。同时计算得激活体积随形变度的增大和温度的降低而减小。这些结果说明:Al-Cu合金中高温区流变应力可以用Hirsch的割阶理论来解释。 在低温区域存在着另一个热激活过程,由速度效应和应力弛豫实验得出的激活体积均随形变度的增大而减小,而且二者在数值上也符合。
The rheological stress and strain rate of the Al-Cu alloy polycrystal (α + θ phase) and the dependence of temperature on the temperature were measured in the range of liquid air temperature to 350 ℃ by changing the deformation rate and temperature during the deformation process relationship. From the logarithm of the logarithm of the flow stress and strain rate in the high temperature region and the linear relationship between the temperatures, the activation energy is about 1.7eV, which is similar to the self-diffusion activation energy of pure aluminum. At the same time, the activation volume decreased with the increase of deformation degree and the decrease of temperature. These results show that the flow stress at high temperature in Al-Cu alloys can be explained by the Hirsch’s cut-order theory. In the low temperature region, there is another thermal activation process. The activation volume obtained from the velocity effect and the stress relaxation experiment both decrease with the increase of the deformation degree, and both of them coincide with each other in magnitude.