工业硬铝 LY_(12)合金超塑变形过程的激活能

Activation Energy During Superplastical Deformation of Comercial Aluminium Alloy LY_(12)

本文研究了LY_12硬铝合金在最佳超塑预处理工艺条件下超塑变形时的流动应力和应变速率的对数关系,测定了该合金超塑变形过程的激活能,从能量角度探讨了该合金在超塑变形过程中的变形机理。研究结果表明,在超塑变形Ⅱ区,界面扩散控制着变形过程;在超塑变形Ⅲ区,体积扩散控制着变形过程。此结果与SEM扫描电镜观察结果一致。

This paper has represented a resesrch on the natural logarithm stress and strain-rate during superplastical deformation of the comercial Alltumin- ium Alloy LY_l2. On the basis of measuring the activation energy of the alloy during the superplastical deformation the mechanisms of the alloy during the superpla- stical deformation was expounded from the point of energy.The results have showed that.the diffnsion in the surfaces of crystal boundary controlls the superplastical deformation in the superplastical Ⅱ regiorn and the diffusion in the body of crystal grains controlls the deformation in the superplastical Ⅲ region. The alove results are confirmed by SEM.