Li对7075铝合金组织转变动力学的影响

Influence of Lithium on the Kinetics of the Microstructural Transformations in 7075-Li Alloy

摘要:

采用差热分析法研究了7075铝合金的时效析出行为及Li对该合金时效过程组织转变的影响，并对含Li和不含Li的7075铝合金中GP区和η’相溶解动力学参数进行了计算。结果表明Li对GP区溶解激活能影响不大，但显著提高了η'相的溶解激活能。

Abstract:

Differential Scanning Calorimetric(DSC) techniques are used to study the precipitation behaviour of 7075 aluminum alloys and the influence of Li on the microstructure transformation of the7075-Li alloy during aging. The kinetic parameters for GP zones and h phase dissolution are calculated in 7075 and 7075+Li alloys. The results show that Li slightly affects the activation energy for GP zones dissolution, but markedly raises the activation energy for h phase dissolution.