含Li的Al-Zn-Mg-Cu合金沉淀析出过程的定量分析

Quantitative Analysis of Precipitation in a Li Containing Al-Zn-Mg-Cu Alloy

摘要:

应用小角度X射线散射技术结合TEM分析定量的描述Al-Zn-Mg-Cu-Li合金时效过程中析出相尺寸分布和形貌等信息。通过分析确定合金在几种时效状态下析出相为轴比在0．2～0．4之间的扁回转椭球形。确定了析出相特征尺寸的对数正态分布和质量依回转半径的Maxwell分布。并分析分布曲线随动力强度Ks的变化特征，可以看出，析出相尺寸和质量分布曲线基本满足随动力强度增加，几何平均值增加，分布范围变宽。

Abstract:

The precipitates size distribution and morphology in an Al-Zn-Mg-Cu-Li alloy are studied by small angle X-ray scattering and transmission electron microscopy. The results show that the precipitates belong to ellipsoid and their axis ratio range is between 0.2 and 0.4, aged under different conditions. The logarithm Gaussian distribution of effective size and the Maxwell distribution of particles mass with gyration radius are also constructed. The changing of both types of distribution curves with kinetic strength Ks has been analyzed.. The results show that the geometric average and distribution width for both types of distribution curves increase with kinetic strength.