基于小角散射技术的Al-Zn-Mg-Cu合金纳米尺度沉淀析出相研究

项目名称： 基于小角散射技术的Al-Zn-Mg-Cu合金纳米尺度沉淀析出相研究

项目编号： No.51274046

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 矿业工程

项目作者： 熊柏青

作者单位： 北京有色金属研究总院

项目金额： 86万元

中文摘要： 广泛应用于航空航天领域的Al-Zn-Mg-Cu系铝合金是典型的可时效强化型合金，其强化效果主要来自于时效过程中析出、尺度为纳米级、与基体呈共格或半共格关系的沉淀相。定量研究沉淀析出相的体积分数、尺寸分布、形状、质点间距及其化学组成，对合金综合性能预测、指导合金成分与工艺设计具有重要的作用。本项目拟以不同成分的Al-Zn-Mg-Cu系铝合金为研究对象，主要依托同步辐射X射线和中子小角散射及反常小角散射技术，围绕时效过程中沉淀析出相的变化及其与合金性能的关联性，构建小角散射/反常小角散射技术应用于铝合金沉淀析出相几何特征及其化学组成的原位表征新方法及其定量解析模式，探明合金成分和时效工艺对沉淀析出相的耦合影响规律，了解Cu、Zn元素对析出动力学的影响机制，建立合金力学及抗腐蚀等性能与沉淀析出相数量、分布及其化学组成之间的定量关系，揭示合金成分和时效工艺－沉淀析出相－综合性能的内在关系。

中文关键词： 析出相尺寸；析出相数量密度；析出相体积分数；力学性能；抗应力腐蚀性能

英文摘要： The age-hardenable Al-Zn-Mg-Cu aluminum alloys are widely used in the aerospace industry, due to their high strength and high toughness. The strengthening effect mainly comes from the coherent and semi-coherent nanoscale precipitates formed during the aging process. Quantitative information on the microstructures of the nano-precipitates (including their shape, size distribution, volume fraction, inter-precipitate distance and chemical composition), play an important role in the evaluation of alloy performance and the design of alloy composition and aging process. The present project chooses Al-Zn-Mg-Cu alloys with different compositions as the objects, and gives a quantitative study on the evolution of the nano-precipitate microstructures during different aging processes, based on the Synchrotron X-ray and Neutron Small-angle Scattering and Anomalous Small-angle X-ray Scattering Techniques. First, the in-situ small-angle scattering and anomalous small-angle scattering techniques applied to aluminum alloys will be developed, which are used to study the geometrical characteristics of precipitates and Cu/Zn contents in precipitates respectively. The relative quantitative analytical models will also be constructed. Based on the study, the coupling effects of alloy composition and the aging process parameters (tempe

英文关键词： Precipitate Size；Precipitate Number Density；Precipitate Volume Fraction；Mechnical Performance；Stress Corrosion Resistance