Cu对6000系和7000系铝合金时效过程中微结构演变的影响  

Effects of Cu Addition on the Microstructural Evolution during Ageing of 6000 and 7000 Al Alloys

作　　者：张凯[1,2] 李凯[1,2] 杜勇[1,2] 辛婧华 方旭[1,2] 宋旼[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]中南大学中德铝合金微结构联合实验室,湖南长沙410083

出　　处：《中国材料进展》2014年第6期327-336,360,共11页Materials China

基　　金：国家重点基础研究发展计划(2011CB610401)

摘　　要：介绍了几种研究铝合金时效过程中微结构演变的先进实验及模拟手段,包括用于显示原子列Z衬度的高角环形暗场-扫描透射电子显微术(HAADF-STEM)、分析微区中不同元素三维空间分布的三维原子探针技术(3DAP)、复杂选区电子衍射(SAED)模拟及第一性原理计算。综述了近年来作者及国内外学者使用这些手段研究Cu元素添加对6000系和7000系铝合金时效过程中微结构影响的进展,包括Cu添加对合金析出序列、时效析出速率、合金的析出硬化效果、析出物(如GP区、β″亚稳相、η平衡相等)的化学计量比及原子占位等的影响。最后展望了采用热力学、动力学计算及相场模拟等方法在铝合金设计中的应用,指明了通过对铝合金微结构进行定量模拟并结合关键实验验证来实现铝合金高效设计的发展方向。Several advanced techniques in characterizing the microstructural evolution during ageing of Al alloys are briefly described.These include high-angle annular dark field scanning transmission electron microscopy applicable to re-veal the Z contrast of atomic columns , 3-dimensional atom probe which can visualize the spatial distribution of different el-ements in sub-micron regions of materials, simulation of complicated selected area electron diffraction and first-principles calculations.The state-of-art progress on the effect of Cu addition on the precipitation sequence of alloys , the precipitation kinetics, the age hardening response, the compositions and detailed structures of different precipitates （ such as GP zones,β″phase,ηphase） , and other aspects of microstructural evolution during ageing of 6000 Al-Mg-Si and 7000 Al-Zn-Mg Al alloys have been summarized .Finally the highly efficient alloy design based on the phase field simulations coupled with experimental verification is stressed.

关 键 词：铝合金 微结构 SAED模拟 HAADF-STEM 3DAP Cu添加 

分 类 号：TG146.21[一般工业技术—材料科学与工程]