Microstructure evolution during homogenization of Al-Mg-Si-Mn-Fe alloys: Modelling and experimental results  

Al-Mg-Si-Mn-Fe系合金均匀化过程中的显微组织演化:数值模拟与实验结果对比（英文）

作　　者：C.L.LIU H.AZIZI-ALIZAMINI N.C.PARSON W.J.POOLE Q.DU 

机构地区：[1]Department of Materials Engineering, The University of British Columbia, Vancouver V6T 1Z4, Canada [2]Department of Materials Science and Engineering, Mc Master University, Hamilton L8S 4L7, Canada [3]Rio Tinto, Arvida Research and Development Centre, P. O. Box 1250, Jonquière (QC) G7S 4K8, Canada [4]SINTEF Materials and Chemistry, P. O. Box 4760 Sluppen, 7456 Trondheim, Norway

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第4期747-753,共7页中国有色金属学报（英文版）

基　　金：support from Rio Tinto Aluminium;NSERC are gratefully acknowledged

摘　　要：Microstructure evolution during the homogenization heat treatment of an Al?Mg?Si?Fe?Mn(AA6xxx)alloy wasinvestigated using a combination of modelling and experimental studies.The model is based on the CALPHAD-coupledhomogenization heat treatment model originally developed for AA3xxx alloys(i.e.,Al?Mn?Fe?Si).In this work,the model wasadapted to the more complex AA6xxx system(Al?Mg?Si?Mn?Fe)to predict the evolution of critical microstructural features suchas the spatial distribution of solute,the type and fraction of constituent particles and dispersoid number density and size distribution.Experiments were also conducted using three direct chill(DC)cast AA6xxx alloys with different Mn levels subjected to varioushomogenization treatments.The resulting microstructures were characterized using a range of techniques including scanning electronmicroscopy,electron microprobe analysis(EPMA),XRD,and electrical resistivity measurements.The model predictions werecompared with the experimental measurements,and reasonable agreement was found.通过数值模拟和实验相结合的方法,对Al-Mg-Si-Mn-Fe(AA6xxx)系合金均匀化过程中的显微组织演化进行研究。所应用的数学模型是结合CALPHAD及基于AA3xxx(Al-Mn-Fe-Si)系合金均匀化热处理而开发的。而后对此模型进行修正,以使得其应用拓展到更为复杂的AA6xxx系合金。该热处理模型可以预测包括溶质元素分布、初生相类型与比例、以及弥散相密度和尺寸分布在内的关键显微组织的演化。实验方面,对3种不同锰含量的AA6xxx系合金进行均匀化热处理。应用扫描电子显微镜、EPMA、XRD和电阻率等实验手段对所得均匀化组织进行多角度表征。预测结果与实验表征的对比表明,数学模型可以较为准确地反映均匀化过程中显微组织的演化。

关 键 词：AA6xxx alloy homogenization heat treatment mathematical modelling CALPHAD DIFFUSION 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG166.3[金属学及工艺—金属材料]