The evolution of the 3D Fe-rich phases of Al-7.0Si-1.2Fe alloys with different Mn contents was visualized and character-ized using synchrotron X-ray computed tomography,and the effect of Fe-rich phases with typical morphologies on the fracture behavior during tensile testing was analyzed.The results showed that the Fe-rich phase changed from platelet-like β-Al5FeSi into α-Al15(FeMn)3Si2 with various morphologies after the addition of Mn.The Mn addition not only significantly reduced the volume fraction,equivalent diameter and interconnectivity of the Fe-rich phase but also greatly increased the sphericity,surface thickness,and distribution of the mean curvature and surface thickness.Furthermore,the equivalent diameter of α-Al15(FeMn)3Si2 had an inverse exponential function relationship with its sphericity.The 3D morphology of α-Al15(FeMn)3Si2 can be summarized as massive and regular polyhedrons,hollow and regular polyhedrons,and multi-branched polyhedrons.The fraction of the different 3D morphologies in each alloy is related to the Mn content,where excess Mn increased the number and volume fraction of the large Fe-rich particles with a low sphericity.The ductility of each alloy was significantly improved by the addition of Mn but gradually decreased when the Mn/Fe ratio exceeded 1.2.The increase in large α-Al15(MnFe)3Si2 with a low sphericity was the main reason for the decreased ductility of alloys with a high Mn content.

Dong-Fu Song;Yu-Liang Zhao;Zhi Wang;Yi-Wang Jia;Dao-Xi Li;Ya-Nan Fu;Da-Tong Zhang;Wei-Wen Zhang

National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510641,China;Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application,Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,China;School of Mechanical Engineering,Dongguan University of Technology,Dongguan 523808,China;Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China

金属学报（英文版）

[1]Dong-Fu Song;Yu-Liang Zhao;Zhi Wang;Yi-Wang Jia;Dao-Xi Li;Ya-Nan Fu;Da-Tong Zhang;Wei-Wen Zhang-.3D Fe-Rich Phases Evolution and Its Effects on the Fracture Behavior of Al-7.0Si-1.2Fe Alloys by Mn Neutralization)[J].金属学报（英文版）,2022(01):163-175

Al15,3Si2,MnFe

Rich,Phases,Evolution,Its,Effects,Fracture,Behavior,0Si,2Fe,Alloys,by,Neutralization,evolution,rich,phases,alloys,different,contents,was,visualized,character,using,synchrotron,ray,computed,tomography,effect,typical,morphologies,fracture,behavior,during,tensile,testing,analyzed,results,showed,that,changed,from,platelet,like,Al5FeSi,into,FeMn,various,after,addition,not,only,significantly,reduced,volume,fraction,equivalent,diameter,interconnectivity,also,greatly,increased,sphericity,surface,thickness,distribution,mean,curvature,Furthermore,had,inverse,exponential,function,relationship,its,morphology,summarized,massive,regular,polyhedrons,hollow,multi,branched,each,related,where,excess,number,large,particles,ductility,improved,gradually,decreased,when,ratio,exceeded,main,reason,high

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