Effect of Co on Microstructure Transformation and Refinement Mechanism of Undercooled Cu-Ni Alloy  

作　　者：Willey Liew Yun Hsien 安洪恩 Nancy Julius Siambun Bih-Lii Chuab Willey Liew Yun Hsien;AN Hongen;Nancy Julius Siambun;Bih-Lii Chuab(Faculty of Engineering,University Malaysia Sabah,Kota Kinabalu,88400,Malaysia;College of Mechanical and Electronic Engineering,Huanghe Jiaotong University,Jiaozuo,454950,China;Henan Engineering Technology Research Center on Intelligent Manufacturing Technology and Equipment,Jiaozuo,454950,China)

机构地区：[1]Faculty of Engineering,University Malaysia Sabah,Kota Kinabalu,88400,Malaysia [2]College of Mechanical and Electronic Engineering,Huanghe Jiaotong University,Jiaozuo,454950,China [3]Henan Engineering Technology Research Center on Intelligent Manufacturing Technology and Equipment,Jiaozuo,454950,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2023年第4期877-884,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Basic Research Projects in Shanxi Province(No.202103021224183)。

摘　　要：Both Cu60Ni38Co2 and Cu60Ni40 alloy were naturally cooled after rapid solidification from the liquid phase.The transformation law of the microstructure characteristics of the rapidly solidified alloy with the change of undercooling(DT)was systematically studied.It was found that the two alloys experienced the same transformation process.The refinement structures under different undercoolings were characterized by electron backscatter diffraction(EBSD).The experimental results show that the characteristics of the refinement structure of the two alloys with low undercooling are the same,whereas,the characteristics of the refinement structure with high undercooling are opposite.The transmission electron microscope(TEM)results of Cu60Ni38Co2 alloy show that the dislocation network density of low undercooled microstructure is lower than that of high undercooled microstructure.By combining EBSD and TEM,it can be confirmed that the dendrite remelting fracture is the reason for the refinement of the low undercooled structure,while the high undercooled structure is refined due to recrystallization.

关 键 词：rapid solidification UNDERCOOLING MICROSTRUCTURE refinement structure 

分 类 号：TG146.11[一般工业技术—材料科学与工程]