Microstructure Transformation of Undercooled Cu-Ni-Co Alloy and Refinement Mechanism under High Undercooling  

作　　者：AN Hongen Willey Liew Yun Hsien Nancy Julius Siambun Bih-Li Chuab YANG Mengmeng YAN Wei LI Hongtao 

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2期440-444,共5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 (202103021224183)。

摘　　要：The molten Cu60Ni35Co5 ternary alloy was undercooled by fluxing method and solidified by natural cooling method.The microstructure of all undercooled samples were analyzed.It is found that the rapidly solidified Cu60Ni35Co5 alloy has undergone two grain refinement phenomena within the undercooling range,and its microstructure and morphology change with the undercooling through the transformation process of“coarse dendrite-equiaxed dendrite-oriented fine dendrite-equiaxed crystal”.The refined structure with the maximum undercooling?T of 253 K was selected for electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM)tests.EBSD results show that the refined structure contains a high proportion of large angle grain boundaries(LAGBs),a large number of randomly oriented grains,and high proportion of twins,while TEM results show that the dislocation density in most areas is relatively low.The above characteristics confirm that the solidification structure is refined due to recrystallization behavior under high undercooling.

关 键 词：MICROSTRUCTURE grain refinement RECRYSTALLIZATION 

分 类 号：TG113[金属学及工艺—物理冶金]