Microstructure Transition and Grain Refinement Mechanism of Undercooled Alloys  

作　　者：LI Hongtao Nancy Julius Siambun Bih-Lii Chuab Melvin Gan Jet Hong AN Hongen 李洪涛;Nancy Julius Siambun;Bih-Lii Chuab;Melvin Gan Jet Hong;安红恩(College of Mechanical and Electronic Engineering,Huanghe Jiaotong University,Jiaozuo 454950,China;Faculty of Engineering,University Malaysia Sabah,Kota Kinabalu 88400,Malaysia;Henan Engineering Technology Research Center on Intelligent Manufacturing Technology and Equipment,Jiaozuo 454950,China)

机构地区：[1]College of Mechanical and Electronic Engineering,Huanghe Jiaotong University,Jiaozuo 454950,China [2]Faculty of Engineering,University Malaysia Sabah,Kota Kinabalu 88400,Malaysia [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)》2021年第6期922-926,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Basic Applied Research Projects in Shanxi Province(No.201801D221151);the Key R&D and Promotion Projects in Henan Province(No.212102210267)。

摘　　要：The solidification microstructures of undercooled Ni90Cu10 alloys under different undercoolings were studied systematically by means of melt coating and cyclic superheating.In the obtained undercooling range,the solidification structures of the two undercooled alloys have similar transformation processes,and there are two kinds of grain refinement structures under the conditions of low undercooling and high undercooling,respectively.The microstructures of the two grain refinement processes were analyzed in more detail by electronic backscattering diffraction technique.Under the condition of small undercooling,dendrite remelting is considered to be the main reason of grain refinement.However,under the condition of high undercooling,the existence of annealing twins and obvious migration of grain boundary are important evidences for the occurrence of recrystallization process.

关 键 词：microstructure transition grain refinement undercoolcd alloys Ni-Cu alloys 

分 类 号：TG113[金属学及工艺—物理冶金]