Multi-scale dendritic patterns sequentially superimposed in a primary semi-solid matrix  

作　　者：Xiaoping Ma Dianzhong Li 

机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Wenhua Road No.72,Shenyang 110016,PR China

出　　处：《Journal of Materials Science & Technology》2022年第12期26-33,共8页材料科学技术（英文版）

基　　金：supported by the Youth Talent Project of Shenyang National Laboratory for Materials Science(Grant No.L2019F46);the Project to Strengthen Industrial Development at the Grass-roots Level(Grant No.TC190A4DA/35)。

摘　　要：The principle and control for solidification present crucial challenges.Through in situ and real time observation on the solidification of M50 bearing steel,here we discovered that the base of conventional dendritic arms is constituted by a primary semi-solid matrix.Due to the superimposition of temperature fluctuations from the large to the subtle scale,multi-scale dendritic patterns will sequentially emerge and evolve in the primary semi-solid matrix.These findings redefine the essence of multi-scale dendrites as the multi-scale segregation patterns in the primary semi-solid matrix,reconstitute the time and space sequence in the formation of multi-scale dendrites,and reveal the superimposition of temperature fluctuation as the driving principle.These new understandings will fundamentally influence the solidification field.These results also indicate important engineering applications,such as designing multi-scale dendrites,controlling the dendritic segregation and eliminating the detrimental eutectics.

关 键 词：SOLIDIFICATION DENDRITE Microstructures MICROSEGREGATION MACROSEGREGATION 

分 类 号：TG142.1[一般工业技术—材料科学与工程]