The principle and control for solidification present crucial challenges.Through in situ and real time ob-servation 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 fluc-tuation 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 den-drites,controlling the dendritic segregation and eliminating the detrimental eutectics.

Xiaoping Ma;Dianzhong Li

Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Wenhua Road No.72,Shenyang 110016,PR China

材料科学技术（英文版）

[1]Xiaoping Ma;Dianzhong Li-.Multi-scale dendritic patterns sequentially superimposed in a primary semi-solid matrix)[J].材料科学技术（英文版）,2022(12):26-33

reconstitute

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