Abstract
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.
基金项目
Youth Talent Project of Shenyang National Laboratory for Materials Science(L2019F46)
Project to Strengthen Industrial Development at the Grass-roots Level(TC190A4DA/35)
NETL
NSTL
维普
万方数据