Metallic melt fracture and fragmentation under the high-current electron irradiation
Action of the high-current electron beam leads to an intensive heating of a surface layer of the irradiated metal. Rapid temperature increase can cause melting of the surface layer and generate intensive stresses in it. Release of these stresses induces fast expansion of the molten metal and, on the contrary, results in tension. Tension of the melt activates nucleation, growth and coalescence of vapor bubbles, it means, fracture and fragmentation of the metallic melt. In present work we numerically investigate kinetics of the liquid metal fracture and fragmentation under the dynamic tension initiated by the powerful electron irradiation. Metal is treated as a two-phase medium consisting of vapor bubbles in liquid metal at the first stage of the evolution and of liquid drops in vapor at the second stage. Two-level approach is used: on the macroscopic level, the irradiated metal is treated as a two-phase heterogeneous medium in the one-velocity approximation, while on the microscopic level, the exchange of energy, mass and volume between both phases are described including grow or decrease of size of the vapor bubbles or liquid drops. Generation of ultra-dispersed particles of copper at the high-current electron beam irradiation is numerically investigated.
Liquid metal Dynamic fracture Electron irradiation Heterogeneous medium Vapor bubbles
Polina N. Mayer. Alexander E. Dudorov Alexander E. Mayer
Department of Physics,Chelyabinsk State University,454001,Russia
国际会议
北京
英文
1-8
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）