Analysis Of Rapid Solidification Process Of Metal W Under High Pressure

This article briefly summarizes the basic theories of rapid solidification and the microstructure characteristics of amorphous metals,as well as the computer simulation study of the liquid metal tungsten(W)solidification process;details the reliability of the simulation research method and the microstructure characterization method in this article.The EAM potential is used to simulate the solidification process of liquid metal W under different pressures,and the two-body distribution function,maximum cluster analysis method,three-dimensional visualization and other methods are used to study the phase transition and microstructure evolution during the solidification of metal tungsten under high pressure conditions.Physical mechanism.The results show that the pressure has an important effect on the evolution of the microstructure during the solidification process,especially the influence on the phase transition.At the same time,it has been found that special materials with excellent pro perties may be produced under high pressure.Two-body distribution function and maximum cluster analysis(LSCA)found that the pure W melt with a cooling rate of 0.1K/ps and a pressure of40-100 GPa first crystallizes into body-centered cubic(BCC)crystal s,and then passes through a series of intermediate states to transform Formed into hexagonal close packed(HCP)crystals,including a small amount of FCC crystals.Kinetic factors may induce intermediate stages during the liquid-solid transition,and crisscross grain boundaries make too many intermediate stages indistinguishable,making the solid-solid transition look like a continuous transition.In addition,as a parameter-free structural analysis method for disordered systems,LSCA can detect more detai ls about structural evolution by calculating novel indicators(such as topologically close-packed atomic information and average cut-off distance),especially when the structure is violent.The process of changing phase change.This paper also separately a nalyzed the microstructure evolution law of the system at 100 GPa,and the influence of thermodynamic and kinetic competition on the grain boundary process.These findings not only deepen the understanding of metal crystallization under high pressure,but also provide an effective way to describe the structure of liquids and supercooled liquids.