Abstract
We present the processes and results of a numerical investigation of the bismuth unloading solidification by a graded density impactor, and demonstrate that the physical process may be realized due to bismuth abnormal melting characteristics. A more reasonable high-pressure solid equation of state of the fifth phase bismuth is introduced in our calculation and one type of graded density impactor made of 15 compositions of Mg-Cu material system is given in this paper. We detailedly investigate one possible proposed approach to achieve the unloading solidification physical process, and our numerical analysis on the thermodynamic state, the unloading path and the phase transformations.
Highlights
Bismuth in the solid state has many kinds of metal states
One type of graded density impactor (GDI) made of 15 compositions of Mg-Cu material system is given by using the theoretical analysis and numerical computation to study the physical process of bismuth unloading solidification
Our investigation demonstrates that bismuth may be resolidificated under unloading due to its abnormal melting characteristics, and an approach was found to achieve the physical process successfully
Summary
Bismuth in the solid state has many kinds of metal states. It is at a low pressure and temperature range of memory in a series of multi physiognomy phase transition. Duff [5] and his collaborators first studied the shock induced phase transition of bismuth They used two kinds of techniques of explosive load and electrical probe measurement speed, observed bismuth’s phase transition from the solid phase I to solid phase II in the experiment, but the phase transition pressure is about 0.25 GPa higher than the static pressure. Larson [6] used a kind of quartz probe velocimetry to study the shock induced phase transition of bismuth from the solid phase I to solid phase II, and obtained good agreement with the static high-pressure phase transition pressure. Considering the abnormal feature of melting curve, one possible approach is proposed to realize the physical process, which is the impact loading and unloading to melting of solid phase bismuth and subsequent unloading solidification in liquid region. For achieving the research we developed a one-dimensional elastic-plastic fluid dynamics program, which includes the calculation of phase transformation kinetics
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