Numerical Simulation Of Zr-based Bulk Amorphous Alloys During Continuous Casting Solidification Process

There are many excellent performances of Bulk glassy alloys (BGA) because of their unique characteristic. The preparation of BGA is an important aspect in engineering application of BGA, therefore the investigation of high efficiency and low cast continuous manufacturing techniques of glassy alloys makes a good sense nowadays.In this paper, the current status about numerical simulation of amorphous alloys during casting solidification process is reviewed. The temperature fields of solidification of Zr-based BGA during cooper casting were also simulated. Through comparison of the calculation results and the experimental results, the accuracy of the mold, the influence of approximate treatment of thermal physical parameters of BGA and the thickness of copper were analyzed.On the base of existing research and the results of cooper casting, the numerical simulation of continuous casting of Zr48Cu36Ag8Al8BGA is studied. According to the characteristic of our continuous casting machine, the mathematical model of multi-mold is developed. The character of amorphous alloy melt during solidification and the influence of temperature with Zr-based amorphous had been analyzed. Through application of large-scale general-purpose finite element analysis software ANSYS, under the equations of heat transfer, initial conditions and boundary conditions, two-dimensional finite element model were established and the temperature field of the continuous casting process of Zr48Cu36Ag8Al8had been calculated. BGA had been calculated. The temperature field distribution contour and temperature-time curve of the main point during solidification were acquired.The simulation results of Zr48Cu36Ag8Al8BGA solidification process show that:in the multi-mold, the cooper mold with water made the main cooling effect and the graphite mold made little; among the casting parameters, pour temperature, cooling water flow rate and casting speed all made influence of the casting result. In order to meet the amorphous formation conditions, these parameters were discussed. At last, with the right parameters, the continuous casting experiments succeed, and the mold was proved correct.