Abstract
A numerical simulation method was used to analyze the solidification process of Zr-based bulk metallic glass (BMG) during the horizontal continuous casting (HCC) process. The large-scale general-purpose finite element analysis software ANSYS was adopted to develop a temperature field model. The variation of temperature field in the specific area at different time was studied. Its accuracy was verified by the experimental results of Zr48Cu36Ag8Al8 bulk metallic glass continuous casting solidification process. The effects of casting parameters include intermittent casting procedure (drawing and stopping), casting speed, pouring temperature and cooling rate. The results show that the optimum casting speed range is 1-2 mm/s, pouring temperature is 1223 K and cooling rate of 10 mm rod casting is 5 L/min respectively. A fully Zr-based bulk metallic glass whose diameter is 10 mm and length has no limitation has been successfully fabricated.
Highlights
For the past two decades, the application of numerical simulation which can help researchers solve sophisticated problems has made significant contributions to materials science and metallurgical industry due to its functions1-5
The thermal stability associated with glass transition, super cooled liquid region and crystallization was examined by differential scanning calorimeter (DSC) at a heating rate of 0.67 K/s
The Optical microstructure were obtained with optical microscopy (OM), the etching for OM observation specimens was made in an aqueous fluoride solution for 5 s at 298 K
Summary
For the past two decades, the application of numerical simulation which can help researchers solve sophisticated problems has made significant contributions to materials science and metallurgical industry due to its functions. A variety of bulk glassy alloys have been developed in lanthanide (Ln)-[11], Mg-[12], Zr-[13,14], Be-[15], Fe-[16], Pd-Cu-[17], Ti-[18], Ni-[19], Co-[16] and Cu-[20] based the systems by various slow cooling producing processes such as copper mold casting and water quenching etc Among these bulk metallic glass systems, Zr-based alloy systems are the most important alloy systems because it conjuncts the achievement of various useful engineering properties with high glass-forming ability. The new continuous casting method can provide a cooling speed as fast as that provided by die mold casting method
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