Simulation of the Continuous Casting and Cooling Behavior of Metallic Glasses

Abstract

The development of melt spinning technique for preparation of metallic glasses was summarized. The limitations as well as restrictions of the melt spinning embodiments were also analyzed. As an improvement and variation of the melt spinning method, the vertical-type twin-roll casting (VTRC) process was discussed. As the thermal history experienced by the casting metals to a great extent determines the qualities of final products, cooling rate in the quenching process is believed to have a significant effect on glass formation. In order to estimate the ability to produce metallic glasses by VTRC method, temperature and flow phenomena of the melt in molten pool were computed, and cooling rates under different casting conditions were calculated with the simulation results. Considering the fluid character during casting process, the material derivative method based on continuum theory was adopted in the cooling rate calculation. Results show that the VTRC process has a good ability in continuous casting metallic glassy ribbons.

Magnetoelectrics: Three Centuries of Research Heading Towards the 4.0 Industrial Revolution

“…Recent research on ME composites has been focused on the search for new magnetostrictive materials having balanced soft magnetic and magnetostrictive properties. FeBSiC alloys (Metglass) in the form of amorphous ribbons developed by a fast solidification process, allow for fast magnetization and demagnetization, showing high permeability and low coercivity and saturation field [ 60 ].…”

“…Recent research on ME composites has been focused on the search for new magnetostrictive materials having balanced soft magnetic and magnetostrictive properties. FeBSiC alloys (Metglass) in the form of amorphous ribbons developed by a fast solidification process, allow for fast magnetization and demagnetization, showing high permeability and low coercivity and saturation field [60]. Amirov et al [61] proposed a new approach for a ME sandwich structure comprising glasscoated amorphous Fe77.5B15Si7.5 microwires as magnetostrictive layer and PZT as piezoelectric phase with a reported ME coefficient of 100 mV•cm −1 •Oe −1 (Figure 9).…”

Mg-Based Materials with Quasiamorphous Phase Produced by Vertical Twin-Roll Casting Process

“…In our previous studies, we calculated the cooling capacities of two pilot-scale vertical twin-roll casters and determined the effects of strip-casting parameters on microstructure transformation [7,9]. It was found that pouring temperature T p , casing speed v c , and strip thickness δ are the main parameters that influence temperature distribution at the casting zone and the final microstructure of the as-cast strip.…”

“…Results of previous work showed that the high cooling capacity (i.e., maximum cooling rate of 10 3 -10 4 K s −1 [7,8]) of the vertical twin-roll strip casting process makes it possible to produce materials with ultrafine-grained, nanocrystalline, and even amorphous structures. Twin-roll strip casting (TRC) integrates casting and hot rolling into one step and has the merits of shortening the processing time and saving energy.…”