Papers by Keyword: Copper Mold Casting

Abstract: Magnesium-based bulk metallic glasses (BMGs) present fabrication challenges due to their low glass-forming ability and high critical cooling rate. Copper mold casting, with its high thermal conductivity, is the most viable method for producing Mg-based BMGs, though amorphous diameters typically remain under 10 mm, limiting practical applications. This study uses FLOW-3D CAST simulations to analyze heat transfer and solidification behavior in two copper mold designs. The simulations evaluate flow uniformity, thermal dissipation, and cooling rate distribution, aiming to correlate cooling rate with achievable BMG diameter. The results provide design guidance for casting larger amorphous Mg components.

Abstract: Researches and developments were carried out for obtaining of bulk metallic glass (BMG) from the Fe-Cr-Ni-Si-B system. The used processing methods were copper mold casting and melt spinning method. The resulted materials are in form of sheets with sizes of 69.7 x 64 x 3/1.5 mm and of strips with thickness less than 50 microns, which were obtained by varying the melt spin technological parameters. The both processing variants are not suitable for obtaining such of alloy in bulk metallic glass form. Adding of zirconium to this alloy produces bulk metallic glasses only for the melt spin products. The DSC analysis emphases that the zirconium modified alloy processed by melt spinning method exhibits a high glass forming ability (GFA).

Abstract: Bulk Fe₇₃Nb₃Al₂Ge₂P₉C₆B₄Si₁ metallic glass with the diameter of 2 mm was prepared by copper mold casting. The Fe-based metallic glass exhibits good magnetic properties with high saturation magnetization and low saturated magnetostriction. The saturation magnetization and coercive force remains almost unchanged with annealing temperature below the crystallization temperature. The crystallization leads to the decrease in the softness of magnetic properties. The Fe-based glass exhibits a good correspondence between large glass-forming ability and good soft magnetic properties.

Abstract: By copper mold casting, a bulk Fe₆₃Co₇Nb₄Zr₆B₁₉Si₁ metallic glass was synthesized in the diameter of 2mm. The Fe-based amorphous alloy exhibits soft ferromagnetic characteristics with a saturation magnetization of 77Am²/kg and a saturated magnetostriction of 25.4×10^-6. The saturation magnetization is reduced while the coercive force is slightly lowered by annealing treatment below the crystallization temperature. The devitrification gives rise to a remarkable enhancement both in saturation magnetization and coercive force.

Abstract: There are 7 Fe-based amorphous alloys fabricated by advanced copper mold casting after careful attempt. The electrochemical property of amorphous alloys was studied for investigating the physics characteristic and properties applied in practice further. The result is as follows: Amorphous alloys exhibit good corrosion resistance in NaCl solution and HCl solution, and the addition of Cr and Mo can improve the passivating ability.

Abstract: It’s well known that bulk Fe-based amorphous alloy is difficult to fabricate, but we develop low price Fe-based amorphous alloys applied in practice after systemic analyzing and considering the cost demand of the application. Finally, there are 7 Fe-based amorphous alloys fabricated by advanced copper mold casting after careful attempt.