Amorphous Forming Ability, Thermal Stability, Viscosity and Thermoplastic Formability of (Cu43Zr48Al9)100-xREx (x=0-4, RE: Y,Gd) Alloy

The width, deformation and viscosity change of super cooled liquid region of (Cu43Zr48Al9)100-xREx(x=0-4, RE: Y, Gd) bulk metallic glasses in super cooled liquid region are systemically investigated by thermoanalysis tests. By analyzing the width, deformation and viscosity of super cooled liquid region, the amorphous forming ability, thermal stability and thermoplastic forming ability of (Cu43Zr48Al9)100-xREx (x=0-4, RE: Y, Gd) in the super cooled liquid region were obtained. It was found that the addition of rare earth elements Y and Gd improved amorphous forming ability, thermal stability, viscosity and deformation, however, by adding rare earth Y, Gd, viscosity and ΔT was no obvious connection. With the increase of Y content, the thermal stability first increases and then decreases, the viscosity decreases firstly, then increases and decreases finally, the deformation increases firstly and then decreases, it preliminary reveals the relationship between viscosity and amorphous forming ability. (Cu43Zr48Al9)98Y2 amorphous alloy has better thermal stability and thermoplastic formability by adding a small amount of Y.