Study of Glass Forming Ability of Different Bulk Metallic Glass Alloys

Zr based, Cu-Zr based and equiatomic TiZrHfNiCu metallic glasses have been prepared by suction casting and characterised by using X-Ray Diffraction and Differential Scanning Calorimetry. Fully glassy rods with wide supercooled liquid region (ΔTx) have been obtained at 3 mm diameter for both Zr based and Cu-Zr based alloys while glassy equiatomic TiZrHfNiCu exhibit low ΔTx at 1.5 mm. The glass forming ability for BMG compositions are analysed and characterised using three parameters: atomic size difference (δ), mixing enthalpy (ΔHmix) and mixing entropy (ΔSmix).