Group of Cu(Zr)-based BMGs with critical diameter in the range of 12 to 18 mm

A group of Cu(Zr)-based bulk metallic glasses (BMGs) with critical diameter (D_c) in the 12 to 18 mm range have been obtained using copper mould casting. In the Cu-Zr-Y-Al quaternary system, a new record of D_c=14 mm was established for Cu-based compositions, and 16 mm for compositions based on equi-atomic CuZr. Additional partial substitution of Hf for Zr further elevated the D_c to 18 mm at Cu₄₂Zr₄₃Hf_1.5 Y_3.5Al₁₀.