A new CoFe-based bulk metallic glasses with high thermoplastic forming ability

The (Co0.5Fe0.5)62Nb6M2B30 (M = Er, Tb, Y or Dy) bulk metallic glasses with a large supercooled liquid region up to 130 K are reported. Their high processing ability was demonstrated by simple microreplication experiments. In addition, this bulk metallic glass system exhibits a high fracture strength of up to 4750 MPa and a Vickers hardness of up to 1258, together with good soft-magnetic properties. Combining good mechanical properties with high thermoplastic forming ability, these bulk metallic glasses have potential for use in engineering applications.