Role of copper addition on properties of bulk metallic glass materials

In this paper the role of copper addition has been studied to examine thermal, mechanical, magnetic and corrosion properties of the Fe43Co22Ni7B19Si5Nb4 bulk metallic glass alloy material. It is found that the copper addition in alloys exhibited low supercooled liquid region as compared to copper-free alloy. It is observed that microhardness was reduced in Cu-containing alloy with generation of shear bands along faces of micro indent impression while in Cu-free alloy straight and long microcracks appeared at the indent corners indicating its brittle behavior. The magnetic properties slightly decrease with Cu addition however the corrosion resistance of Cu-containing alloy showed superior properties indicating commercial benefits in aggressive environment.