High entropy Ti20Zr20Cu20Ni20Be20 bulk metallic glass

In this letter, we report that a new bulk metallic glass (BMG) of Ti20Zr20Cu20Ni20Be20, with a critical diameter of 3 mm, has been successfully fabricated using copper mold casting method. Different from most reported BMGs which possess one or two main constituents, this newly developed BMG possesses five elements with equal atomic concentration, which has been defined as high entropy alloy. This high entropy bulk metallic glass (HE-BMG) exhibits high fracture strength of 2315 MPa but a brittle behavior. The glass forming ability, mechanical property and phase transformation after annealing of the HE-BMG are discussed in detail. And a way for designing high entropy bulk glassy alloy has been proposed.