Pd20Pt20Cu20Ni20P20 high-entropy alloy as a bulk metallic glass in the centimeter

► The first high-entropy bulk metallic glass (HE-BMG) with perfect equi-atomicity. ► The concept of HE alloy determines the composition of BMGs. ► Pd20Pt20Cu20Ni20P20 HE-BMG has a prototype of Pd40Ni40P20 BMG. Pd20Pt20Cu20Ni20P20 HE-BMG exhibits a 10-mm critical diameter. ► This work opens a new scientific field of HE-BMG.