Excellent glass forming ability and plasticity in high entropy Zr 20Ti 20Hf 20M 20Be 20 (M?=?Cu, Ni, Co) alloys

摘要

We reported here the studies of a series of Zr20Ti20Hf20M20Be20(M?=?Cu, Ni and Co) quinary high entropy bulk metallic glasses. Glasses with critical diameters (Dc) of 3?mm, 8?mm and 5?mm, respectively has been successfully fabricated by copper mold casting. Strikingly, a plastic strain of 11.6% is achieved in the Zr20Ti20Hf20Cu20Be20metallic glass. The dynamic fragility the Zr20Ti20Hf20Cu20Be20alloy is determined from calorimetric measurements. The excellent plasticity is explained to be attributed to relatively higher fragility.