Designing High Entropy Bulk Metallic Glass (HE-BMG) by Similar Element Substitution/Addition

In this paper, we report that two newly designed high entropy bulk metallic glasses (HE-BMGs), Ti20Hf20Cu20Ni20Be20 with a critical diameter of 2 mm, and Ti16.7Zr16.7Nb16.7Cu16.7Ni16.7Be16.7 with a critical diameter of 1.5 mm, can be fabricated by copper mold casting method. These newly developed HE-BMGs exhibited a high fracture strength over 2300 MPa. The glass forming ability and atomic size distribution characteristics of the HE-BMGs are discussed in detail. Moreover, a parameter delta ' was proposed to evaluate the atomic size distribution characteristics in different HEAs. It showed that this new parameter is closely related to the degree of lattice distortion and phase selection of high-entropy alloys. Adjusting the value of delta ' parameter by similar element substitution/addition would be beneficial for designing high entropy bulk metallic glasses.

Automated summary

This paper reports on the successful fabrication of two newly designed high entropy bulk metallic glasses (HE-BMGs) using the copper mold casting method. These HE-BMGs exhibited a high fracture strength and their glass forming ability and atomic size distribution characteristics were discussed in detail. Furthermore, a parameter δ' was proposed to evaluate the atomic size distribution in different high-entropy alloys, and adjusting this parameter could be beneficial for designing HE-BMGs.