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

Hongyu Ding; Hengwei Luan; Hengtong Bu; Hongjie Xu; Kefu Yao

doi:10.3390/ma15051669

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

Materials (Basel). 2022 Feb 23;15(5):1669. doi: 10.3390/ma15051669.

Authors

Hongyu Ding^{1

2}, Hengwei Luan², Hengtong Bu², Hongjie Xu², Kefu Yao²

Affiliations

¹ Marine Equipment and Technology Institute, Jiangsu University of Science and Technology, Zhenjiang 212100, China.
² School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.

Abstract

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 Ti_16.7Zr_16.7Nb_16.7Cu_16.7Ni_16.7Be_16.7 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 δ' 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 δ' parameter by similar element substitution/addition would be beneficial for designing high entropy bulk metallic glasses.

Keywords: bulk metallic glass; glass forming ability; high entropy alloy; lattice distortion; similar element substitution/addition.

Grants and funding

National Key Basic Research and Development Program 2016YFB00300500;National Natural Science Foundation of China 51571127 and 51871129; Youth Fund of Jiangsu Natural Science FoundationBK20190979/National Key Basic Research and Development Program;National Natural Science Foundation of China; Youth Fund of Jiangsu Natural Science Foundation