Alloy Designs of High-Entropy Crystalline and Bulk Glassy Alloys by Evaluating Mixing Enthalpy and Delta Parameter for Quinary to Decimal Equi-Atomic Alloys

Abstract

The values of mixing enthalpy (¦H mix ) and Delta parameter (¤) were calculated with 73 elements from Miedema's model for multicomponent equi-atomic alloys to investigate the possibilities of the alloys to be formed into high-entropy (H-E) alloys or high-entropy bulk metallic glasses (HE-BMGs). The equi-atomic alloys from about 15 million ( 73 C 5 ) quinary to 621 billion ( 73 C 10 ) decimal systems were evaluated by referring to a ¦H mix ¤ diagram for zones S and B's for H-E alloys with disordered solid solutions and BMGs, respectively, reported by Zhang et al. The results revealed that the number of quinary equi-atomic alloys plotted in zone S is 28405 (³0.19% in 73 C 5 ), whereas those in zones B 1 and B 2 for conventional and Cu-and Mg-based BMGs, respectively, were 1036385 and 21518 (³6.90 and ³0.14%), respectively. This kind of statistical approach using ¦H mix ¤ diagram will lead to finding out unprecedented H-E alloys and HE-BMGs.

Prediction of Face-Centered Cubic Single-Phase Formation for Non-Equiatomic Cr–Mn–Fe–Co–Ni High-Entropy Alloys Using Valence Electron Concentration and Mean-Square Atomic Displacement

“…Fig.3Relationship between the VEC and phase(s) of the HEAs prepared in this study and reported M/HEAs 14,…”

“…13), which are now widely used to describe those of elements in HEAs. Takeuchi et al 14) presented candidates for face-centered cubic (FCC) HEAs by evaluating mixing enthalpy and ¤. Guo and co-workers proposed that the valence electron concentration (VEC) is the most promising parameter that dictates the formation feasibility of FCC, body-centered cubic (BCC), and FCC+BCC phases.…”

High-Entropy Alloys Including 3d, 4d and 5d Transition Metals from the Same Group in the Periodic Table

“…More speci cally, the zone S in a trapezoid shape for disordered HEAs in the δ-ΔH mix diagram is de ned 21) by eqs. (1) and (2), which were also referred to in the authors previous study 22) .…”

Thermodynamics and Chemical Ordering of Liquid Cu-Hf-Ni-Ti-Zr Alloys

“…Recently, so-called high-entropy metallic glasses attracted the attention of materials science researchers. [1][2][3][4][5] Since the quinary and higher-order systems have a very large temperature and composition space, most of which remains experimentally unexplored, methods for rapid screening of promising combinations of elements and compositions have become an important topic in scientific discussion. As a rule, such methods are based on the analysis of the thermodynamic and physical parameters, such as mixing enthalpy, configurational and mismatch entropies, valence electron concentration, and others.…”