Uniaxial mechanical properties of face-centered cubic single- and multiphase high-entropy alloys

Abstract

Since the high entropy concept was proposed at the beginning of the millennium, the research focus of this alloy family has been wide ranging. The initial search for single-phase alloys has expanded with the aim of improving mechanical properties. This can be achieved by several strengthening mechanisms such as solid-solution hardening, hot and cold working and precipitation hardening. Both single- and multiphase high- and medium-entropy alloys can be optimized for mechanical strength via several processing routes, as is the case for conventional alloys with only one base element, such as steels or Ni-based superalloys. Graphical abstract

Time-Temperature Dependent Short- and Long-Range Structural Transformation in Medium-Entropy Alloys

“…9,10) The lack of experiments on the effect of heat treatment on the formation of short-range ordering has also been noted. 5,6) If short-range ordering is tunable through heat treatment and/or substitution of constituent elements, then the size of atomic scale segregation can be modified. Thus, a detectable long-range ordered phase could be grown.…”

Recent Progress in Our Understanding of Phase Stability, Atomic Structures and Mechanical and Functional Properties of High-Entropy Alloys

“…87) Most alloys in practical structural applications are rarely single-phased but are usually of multi-phased in order to achieve a good balance of mechanical properties. 59,8890) The secondary/tertiary phase is incorporated mainly for strengthening and optimization is made for their microstructures via various processing routes. This is also the case for highentropy alloys for better balanced mechanical properties.…”

“…21,22) The temperature dependence of yield stress of these alloys is well interpreted in terms of thermally-activated dislocation glide, as in conventional solid-solution hardened alloys. 19,20,59) The high strength of these high-entropy alloys must be related to their severely distorted crystal lattice and some models are proposed to correlate the strength with some appropriate parameters that describe the distorted crystal lattices. 6063) MSAD is proposed as a materials parameter to scale the strength of high-entropy alloys 37,63) (Fig.…”

High-entropy materials

“…The article by Inui et al 34 reviews uniaxial mechanical properties of single-and multiphase HEAs with a focus on yield strength, work-hardening behavior and ductility. Fundamental aspects of deformation behavior are discussed by analyzing single-crystal properties.…”