Microstructures and properties of Al0.3CoCrFeNiMnx high-entropy alloys

Manufacturing Methods, Microstructural and Mechanical Properties Evolutions of High-Entropy Alloys: A Review

“…The variation of the atomic fraction of some element(s) in HEAs influences much on mechanical behavior. For instance, The UTS of CoCrFeNiTa 0.4 HEA exhibited more value compared to CoCrFeNiTa 0.75 HEA [102] likewise, Al 0.3 CoCrFeNiMn 0.3 has UST of 371MPA more than Al 0.3 CoCrFeNiMn 0.1 which has exhibited UST of 336 MPa [99]. The refractory high entropy alloys (RHEAs) also reduce a slight increase in strength and hardness as the Ti and C volume fraction increased in Ti x NbMoTaW and Mo 0.5 NbHf 0.5 ZrTiC x HEAs respectively [104,105].…”

“…Table 3 was explained that the majority of the researchers tend to use the AM process because of fast productivity where there is no need to do secondary operations to produce the final sample such as the compaction process for producing a green sample or sintering processes to increase the bonding in case of PM route. In contrast, it was found that the MS technique was rarely used in the fabrication of HEAs [95][96][97][98][99][100][101]. Besides, the majority of research studies have concentrated on the microstructure of the alloy and the mechanical properties through either tensile and compressive tests or hardness tests.…”

High entropy Sr((Zr0.94Y0.06)0.2Sn0.2Ti0.2Hf0.2Mn0.2)O3−x perovskite synthesis by reactive spark plasma sintering

“…Although high entropy alloys have been known for several years in the field of metallurgy [1][2][3], high entropy ceramics, in particular oxides, were synthetized only as recently as 2015. Starting with pioneering work by Rost et al [4], this a class of novel ceramics has attracted growing attention in the scientific community.…”

Development and characterisation of new high entropy alloy systems of dual and/or multiple phases

“…On the contrary, when a dual FCC+BCC phase structure is evident (with higher Al content), the yield strength rises up to 830 MPa, mainly due to its near eutectic lamellar morphology and the presence of a BCC structure, while ductility drops to ~20% [86]. In general, the increasing Al content in HEAs leads to an increase in strength, while ductility follows a declining trend [87][88][89][90][91][92][93][94][95], as demonstrated in Figure 4.1. Moreover, many research efforts have demonstrated that in some cases, Al facilitates the formation of intermetallic phases, including Laves, B2 and L12 phases [22,87,96,97].…”

“…Figure 4. 1: The effect of different substitutional elements on the (a) tensile strength, (b) ultimate tensile strength, and (c) ductility of HEAs[87][88][89][90][91][92][93][94][95]. Curves are presented for visual guides of trends.…”