Comparative study of the microstructures and mechanical properties of direct laser fabricated and arc-melted Al x CoCrFeNi high entropy alloys

Additive Manufacturing of High-Entropy Alloys by Laser Processing

“…Comparative study of arc melted and laser beam fabricated Al x CoCrFeNi (x = 0.3, 0.6, and 0.85) HEAs 19 shows similar microstructures for low and high Al content alloys with a strong h001i fiber texture along the direction of solidification. A very first review of HEA coatings fabricated mainly by laser cladding and their application prospects was published by Zhang et al 29 The goal of our experimental work is a comparative study of the microstructure and hardness among HEAs prepared by conventional arc melting with a laser-beam-assisted surface coating technique.…”

“…11 Apart from bulk material consolidation methods such as casting and sintering, HEAs can also be deposited as a surface coating. Various techniques of welding, 9,12 thermal spraying, 13 selective laser melting, 14 direct laser deposition 8,[15][16][17][18] and additive manufacturing [19][20][21][22] are already reported in the literature as experimental methods to produce HEA coatings.…”

Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

“…[30] Compared to EBM and SLM, where pre-alloyed HEA powders are usually required, DLD enables the fabrication of HEAs from elemental powders and easy tailoring of the compositions of the HEAs during the process. [119] Similarly, the influence of Al/Ni ratio on the microstructure and phase formation in the DLDed Al x FeCoCrNi 2-x HEA by Sistla et al [120] It was found that the Al/Ni ratio had a profound effect on the microstructure and phase formation of the fabricated HEA ( Figure 12). Several pioneering investigations have been conducted and reported on the microstructure and phase formation of HEAs fabricated using these metal additive manufacturing techniques.…”

“…Compressive stress-strain curves of the SLMed Zr-based BMG rods, as compared with the as-cast one. For example, three alloys based on Al x CoCrFeNi HEA system with different molar fraction of Al (x ¼ 0.3, 0.6, and 0.85) were successful fabricated using DLD by Joseph et al [119] Three different microstructures FCC, FCC/BCC, and BCC can be produced by varying the Al content, for example, Widmanstatten microstructure was found in the fabricated Al x CoCrFeNi HEA specimens (x ¼ 0.6). [30] Compared to EBM and SLM, where pre-alloyed HEA powders are usually required, DLD enables the fabrication of HEAs from elemental powders and easy tailoring of the compositions of the HEAs during the process.…”

“…[30,[119][120][121][122][123][124] For example, Joseph et al found that the yield strength and ductility of DLDed Al x CoCrFeNi HEAs with different molar fractions of Al (x ¼ 0.3 and 0.85) were similar to their counterparts fabricated using arc melting due to their similar grain size, composition and texture. [30,[119][120][121][122][123][124] For example, Joseph et al found that the yield strength and ductility of DLDed Al x CoCrFeNi HEAs with different molar fractions of Al (x ¼ 0.3 and 0.85) were similar to their counterparts fabricated using arc melting due to their similar grain size, composition and texture.…”