High strength and ductility AlCrFeNiV high entropy alloy with hierarchically heterogeneous microstructure prepared by selective laser melting

A Review of the Selective Laser Melting Lattice Structures and Their Numerical Models

“…[105] For instance, Yao et al demonstrated that SLM AlCrFeNiV HEA exhibits an excellent combination of the ultimate tensile strength (more than 1 GPa) and ductility (%30%) due to the heterogeneous distribution of the dislocation density and the subgrain morphology. [105] Typically, the subgrain boundaries act as soft and stable barriers that prevent dislocation slip, and as the stress increases, the dislocation motion is hindered by the grain boundaries. [105,106] Subsequently, strain hardening occurs due to the dislocation pile up near the grain boundaries.…”

“…[105] Typically, the subgrain boundaries act as soft and stable barriers that prevent dislocation slip, and as the stress increases, the dislocation motion is hindered by the grain boundaries. [105,106] Subsequently, strain hardening occurs due to the dislocation pile up near the grain boundaries. [105] Similarly, Luo et al investigated the formability and properties of dualphase HEA AlCrCuFeNi x (2 ≤ x ≤ 3) fabricated via SLM.…”

“…The hierarchical heterogeneous microstructure of HEAs hinders that motion progressively and results in a better mechanical performance and ductility. [ 105 ] For instance, Yao et al demonstrated that SLM AlCrFeNiV HEA exhibits an excellent combination of the ultimate tensile strength (more than 1 GPa) and ductility (≈30%) due to the heterogeneous distribution of the dislocation density and the subgrain morphology. [ 105 ] Typically, the subgrain boundaries act as soft and stable barriers that prevent dislocation slip, and as the stress increases, the dislocation motion is hindered by the grain boundaries.…”

Research Progress of Titanium-Based High Entropy Alloy: Methods, Properties, and Applications

“…The HEAs had attracted substantial attention due to their excellent properties, such as high strength/hardness, high wear resistance, high fracture toughness, excellent low temperature performance and structural stability, good corrosion resistance, oxidation resistance, etc. (Juan et al, 2015;Xu et al, 2015;Shang et al, 2017;Chen J. et al, 2018;Jin et al, 2018;Qiu, 2018;Sharma et al, 2018;Shuang et al, 2019;Tian et al, 2019;George et al, 2020;Yao et al, 2020). For instance, Prùša et al (2020) investigated the strengthening mechanism of ultrafine-grained CoCrFeNiNb HEA by mechanical alloying and spark plasma sintering that showed ultra-high strength of 2412 MPa and high hardness of 798 ± 9 HV at 1000 • C. Furthermore, researchers have also realized that rapid oxidation under high temperature conditions limits the high-temperature applicability of HEAs.…”

Wear and Corrosion Behaviour of Supersaturated Surface Layers in the High-Entropy Alloy Systems CrMnFeCoNi and CrFeCoNi

“…In recent years, the multi-component alloy concept of high-entropy alloys (HEAs) has received considerable attention [1]. Despite the absence of a main alloy constituent, promising material properties, e.g., high specific strength, high wear resistance and high oxidation and corrosion resistance have been proven [2][3][4]. The demands of superimposed loading require a complex profile of functional surface properties, resulting in a challenge for recent research activities in surface technology [5,6].…”