Designing Eutectic High‐Entropy Alloys Containing Nonmetallic Elements

A new pseudo binary strategy to design eutectic high entropy alloys using mixing enthalpy and valence electron concentration

Enhanced strength and ductility in a brittle hypoeutectic high-entropy alloy via spheroidizing annealing

Corrosion behaviors and passive film properties of a newly developed cost-effective AlCrFeNi eutectic high entropy alloy in different corrosive solutions

A new CrFeNi2Al eutectic high entropy alloy system with excellent mechanical properties

Enhanced strength and ductility of Al0.9CoCrNi2.1 eutectic high entropy alloy by thermomechanical processing

Fabricating eutectic high-entropy alloys (EHEAs) via selective laser melting (SLM) presents significant potential for advanced structural applications. This study explores the microstructural evolution of Fe32Cr33Ni29Al3Ti3 EHEAs fabricated by SLM under varying laser powers. Electron backscatter diffraction (EBSD) analysis revealed that samples fabricated at 200 W exhibited approximately 70% face-centered-cubic (FCC) and 30% body-centered-cubic (BCC) phases. In comparison, those processed at 160 W showed an increased FCC fraction of 85% with a corresponding reduction in BCC content. Grain size measurements indicated that BCC grains were consistently finer than their FCC counterparts. Thermal simulations demonstrated that higher laser power produced deeper melt pools and broader temperature gradients. By correlating thermal history with phase diagram data, the spatial variation in BCC content was attributed to the differential residence time in the 1350–1100 °C range. This study represents one of the first attempts to quantitatively link local thermal histories with the evolution of dual-phase (FCC + BCC) microstructures in EHEAs during SLM. The findings contribute to the improved understanding and control of phase formation in complex alloy systems, providing valuable guidance for tailoring SLM parameters to optimize the phase composition and microstructure of EHEAs.

The performance of polycrystalline diamond (PCD) tools largely depends on the adhesion and catalyzing effect of the binder phase. In this study, AlCoCrFeNi2.1 eutectic high-entropy alloy (HEA) was used as a new binder material to synthesize the PCD samples. First-principles calculations showed that the interface strength between HEA and diamond is better than that between cobalt and diamond, suggesting that the HEA/PCD combination has the potential to exhibit better properties than the conventional cobalt/PCD tools. PCD samples with HEA as the binder phase were successfully synthesized using high-pressure and high-temperature conditions of 8.0 GPa and 1500–1700℃. Several key performance indicators, including thermal expansion coefficient, Vickers hardness, transverse rupture strength, compressive strength, and wear resistance were measured to comprehensively evaluate the overall performance of the well-sintered HEA/PCD. The results showed that, compared with conventional cobalt/PCD, the HEA/PCD exhibited a lower thermal expansion coefficient and reduced graphitization of diamond at high temperatures above 920 K. HEA/PCD also demonstrated better mechanical properties than Co/PCD, including higher hardness, and greater transverse rupture strength and compressive strength. Moreover, over the same cutting distance against the granite block, HEA/PCD tools exhibited significantly lower wear loss than Co/PCD, indicating superior wear resistance. This study provides new insights and strategies for the design and optimization of PCD binders and PCD tools.

Remarkable improved strength and ductility in brittle eutectic high-entropy alloy via a novel spheroidization and recrystallization strategy

Effect of cooling rate and Nb addition on the strengthening in eutectic CoCr1.3FeMnNi0.7Nbx (0 ≤ x ≤ 0.45) high entropy alloys comprising of low stacking fault energy FCC phase

A cost-effective eutectic high entropy alloy with an excellent strength–ductility combination designed by VEC criterion

New insight into tailorable eutectic high entropy alloys with remarkable strength–ductility synergy and ample shaping freedom fabricated using laser powder bed fusion

ABSTRACTDamping is the ability to reduce the energy produced by vibrations in a system. In this research, the eutectic high-entropy alloys (EHEAs), AlCoxCrFeNi2.1 (x = 0.7, 1.0 and 1.5), are firstly studied for their damping behaviour. EHEA is a promising concept of high-entropy alloys. By combining the advantages of eutectic phases and HEAs, the EHEAs show better liquidity, castability and compositional homogeneity than conventional HEAs. Meanwhile, it can strike a great balance in mechanical strength and tensile ductility owing to the lamellar structures. The microstructures and crystal structure of two near-EHEAs are also studied. AlCo0.7CrFeNi2.1 is a hypo-eutectic HEA with primary body-centred cubic phases. AlCo1.5CrFeNi2.1 is a hyper-eutectic HEA with primary face-centred cubic phases. The results showed that these eutectic and near-eutectic alloys gave rise to greater tan δ values than conventional dual-phase HEAs, which might be attributed to their lamellar structures.

Phase selection and mechanical properties of directionally solidified AlCoCrFeNi2.1 eutectic high-entropy alloy

A novel corrosion resistant NiFeCrAlTi eutectic high entropy alloy with high strength and ductility

A novel Co-free Al0.75CrFeNi eutectic high entropy alloy with superior mechanical properties