Laser-aided additive manufacturing of high entropy alloys: Processes, properties, and emerging applications

Corrosion engineering boosting bulk Fe50Mn30Co10Cr10 high-entropy alloy as high-efficient alkaline oxygen evolution reaction electrocatalyst

High-entropy alloy (HEA) coatings are of great importance in the fabrication of wear resistance materials. HEA coatings containing ceramic particles as reinforcement phase usually have better wear performance. In this study, AlCoCrFeNi(TiN)x (x: molar ratio; x=0, 0.2, 0.4, 0.6, 0.8, 1.0) HEA coatings were fabricated on Q235 steel by plasma spray first and then subjected to laser remelting. The experimental results confirm that plasma spray together with post laser remelting could result in the in-situ formation of TiN-Al2O3 ceramic particles and cuboidal B2 phase in the AlCoCrFeNi(TiN)x HEA coatings. The in-situ TiN-Al2O3 and nano-cuboidal B2 precipitation phase strengthened the coatings and improved their wear-resistance properties. Due to the dispersion of hard phase and nano-particles resulting from second heating, the microhardness of the AlCoCrFeNi(TiN) coatings significantly increased from 493 to 851 HV after laser remelting. For the same reasons, the wear-resistance performance was also significantly promoted after laser remelting. 

Strengthening behavior of AlCoCrFeNi(TiN) high-entropy alloy coatings fabricated by plasma spraying and laser remelting

Additive manufacturing of metallic glasses and high-entropy alloys: Significance, unsettled issues, and future directions

• Giant strengthening in SLMed CoCrNi alloys by subsequent deformation and annealing. • CoCrNi alloy delivers yield strength of 1161.6 MPa and strain of 31.5%. • The refined hierarchical microstructure and lattice defects result in high strength. The selective laser melting (SLM) with subsequent cold rolling and annealing is used to produce high-density lattice defects and grain refinement in the CoCrNi medium-entropy alloys (MEAs). The superior comprehensive mechanical properties have been achieved in the as-SLMed CoCrNi alloy after rolling and annealing. The as-SLMed alloys delivered the yield strength of 693.4 MPa, the ultimate tensile strength of 912.7 MPa and the fracture strain of 54.4%. After rolling with 70% reduction in thickness and annealing at 700 °C for 2 h. the yield strength, ultimate tensile strength and fracture strain reached 1161.6 MPa, 1390.8 MPa and 31.5%, respectively. The exceptional strength-ductility synergy is mainly attributed to the refined hierarchical microstructures with coarsening grains at a level of 30 µm and ultrafine grains at a level of 1 µm, and the heritage of dislocation-formed sub-grains and other lattice defects. This investigation demonstrates that the SLM with subsequent rolling and annealing is beneficial to fabricate high strength and ductile MEAs with single face-centered cubic (fcc) structure. 

Exceptional strength-ductility synergy of additively manufactured CoCrNi medium-entropy alloy achieved by lattice defects in heterogeneous microstructures

Fabricating antibacterial CoCrCuFeNi high-entropy alloy via selective laser melting and in-situ alloying

Ti–6Al–4V alloy samples with two bi-lamellar microstructures were prepared by cost-effective thermomechanical powder consolidation and two inter-critical annealing treatments; one comprising of annealing at 900 °C followed by air cooling (900-AC alloy) and the other comprising of annealing at 910 °C followed by water quenching and aging (910-Q&A alloy), respectively. Both bi-lamellar microstructures encompass lamellae of primary α phase and β transformed structure which consists of ultrathin secondary α lamellae and β thin layers. Thanks to the higher Al concentration in the primary α lamellae associated with the higher annealing temperature and finer scale of βt structure lamellae, the α and βt lamellae of the 910-Q&A alloy exhibit a higher nano-hardness than that of the 900-AC alloy (5.4 and 4.6 GPa vs. 4.5 and 4.3 GPa) as well as a larger difference in nano-hardness between the α and βt lamellae (0.8 vs. 0.2 GPa). These microstructural and nano-hardness differences lead to a significant enhancement of the yield strength of the 910-Q&A alloy by 200 MPa compared to the 900-AC alloy with almost no decrease of tensile ductility. Quantitative analysis indicates that the hardening of α and βt lamellae accounted for approximately 35% and 28% of the total strength increment, respectively, while the heterostructure induced hardening associated with the inhomogeneity between the α and βt lamellae accounts for approximately 37% of the strength increment. Interestingly, the significantly higher flow stress of the 910-Q&A alloy during tensile deformation induces a significant higher degree of trans-lamellar twinning which is believed to be responsible for mitigating the strain localization and maintaining the good tensile ductility despite of a higher flow stress.

Strength enhancement of a bi-lamellar PM Ti–6Al–4V alloy without sacrificing ductility by Al partitioning and twinning-induced plasticity effect

Growth kinetics of interfacial reaction layer products between cubic boron nitride and Cu-Sn-Ti active filler metal

WITHDRAWN: Desulfurization Behavior of Copper Containing Pig Iron Obtained From the Copper Smelting Slag

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Papers

Fabricating antibacterial CoCrCuFeNi high-entropy alloy via selective laser melting and in-situ alloying

Strength enhancement of a bi-lamellar PM Ti–6Al–4V alloy without sacrificing ductility by Al partitioning and twinning-induced plasticity effect

Growth kinetics of interfacial reaction layer products between cubic boron nitride and Cu-Sn-Ti active filler metal

WITHDRAWN: Desulfurization Behavior of Copper Containing Pig Iron Obtained From the Copper Smelting Slag