Heat treatment induced microstructural evolution and strength enhancement of Al–Cr–Fe–Ni–V high-entropy alloy fabricated by laser powder bed fusion

Liu, Ziwei; Tan, Zhen; Yao, Haili; Chen, Chao; Zhou, Zheng; Xue, Yunfei; Shao, Wei; Guo, Xingye; Yao, Haihua; Chen, Lijia; Li, Cui; He, Dingyong

doi:10.1016/j.msea.2022.144348

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…Introducing L 12 phases improves HEAs high hardness and provides excellent corrosion resistance. An increase in annealing temperature from 1173 K to 1473 K caused an increase in volume fraction and nanoprecipitation along the grain boundary, which led to a harder-to-achieve hardness [ 22 ]. AlFeCuNiMgZn HEAs have produced powder metallurgy routes, and their properties were assessed using a scanning electron microscope (SEM).…”

Section: Microstructural Effects Of Heasmentioning

confidence: 99%

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Development of high entropy alloys (HEAs): Current trends

2024

Heliyon

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Section: Microstructural Effects Of Heasmentioning

confidence: 99%

“…Nanoprecipitation forms during the heat treatment process. Annealing at a high temperature does not result in coarse grain formation, whereas it forms fine grains [ 22 ]. Medical applications of hafnium (Hf) in bio-HEAs are significant, and Hf contributes to lower magnetic sustainability, which is suitable for MRI carriers [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Development of high entropy alloys (HEAs): Current trends

2024

Heliyon

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“…Actually, the alloy composition at the molten pool/substructure boundary was slightly different from that inside the molten pool/substructure. The HIP treatment promoted atomic diffusion, which led to a homogenization of segregation and the elimination of the molten pool boundaries and substructures [40] . Furthermore, there is no increase in the grain size of HEAs during HIP treatment.…”

Section: Microstructural Evolution During Hip Treatmentmentioning

confidence: 99%

Hot isostatic pressing induced precipitation strengthening at room and high temperature of Ni-Fe-Cr-Al-V high-entropy alloy manufactured by laser powder bed fusion

Ziwei,

Zhen,

Zheng

et al. 2024

Microstructures

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The highly adjustable properties of high-entropy alloys (HEAs) offer great potential for developing superior materials for critical structural applications in high-temperature conditions. In this study, Ni-Fe-Cr-Al-V HEA was manufactured by laser powder bed fusion, which has a unique microstructure composed of dislocation substructure and Face-centered cubic + L12 coherent structure and achieves the desired strength-ductility combination. Hot isostatic pressing post-treatment was applied on the laser powder bed fusion-processed HEA to further improve the relative density and optimize the mechanical properties. During the hot isostatic pressing process, the precipitation of L12 and B2 phases can be ascribed to the precipitation modes dominated by continuous precipitation and discontinuous precipitation, respectively. With the tensile deformation temperature increasing from 773-1,173 K, the softening degree of HEA increases continuously, and the dominant deformation mechanism evolves from intragranular dislocation slip to grain boundary sliding. At temperatures below 773 K, precipitation strengthening significantly improves tensile strength and ductility. At 1,173 K, the grain boundary strength decreases and grain boundary area increases, which promotes grain boundary sliding and contributes to plastic deformation, resulting in significant softening.

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