Microstructures and room temperature tensile properties of as-cast and directionally solidified AlCoCrFeNi2.1 eutectic high-entropy alloy

Wang, Lei; Yao, Chengli; Shen, Jun; Zhang, Yunpeng; Wang, Tao; Ge, Yuhui; Gao, Lina; Zhang, Guojun

doi:10.1016/j.intermet.2019.106681

Cited by 84 publications

(23 citation statements)

References 46 publications

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“…It shows that directional solidification can effectively improve the plasticity of the CoCrCuFeNiTi 0.8 alloy. This similar result is also reported for the DS AlCoCrFeNi 2.1 eutectic high-entropy alloy [ 32 ]. The good combination of strength and plasticity is obtained, and the machinability of the alloy is improved.…”

Section: Resultssupporting

confidence: 90%

Microstructure Evolution and Mechanical Properties of FeCoCrNiCuTi0.8 High-Entropy Alloy Prepared by Directional Solidification

Huang

et al. 2020

Entropy

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A CoCrCuFeNiTi0.8 high-entropy alloy was prepared using directional solidification techniques at different withdrawal rates (50 μm/s, 100 μm/s, 500 μm/s). The results showed that the microstructure was dendritic at all withdrawal rates. As the withdrawal rate increased, the dendrite orientation become uniform. Additionally, the accumulation of Cr and Ti elements at the solid/liquid interface caused the formation of dendrites. Through the measurement of the primary dendrite spacing (λ1) and the secondary dendrite spacing (λ2), it was concluded that the dendrite structure was obviously refined with the increase in the withdrawal rate to 500 μm/s. The maximum compressive strength reached 1449.8 MPa, and the maximum hardness was 520 HV. Moreover, the plastic strain of the alloy without directional solidification was 2.11%, while the plastic strain of directional solidification was 12.57% at 500 μm/s. It has been proved that directional solidification technology can effectively improve the mechanical properties of the CoCrCuFeNiTi0.8 high-entropy alloy.

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Section: Resultssupporting

confidence: 90%

Microstructure Evolution and Mechanical Properties of FeCoCrNiCuTi0.8 High-Entropy Alloy Prepared by Directional Solidification

Huang

et al. 2020

Entropy

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“…During tensile deformation, the harder B2 phase is barely deformed whereas the softer FCC phase becomes stretched and gradually becomes thinner. The existence of tearing testifies to the significant necking in the soft FCC phase due to its good ductility [58]. With further deformation, the soft FCC phase becomes sufficiently hardened and the initially harder B2 phase starts to undergo more deformation.…”

Section: Fracture Characteristics In Tensile Testingmentioning

confidence: 99%

Evidence for a phase transition in an AlCrFe2Ni2 high entropy alloy processed by high-pressure torsion

Liu

Ding

Huang

et al. 2021

Journal of Alloys and Compounds

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“…We believe this deviation can be attributed to both the atom probe tomography method of quantification in Gaos's study which is sensitive to local fluctuations and a different method of preparation of the specimens. Wang et al published (Wang et al, 2020). As can be deduced from these results, the BCC-B2 phase is rich in Al and Ni, while the FCC phase is rich in Fe, and where applicable Cr, and Co.…”

Section: Directional Solidificationmentioning

confidence: 92%

Microstructure and Mechanical Properties of BCC-FCC Eutectics in Ternary, Quaternary and Quinary Alloys From the Al-Co-Cr-Fe-Ni System

et al. 2020

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This study aimed at understanding the structure and properties of dual-phase eutectics in ternary, quaternary, and quinary alloys of the Al-Co-Cr-Fe-Ni system. The alloys at case were i) Ni 48 Fe 34 Al 18 , ii) Ni 44 Fe 20 Cr 20 Al 16, and iii) Ni 34.4 Fe 16.4 Co 16.4 Cr 16.4 Al 16.4 . Samples in the form of cylindrical bars, diameter 10 mm × 150 mm, were produced by arc melting and suction casting from pure elements (>99.9 wt%). Bridgman solidification at low growth velocity was used to produce additional samples with large eutectic spacing and lamellae thickness of the two phases body-centered cubic (BCC)-B2 and face-centered cubic (FCC) in order to facilitate phase characterization by energy-dispersive X-ray analysis (scanning electron microscopy/energy-dispersive spectroscopy) and nano-indentation. In agreement with thermodynamic calculations, each of the phases was found to be multicomponent and contain all alloying elements in distinct amounts. The mechanical properties of the individual phases were analyzed in relation to their composition using nano-indentation experiments. These measurements revealed some insights into "highentropy effects" and their contribution to the elastoplastic response to indentation loading. Further analysis focused on as-cast as well as heat-treated samples comprising phase fraction measurements, micro-indentation, and miniature testing in three-point bending configuration. For optimum heat treatment conditions, a good balance of strength and ductility was obtained for each of the investigated alloys. Further work is necessary in order to assess their capability as structural materials.

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Microstructures and room temperature tensile properties of as-cast and directionally solidified AlCoCrFeNi2.1 eutectic high-entropy alloy

Cited by 84 publications

References 46 publications

Microstructure Evolution and Mechanical Properties of FeCoCrNiCuTi0.8 High-Entropy Alloy Prepared by Directional Solidification

Microstructure Evolution and Mechanical Properties of FeCoCrNiCuTi0.8 High-Entropy Alloy Prepared by Directional Solidification

Evidence for a phase transition in an AlCrFe2Ni2 high entropy alloy processed by high-pressure torsion

Microstructure and Mechanical Properties of BCC-FCC Eutectics in Ternary, Quaternary and Quinary Alloys From the Al-Co-Cr-Fe-Ni System

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