Effects of Boron Content on microstructure and mechanical properties of AlFeCoNiBx High Entropy Alloy Prepared by vacuum arc melting

Hou, Lili; Hui, Jiatao; Yao, Yuhong; Chen, Jian; Liu, Jiangnan

doi:10.1016/j.vacuum.2019.03.019

Cited by 59 publications

(16 citation statements)

References 40 publications

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“…The addition of B caused strong lattice distortion because the atomic radius of B largely differs from those of the remaining elements in the powder. According to Gibbs free energy theory, as the alloy solidifies, the B atoms are discharged from the crystal interior to reduce the lattice distortion energy of the alloy [16]. Although rapid cooling reduces the diffusion time of the solute, the small-sized B tended to be enriched at the grain boundary, causing constitutional undercooling at the grain boundary and promoting the growth of primary and even secondary dendrite arms [16].…”

Section: Resultsmentioning

confidence: 99%

“…According to Gibbs free energy theory, as the alloy solidifies, the B atoms are discharged from the crystal interior to reduce the lattice distortion energy of the alloy [16]. Although rapid cooling reduces the diffusion time of the solute, the small-sized B tended to be enriched at the grain boundary, causing constitutional undercooling at the grain boundary and promoting the growth of primary and even secondary dendrite arms [16]. In addition, increasing the amount of excessive B in the crystallization process impels the discharge of Cr in the BCC phase into the liquid phase, achieving the composition requirements of boride with a topologically close-packed phase.…”

Section: Resultsmentioning

confidence: 99%

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Microstructure and wear resistance of the laser-cladded Al_0.8CrFeCoNiCu_0.5B_x high-entropy alloy coating on aluminum

Shi

2020

Mater. Res. Express

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Coatings with excellent mechanical properties are difficult to prepare on the aluminum alloy surfaces by laser surface engineering because of the low melting point and active chemical properties of aluminum (Al). Based on the unique entropy effect of a high-entropy alloy, we suppress the cracks in the cladding layer caused by the dilution ratio of the substrate, obtaining coatings exhibiting excellent wear resistance. The Al 0.8 CrFeCoNiCu 0.5 B x coating exhibited a BCC1+BCC2+FCC phase when the x0.1. When x0.2, boride was formed in the Al 0.8 CrFeCoNiCu 0.5 B x coatings, and it became the main phase of the Al 0.8 CrFeCoNiCu 0.5 B 0.3 and Al 0.8 CrFeCoNiCuB 0.4 coatings; however, no Alrich intermetallic compound with a complex phase structure was formed. When 0x0.3, the bonding strengths of the Al 0.8 CrFeCoNiCu 0.5 B x coatings were 70.6-176.2 MPa. An increase in the boron content increased the hardness of all the coatings, except the Al 0.8 CrFeCoNiCu 0.5 B 0.3 coating.The hardness was 479-705 HV (6-9 times that of the substrate). The wear rate of the coating ranged from 1.50×10 −7 to 1.19×10 −5 mm 3 /Nm, which was only 0.01%-5.43% that of the substrate. The Al 0.8 CrFeCoNiCu 0.5 B 0.2 coating exhibited the highest resistance to wearing, and its wear mechanism was identified as abrasive wear.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Microstructure and wear resistance of the laser-cladded Al_0.8CrFeCoNiCu_0.5B_x high-entropy alloy coating on aluminum

Shi

2020

Mater. Res. Express

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“…Arc melting is currently one of the most commonly used preparation methods for the production of bulk HEAs ( Baldenebro-Lopez et al, 2015 ; Chen Y. et al, 2018 ; Hou et al, 2019 ; Zhang J. et al, 2020 ). The process involves pouring a certain proportion of metallic materials into the tongs.…”

Section: Fabrication Methods Of Titanium Based Heasmentioning

confidence: 99%

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

Liu

et al. 2020

Front. Bioeng. Biotechnol.

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With the continuous progress and development in the biomedicine field, metallic biomedical materials have attracted the considerable attention of researchers, but the related procedures need to be further developed. Since the traditional metal implant materials are not highly compatible with the human body, the modern materials with excellent mechanical properties and proper biocompatibility should be developed urgently in order to solve any adverse reactions caused by the long-term implantations. The advent of the high-entropy alloy (HEA) as an innovative and advanced idea emerged to develop the medical implant materials through the specific HEA designs. The properties of these HEA materials can be predicted and regulated. In this paper, the progression and application of titanium-based HEAs, as well as their preparation and biological evaluation methods, are comprehensively reviewed. Additionally, the prospects for the development and use of these alloys in implant applications are put forward.

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“…Several other studies have added boron to various HEAs including to Al 0. [55], and AlFeCoNi [56]. All resulted in the formation of second phases.…”

Section: Boron Dopingmentioning

confidence: 99%

Interstitials in f.c.c. High Entropy Alloys

Baker

2020

Metals

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The effects of interstitials on the mechanical properties of single-phase f.c.c. high entropy alloys (HEAs) have been assessed based on a review of the literature. It is found that in nearly all studies, carbon increases the yield strength, in some cases by more than in traditional alloys. This suggests that carbon can be an excellent way to strengthen HEAs. This strength increase is related to the lattice expansion from the carbon. The effects on other mechanical behavior is mixed. Most studies show a slight reduction in ductility due to carbon, but a few show increases in ductility accompanying the yield strength increase. Similarly, some studies show little or modest increases in work-hardening rate (WHR) due to carbon, whereas a few show a substantial increase. These latter effects are due to changes in deformation mode. For both undoped and carbon doped CoCrFeMnNi, the room temperature ductility decreases slightly with decreasing grain size until ~2–5 µm, below which the ductility appears to decrease rapidly. The room temperature WHR also appears to decrease with decreasing grain size in both undoped and carbon-doped CoCrFeMnNi and in nitrogen-doped medium entropy alloy NiCoCr, and, at least for the undoped HEA, shows a sharp decrease at grain sizes <2 µm. Interestingly, carbon has been shown to almost double the Hall–Petch strengthening in CoCrFeMnNi, suggesting the segregation of carbon to the grain boundaries. There have been few studies on the effects of other interstitials such as boron, nitrogen and hydrogen. It is clear that more research is needed on interstitials both to understand their effects on mechanical properties and to optimize their use.

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Effects of Boron Content on microstructure and mechanical properties of AlFeCoNiBx High Entropy Alloy Prepared by vacuum arc melting

Cited by 59 publications

References 40 publications

Microstructure and wear resistance of the laser-cladded Al_0.8CrFeCoNiCu_0.5B_x high-entropy alloy coating on aluminum

Microstructure and wear resistance of the laser-cladded Al_0.8CrFeCoNiCu_0.5B_x high-entropy alloy coating on aluminum

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

Interstitials in f.c.c. High Entropy Alloys

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Effects of Boron Content on microstructure and mechanical properties of AlFeCoNiBx High Entropy Alloy Prepared by vacuum arc melting

Cited by 59 publications

References 40 publications

Microstructure and wear resistance of the laser-cladded Al0.8CrFeCoNiCu0.5Bx high-entropy alloy coating on aluminum

Microstructure and wear resistance of the laser-cladded Al0.8CrFeCoNiCu0.5Bx high-entropy alloy coating on aluminum

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

Interstitials in f.c.c. High Entropy Alloys

Contact Info

Product

Resources

About

Microstructure and wear resistance of the laser-cladded Al_0.8CrFeCoNiCu_0.5B_x high-entropy alloy coating on aluminum

Microstructure and wear resistance of the laser-cladded Al_0.8CrFeCoNiCu_0.5B_x high-entropy alloy coating on aluminum