Effect of V content on microstructure and mechanical properties of the CoCrFeMnNiVx high entropy alloys

Stepanov, Nikita; Shaysultanov, D.G.; Салищев, Г. А.; Tikhonovsky, М.А.; Oleynik, E.E.; Tortika, A.S.; Senkov, O.N.

doi:10.1016/j.jallcom.2014.12.157

Cited by 324 publications

(85 citation statements)

References 46 publications

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“…It has been revealed that the microstructure of the AlxCoCrFeNi HEAs evolved from a single A1, to A1 + B2, and B2 + A2 structures with increases in Al content [12]. Moreover, the alloying element V can also cause intermetallic phase formation in the CoCrFeMnNi and CoCrFeNi HEA systems [26].…”

Section: Discussionmentioning

confidence: 99%

The Al Effects of Co-Free and V-Containing High-Entropy Alloys

Xia

Yang

Chen

et al. 2017

Metals

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Abstract:In this study, five-component high-entropy alloys (HEAs) Al x CrFeNiV (where x denotes the molar ratio, x = 0, 0.1, 0.3, 0.5, 0.75, 1, and 1.5) were prepared using an arc-melting furnace. The effects of the addition of the Al on the crystal structures were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Also, two non-equiatomic ratio HEAs, Al x CrFeNiV (x = 0.3, and 0.5), were systematically studied through the use of various characterization methods in the as-cast state. The Al 0.3 CrFeNiV alloy displayed typical duplex body-centered cubic (BCC) structures, including disordered BCC (A2), and NiAl-type ordered BCC (B2) phases. Meanwhile, in regard to the Al 0.5 CrFeNiV alloy, this alloy was found to contain an unknown phase which was enriched in Cr and V, as well as the coherent A2/B2 phases. Both of these alloys displayed very high yield and fracture strengths. However, their compression fracture strains were approximately 10%. Also, the fracture surfaces showed mainly cleavage fracture modes.

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Section: Discussionmentioning

confidence: 99%

The Al Effects of Co-Free and V-Containing High-Entropy Alloys

Xia

Yang

Chen

et al. 2017

Metals

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“…The produced ingots of the CoCrFeMnNi alloy had dimensions of about 6 × 15 × 60 mm 3 . Homogenization annealing was carried out at 1000 • C for 24 h [15,16]. Prior to homogenization, the samples were sealed in vacuumed (10 −2 Torr) quartz tubes filled with titanium chips to prevent oxidation.…”

Section: Methodsmentioning

confidence: 99%

Evolution of Microstructure and Mechanical Properties of a CoCrFeMnNi High-Entropy Alloy during High-Pressure Torsion at Room and Cryogenic Temperatures

Zherebtsov

Stepanov

Ivanisenko

et al. 2018

Metals

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High-pressure torsion (HPT) is applied to a face-centered cubic CoCrFeMnNi high-entropy alloy at 293 and 77 K. Processing by HPT at 293 K produced a nanostructure consisted of (sub)grains of~50 nm after a rotation for 180 • . The microstructure evolution is associated with intensive deformation-induced twinning, and substructure development resulted in a gradual microstructure refinement. Deformation at 77 K produces non-uniform structure composed of twinned and fragmented areas with higher dislocation density then after deformation at room temperature. The yield strength of the alloy increases with the angle of rotation at HPT at room temperature at the cost of reduced ductility. Cryogenic deformation results in higher strength in comparison with the room temperature HPT. The contribution of Hall-Petch hardening and substructure hardening in the strength of the alloy in different conditions is discussed.

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“…[1,2]. It is widely used for semiconductor doping in micro-and nanoelectronics, medicine [3,4], space, chemical and aviation industries [5][6][7][8][9]. The main advantages of ion implantation are preservation of sample sizes, locality (small projective path), high reproducibility, absence of problems with adhesion etc.…”

Section: Introductionmentioning

confidence: 99%

“…The main advantages of ion implantation are preservation of sample sizes, locality (small projective path), high reproducibility, absence of problems with adhesion etc. [7][8][9][10][11][12][13][14][15]. In order to improve the properties of metals, alloys and ceramics, it is necessary to use high doses of ion implantation, from typically 5Á10 16 up to 5x10 17 cm À2 [16].…”

Section: Introductionmentioning

confidence: 99%

“…A new class of materials -high-entropy alloys (HEA), which consist of at least 5 atoms with atomic content from 5 to 35 at% -are under great interest nowadays due to their exceptional wealth of physical-mechanical characteristics [8][9][10][11]13,12,[16][17][18][19][20][21][22]. Several works have been performed so far to obtain a comprehensive understanding of the effect of constitutive elements on the microstructure, phase composition and mechanical properties of HEA [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanostructured multielement (TiHfZrNbVTa)N coatings before and after implantation of N+ ions (1018cm−2): Their structure and mechanical properties

Pogrebnjak

Бондар

Borba

et al. 2016

Nuclear Instruments and Methods in Physics Research Section B:

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a b s t r a c tMultielement high entropy alloy (HEA) nitride (TiHfZrNbVTa)N coatings were deposited by vacuum arc and their structural and mechanical stability after implantation of high doses of N + ions, 10 18 cm À2 , were investigated. The crystal structure and phase composition were characterized by X-ray diffraction (XRD) and Transmission Electron Microscopy, while depth-resolved nanoindentation tests were used to determine the evolution of hardness and elastic modulus along the implantation depth. XRD patterns show that coatings exhibit a main phase with fcc structure, which preferred orientation varies from (1 1 1) to (2 0 0), depending on the deposition conditions. First-principles calculations reveal that the presence of Nb atoms could favor the formation of solid solution with fcc structure in multielement HEA nitride. TEM results showed that amorphous and nanostructured phases were formed in the implanted coating sub-surface layer ($100 nm depth). Concentration of nitrogen reached 90 at% in the near-surface layer after implantation, and decreased at higher depth. Nanohardness of the as-deposited coatings varied from 27 to 38 GPa depending on the deposition conditions. Ion implantation led to a significant decrease of the nanohardness to 12 GPa in the implanted region, while it reaches 24 GPa at larger depths. However, the H/E ratio is P0.1 in the sub-surface layer due to N + implantation, which is expected to have beneficial effect on the wear properties.

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Effect of V content on microstructure and mechanical properties of the CoCrFeMnNiVx high entropy alloys

Cited by 324 publications

References 46 publications

The Al Effects of Co-Free and V-Containing High-Entropy Alloys

The Al Effects of Co-Free and V-Containing High-Entropy Alloys

Evolution of Microstructure and Mechanical Properties of a CoCrFeMnNi High-Entropy Alloy during High-Pressure Torsion at Room and Cryogenic Temperatures

Nanostructured multielement (TiHfZrNbVTa)N coatings before and after implantation of N+ ions (1018cm−2): Their structure and mechanical properties

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