Preparation and properties of medium entropy CoCrNi/boride metal matrix composite

Moravčík, Igor; Gouvea, Larissa; Čupera, Jan; Dlouhý, Ivo

doi:10.1016/j.jallcom.2018.03.204

Cited by 55 publications

(18 citation statements)

References 46 publications

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“…[15,48e50]. The extremely reduced average grain size of the HEA, inherited from the severely plastically deformed MA powders, have caused obvious effect of grain boundary strengthening [48,51]. Moreover, the ordered B2 solid solution exhibits a lower plasticity than the fcc phase at room and elevated temperatures [31].…”

Section: Mechanical Properties Of Spsed Alcunifecr Heamentioning

confidence: 99%

Structure formation and mechanical properties of the high-entropy AlCuNiFeCr alloy prepared by mechanical alloying and spark plasma sintering

Yurkova

Cherniavsky

Bolbut

et al. 2019

Journal of Alloys and Compounds

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The phase and structural transformations in equiatomic powder compositions of the Al-Cu-Ni-Fe-Cr system during mechanical alloying (MA), annealing and subsequent spark plasma sintering (SPS) had been studied by X-ray diffraction analysis, scanning and transmission electron microscopy, and differential scanning calorimetry. It has been established that the nanocrystalline high-entropy AlCuNiFeCr alloy synthesized during MA consists of a supersaturated solid solution with a bcc crystalline structure. After annealing and spark plasma sintering at 800 C, the alloy becomes three-phased, and consists mainly of one B2-ordered solid solution, one fcc solid solution (25 wt %), and of the (Сr, Fe) 23 C 6 phase (8 wt %). The Vickers hardness of the sintered AlCuNiFeCr alloy was 8.35 GPa, and the compressive strength at room temperature reached 1960 MPa.

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Section: Mechanical Properties Of Spsed Alcunifecr Heamentioning

confidence: 99%

Structure formation and mechanical properties of the high-entropy AlCuNiFeCr alloy prepared by mechanical alloying and spark plasma sintering

Yurkova

Cherniavsky

Bolbut

et al. 2019

Journal of Alloys and Compounds

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“…The need for safety critical application materials with improved combination of high strength, low density, and high fracture resistance has been stimulating research efforts for decades [ 1 ]. Lately, high entropy alloys (HEA) consisting of several substitutional elements at near-equiatomic ratios, as well as composites derived from them have been developed [ 2 , 3 , 4 ]. These deviated from the established, single element-based alloy designs and possessed a combination of promising properties.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Interstitial Alloying of CoCrFeMnNi High Entropy Alloy through Reactive Powder Milling

Moravčík

Gouvea

Čupera

et al. 2019

Entropy

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The present work is focused on the synthesis of CoCrFeMnNi high entropy alloy (HEA) interstitially alloyed with nitrogen via powder metallurgy routes. Using a simple method, nitrogen was introduced to the HEA from the protective N2 gas atmosphere during mechanical alloying (MA) processing. The lattice parameter and amount of nitrogen in HEA were observed to be linearly proportional to the milling duration. The limited solubility of nitrogen in the main face centered cubic (FCC) phase resulted in the in-situ formation of nitrides and, accordingly, significant increase in the hardness values. It has been shown that fabrication of such nitrogen-doped HEA bulk materials can be conveniently achieved by a simple combination of MA + spark plasma sintering processes, without the need for adding nitrogen from other sources.

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“…From Nb0.45 to Nb1.0, the hardness values of these samples were significantly increased, and even reached 385-590 HV, which was 1.8-2.8 times higher than that of the substrate of 205 HV. Wherein, the hardness of Nb1.0was higher than that of the Al x CoCrCuFeNi high-entropy alloys (<550 HV) [41] and the medium-entropy CoCrNi/boride metal matrix composite (467 HV) [42]. In addition, the hardness of the Nb1.0 alloy coating was higher than that of some already used industrial wear-resistant materials, such as high-manganese steel, alloy steel (ZG35Cr2Si1MnMoRE, 5Cr5MoV, ZG22Cr8NiMoTiRE) and Cast Iron.…”

Section: Microstructuresmentioning

confidence: 94%

Microstructure and Mechanical Properties Investigation of the CoCrFeNiNbx High Entropy Alloy Coatings

Jiang

Cao

2018

Crystals

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In this work, the CoCrFeNiNb x (x: molar ratio, x = 0.45, 0.5, 0.75, and 1.0) high entropy alloy coatings were synthesized on a 304 stainless steel substrate by laser cladding to investigate the effect of Nb element on their microstructure, hardness, and wear resistance. The results indicated that in all of the CoCrFeNiNb x alloy coatings, two phases were found: One was a face-centered cubic (FCC) solid solution phase, the other was a Co 1.92 Nb 1.08 -type Laves phase. The microstructures of samples varied from hypoeutectic structure (x = 0.45 and 0.5) to hypereutectic structure (x = 0.75 and 1.0). The Vickers hardness of CoCrFeNiNb x alloy coatings was obviously improved compared with the substrate. The hardness value of the CoCrFeNiNb 1.0 alloy coating reached to 590 HV, which was 2.8 times higher than that of the substrate. There was also a corresponding variation in wear properties with hardness evolutions. Wherein the hypereutectic CoCrFeNiNb 1.0 alloy coating with the highest hardness exhibited the best wear resistance under the same wear condition, the dry wear test showed the wear mass loss of CoCrFeNiNb 1.0 alloy coating was less than a third of the substrate. The high hardness and wear resistance properties were considered with the fine lamellar eutectic structure and proper combination of FCC and Laves phases.Crystals 2018, 8, 409 2 of 11 superconductivity [24,25], soft magnetism [26,27], etc. As a result, HEAs can be an attractive material for a range of applications. However, the cost of HEAs is higher than that of conventional alloys because of the expensive high-purity raw materials. To reduce the cost, the HEA coatings obtained by laser cladding with advanced properties continue to be in great demand. At present, laser cladding as a surface coating method has been the subject of extensive research [28,29]. Advantages of laser cladding are the integrity of the fusion bond between the cladding coating and substrate, smaller thermal effects on the substrate, high process flexibility, high working speeds, and environmental protection. Moreover, the rapid solidification of laser cladding results in the finer microstructure and extended solid solution, in addition to the high-performance surface with enhanced properties. Stainless steels are widely used in industry and daily life due to their high corrosion, oxidation resistance, and workability. However, its low hardness and wear resistance are not ideal for practical applications. Therefore, the enhancement of hardness and wear resistance of the 304 stainless steels is quite necessary. Recently, there has been a growing interest in the fabrication of surface layers of HEAs on stainless steel [30][31][32]. The hardness and wear resistance of stainless steel can be improved by coating HEA on its surface. For example, FeCoCrAlNi HEA coating [33] prepared by laser cladding on 304 stainless steel possessed high hardness, which was~three times higher than that of the substrate. FeNiCoSiCrAlTi HEA coating [34] prepared by laser cladding on Q235 steel showed ...

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Preparation and properties of medium entropy CoCrNi/boride metal matrix composite

Cited by 55 publications

References 46 publications

Structure formation and mechanical properties of the high-entropy AlCuNiFeCr alloy prepared by mechanical alloying and spark plasma sintering

Structure formation and mechanical properties of the high-entropy AlCuNiFeCr alloy prepared by mechanical alloying and spark plasma sintering

Nitrogen Interstitial Alloying of CoCrFeMnNi High Entropy Alloy through Reactive Powder Milling

Microstructure and Mechanical Properties Investigation of the CoCrFeNiNbx High Entropy Alloy Coatings

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