Effect of Nb addition on the structure and mechanical behaviors of CoCrCuFeNi high-entropy alloy coatings

Cheng, Jiangbo; Liang, Xiubing; Xu, Bopin

doi:10.1016/j.surfcoat.2013.12.053

Cited by 184 publications

(58 citation statements)

References 30 publications

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“…8. This is consistent with previous MD calculations in single crystal metals [Nishikawa and Soyama, 2011;Cheng et al, 2014]. According to the previous work [Yamakov et al, 2002;Zhang et al, 2012], a single hexagonal-close-packed (HCP) coordinated-layer represents a coherent twin boundary (TB), the two adjacent HCP-coordinatedlayers denote an intrinsic stacking fault (ISF) and the two HCP-coordinated-layers with a FCC-coordinated-layer between them indicate an extrinsic stacking fault (ESF).…”

Section: Resultssupporting

confidence: 91%

“…Recently, the hardness of 15.4 GPa in AlCoCrCuFeNi HEA films is reported [Wu et al, 2014]. The hardness-elasticity modulus ratio (H/E ratio), which has some beneficial influences on the wear resistance [Nishikawa and Soyama, 2011;Cheng et al, 2014], is 0.091 for FeCrCuAlNi HEA. Figure 3 shows the shear strain distribution of the FeCrCuAlNi HEA underneath the indenter for four different indentation depths.…”

Section: Resultsmentioning

confidence: 99%

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Atomic-scale analysis of nanoindentation behavior of high-entropy alloy

Fang

Liu

et al. 2016

J. Micromech. Mol. Phys.

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Using molecular dynamics simulations, we study the elastic and plastic deformations of indentation in FeCrCuAlNi high-entropy alloy (HEA). The indentation tests are carried out using spherical rigid indenter to investigate the effects of high-entropy and severe lattice distortion in terms of shear strain, indentation force, surface morphology, defect structure, dislocation evolution and radial distribution function on the deformation processes. It can be found that when the indentation depth increases, the shear stress requires for the occurrence of the contact area between the indenter and the substrate increased, which is attributable to a higher probability to observe the dislocation evolution under a large indentation depth. The indentation test also shows that the equal element addition can significantly improve the mechanical properties of HEA compared with the conventional alloy. Based on the Hertzian fitting, the FeCrCuAlNi HEA has the Young's modulus of 161 GPa and hardness of 15.4 GPa, respectively. These values are higher than that of traditional metal materials, due to the low stacking fault energy and the dense atomic arrangement in the slip plane of HEA. In the plastic region, the Fe element causes the more stable crystal structure, much stronger than the Cu element, presumably resulted from a variety of crystal structures for Fe in the multicomponent FeCrCuAlNi alloy. Further, this effective strategy is used to accelerate the discovery of excellent mechanical properties of HEAs.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Atomic-scale analysis of nanoindentation behavior of high-entropy alloy

Fang

Liu

et al. 2016

J. Micromech. Mol. Phys.

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“…The difficulty in deploying such methods will be in matching the technique with the length scales of interest, and factoring in the inherently slow corrosion rate of the most interesting CCAs. Methods such as online inductively coupled plasma-atomic emission spectroscopy tests (such as the AESEC technique reported by Ogle and co-workers 79 ) could help quantify the incongruent dissolution rates of the different elements constituting the CCA.…”

Section: Future Workmentioning

confidence: 99%

Corrosion of high entropy alloys

Qiu¹,

Thomas²,

Gibson³

et al. 2017

npj Mater Degrad

398

133

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High entropy alloys represent a unique class of metal alloys, comprising nominally five or more elements in near equiatomic proportions. High entropy alloys have gained significant interest on the basis that the high configurational entropy of such alloy systems is purported to result in a single-phase solid solution structure. While such a single-phase structure can occur in unique systems, it is now appreciated that the definition of high entropy alloys can be broader, with systems comprising only four elements possible of forming single phases, and most five (or more) element systems actually being multi (>2) phases. To this end, the notion of compositionally complex alloys is a more general description, with the concise review herein focusing on the corrosion of compositionally complex alloys (inclusive of high entropy alloys). It is noted that generally, in spite of complex compositions and in many cases complicated microstructural heterogeneity, compositionally complex alloys are nominally corrosion-resistant. This is discussed and aspects of the status and needs are presented.

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“…In general, the formation process of plasma-sprayed coatings is as follows: Firstly, the particles are heated to a molten or semi-molten status; then under the driving force of outside pressure airflow or heat source's own 2 airflow, the droplets are nebulized to tiny-droplets; these tiny-droplets with high velocity and temperature flight and impact on the substrate or the formed coating surface [4]. Lots of flatten droplets are solidified rapidly and deposited continually to finally form the coating with a layer structure [5].…”

Section: Introductionmentioning

confidence: 99%

Bimodal distribution characteristic of microstructure and mechanical properties of nanostructured composite ceramic coatings prepared by supersonic plasma spraying

Kang

et al. 2014

Materials & Design

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Effect of Nb addition on the structure and mechanical behaviors of CoCrCuFeNi high-entropy alloy coatings

Cited by 184 publications

References 30 publications

Atomic-scale analysis of nanoindentation behavior of high-entropy alloy

Atomic-scale analysis of nanoindentation behavior of high-entropy alloy

Corrosion of high entropy alloys

Bimodal distribution characteristic of microstructure and mechanical properties of nanostructured composite ceramic coatings prepared by supersonic plasma spraying

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