The phase stability of equiatomic CoCrFeMnNi high-entropy alloy: Comparison between experiment and calculation results

Park, Nokeun; Lee, Byeong-Joo; Tsuji, Nobuhiro

doi:10.1016/j.jallcom.2017.05.175

Cited by 86 publications

(26 citation statements)

References 21 publications

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“…X-ray diffraction analysis shows that the as-atomized powder maintains a single face-centered cubic phase with a lattice parameter of 3.596 Å, which agrees well with previously reported values [36,37], Figure 1. The diffraction peaks at 43.32°, 50.45°, and 74.12°are corresponded to the (111), (200), and (220) planes of a face-centered cubic crystalline structure, respectively.…”

Section: Crystal Structure Of the Cocrfemnni Powdersupporting

confidence: 91%

CoCrFeMnNi high‐entropy alloy powder with excellent corrosion resistance and soft magnetic property prepared by gas atomization method

Jin¹,

Gu²,

Feng

et al. 2019

Materialwissenschaft Werkst

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To successfully fabricate high‐entropy alloys by powder metallurgy, laser cladding, or thermal sprayed method, the high‐entropy alloy powders possessing good homogeneous microstructure are very important. However, the study on the properties of the high‐entropy alloy powder has still been lacking. In this work, an equiatomic CoCrFeMnNi high‐entropy alloy powder with spherical shape was synthesized by gas atomization method. The as‐atomized CoCrFeMnNi high‐entropy alloy powder is composed of a single face‐centered cubic solid solution phase with the particle size of 34.0 μm. Furthermore, the as‐atomized powder exhibits excellent corrosion resistance in 10 % hydrochloric acid solution to 304 L stainless steel powder, and also shows an excellent soft magnetic behavior. Therefore, the gas atomization method can be used to generate other kinds of high‐entropy alloy powders for many challenging industrial applications.

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Section: Crystal Structure Of the Cocrfemnni Powdersupporting

confidence: 91%

CoCrFeMnNi high‐entropy alloy powder with excellent corrosion resistance and soft magnetic property prepared by gas atomization method

Jin¹,

Gu²,

Feng

et al. 2019

Materialwissenschaft Werkst

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“…38 The software Thermo-Calc 39 and the thermodynamic database TCFE2000 and its upgraded version 40,41 have been used for thermodynamic calculations on HEAs. 42,43 Recently, this thermodynamic database was further upgraded in a way that improved the description for the sigma phase and was used in the present work. Details of the upgrade of the thermodynamic database will be reported separately, later on (Choi, W.-M. and Lee, B.-J., 2017, POSTECH, unpublished work).…”

Section: Resultsmentioning

confidence: 99%

Understanding the physical metallurgy of the CoCrFeMnNi high-entropy alloy: an atomistic simulation study

et al. 2018

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Although high-entropy alloys (HEAs) are attracting interest, the physical metallurgical mechanisms related to their properties have mostly not been clarified, and this limits wider industrial applications, in addition to the high alloy costs. We clarify the physical metallurgical reasons for the materials phenomena (sluggish diffusion and micro-twining at cryogenic temperatures) and investigate the effect of individual elements on solid solution hardening for the equiatomic CoCrFeMnNi HEA based on atomistic simulations (Monte Carlo, molecular dynamics and molecular statics). A significant number of stable vacant lattice sites with high migration energy barriers exists and is thought to cause the sluggish diffusion. We predict that the hexagonal close-packed (hcp) structure is more stable than the face-centered cubic (fcc) structure at 0 K, which we propose as the fundamental reason for the micro-twinning at cryogenic temperatures. The alloying effect on the critical resolved shear stress (CRSS) is well predicted by the atomistic simulation, used for a design of non-equiatomic fcc HEAs with improved strength, and is experimentally verified. This study demonstrates the applicability of the proposed atomistic approach combined with a thermodynamic calculation technique to a computational design of advanced HEAs.

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“…Amongst the constituent elements of the HEAs, Cu having the lowest melting point is most oxidation prone. On the other side, σ is an oxidation-resistant phase as it mainly contains Co, Cr, Fe and Ni, along with added Si [21,[45][46][47][48]. The amount of sigma phase increases with Si addition resulting in more oxidation resistance alloy.…”

Section: Oxidation Kinetics Of Heasmentioning

confidence: 99%

Oxidation study of CoCrCuFeNiSix high entropy alloys

Shajahan

Kumar

Chopkar

et al. 2020

Mater. Res. Express

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Oxidation studies of Co-Cr-Cu-Fe-Ni-Si X=(0,0.3,0.6,0.9) high entropy alloys (HEA) at 600, 700 and 800°C for 30 h are performed in the present work. Isothermal oxidation confirmed that the oxidation resistance of Co-Cr-Cu-Fe-Ni-Si X=(0,0.3,0.6,0.9 ) high entropy alloy increases with Silicon (Si) content up to 0.6%, beyond that it decreases. Oxidation rate kinetics study of all the alloys at the three designated test temperature represented the typical cubic curve. X-ray diffraction (XRD) analysis revealed the evolution of Cu oxide (CuO) along with existing phases in all the HEA samples. Microstructural observation after oxidation test exhibited an increase in oxide formation with the oxidation temperature. To comprehend the kinetics of oxidation more clearly, Arrhenius plots were drawn for all the HEA samples and activation energies are calculated.

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The phase stability of equiatomic CoCrFeMnNi high-entropy alloy: Comparison between experiment and calculation results

Cited by 86 publications

References 21 publications

CoCrFeMnNi high‐entropy alloy powder with excellent corrosion resistance and soft magnetic property prepared by gas atomization method

CoCrFeMnNi high‐entropy alloy powder with excellent corrosion resistance and soft magnetic property prepared by gas atomization method

Understanding the physical metallurgy of the CoCrFeMnNi high-entropy alloy: an atomistic simulation study

Oxidation study of CoCrCuFeNiSix high entropy alloys

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