The influence of incorporation of Mn on the pitting corrosion performance of CrFeCoNi High Entropy Alloy at different temperatures

Torbati-Sarraf, Hamidreza; Shabani, Mitra; Jablonski, Paul D.; Pataky, Garrett J.; Poursaee, Amir

doi:10.1016/j.matdes.2019.108170

Cited by 98 publications

(34 citation statements)

References 96 publications

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“…Unlike conventional metallic alloys, which are comprised of a base (solvent) and alloying (solute) elements, high entropy alloys (HEAs) are a class of structural alloys first introduced by Cantor et al 1 and Yeh et al 2 that consist of multiple principal elements in equiatomic or near equiatomic concentrations 3 – 5 . Owing to their multi-principal element compositions, HEAs are characterized by unique combinations of properties, including mechanical strength 2 , 6 , 7 , hardness 8 , 9 , and wear 10 , 11 and corrosion resistance 12 – 15 . The use of multiple principal elements in far-from dilute concentrations unlocks infinite possibilities of combinations of properties and functionalities that are not typically found in conventional metallic alloys.…”

Section: Introductionmentioning

confidence: 99%

Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals

Lee

Shabani

Pataky

et al. 2021

Sci Rep

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High entropy alloys (HEA) are a class of materials that consist of multiple elemental species in similar concentrations. The use of elements in far from dilute concentrations introduces a multi-dimensional composition design space by which the properties of metallic systems can be tailored. While the mechanical behavior of HEAs has been the subject of active research recently, the role of grain boundaries (GBs) in their deformation behavior remains poorly understood. Motivated by recent experiments on HEAs demonstrating that GBs act as nucleation sites for deformation twins, herein, we leverage atomistic simulations to construct a series of equiatomic CoCrFeMnNi HEA bicrystals with $$\langle 110 \rangle$$ ⟨ 110 ⟩ and $$\langle 111 \rangle$$ ⟨ 111 ⟩ symmetric twist GBs and examine their tensile behavior and underlying deformation mechanisms at 77 K. Simulation results reveal that plastic deformation proceeds by the nucleation of partial dislocations from GBs, which then grow with further loading by bowing into the bulk crystals leaving behind stacking faults. Variations in the nucleation stress exist as function of GB character, defined in this work by the twist angle. Our results provide future avenues to explore GBs as a microstructure design tool to develop HEAs with tailored properties.

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Section: Introductionmentioning

confidence: 99%

Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals

Lee

Shabani

Pataky

et al. 2021

Sci Rep

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“…A higher value of impedance modulus (

(||, Z)

) in the low‐frequency domain essentially indicates a higher polarization resistance. [ 30,32 ] As revealed from the Bode impedance plots (see Figure 3c), the lowest value of

(||, Z)

corresponds to the AR specimen, and the

(||, Z)

value gradually increases with the increasing extent of spheroidization. This is in good agreement with the observations made from the Nyquist plots (see Figure 3c).…”

Section: Resultsmentioning

confidence: 97%

“…The effective capacitance being independent of other circuital components is considered as an important parameter to appraise the resistance against corrosion. [ 20,32 ] Therefore, the effective capacitance values ( C dl and C f ) corresponding to each loop are also calculated using available equations in literature to further validate the experimental observations. The effective double‐layer capacitance ( C dl ) is calculated using the Brug formula, [ 36 ] as shown below:

Z_{Q} = {[Y {j ω)}^{n}]}^{- 1},

C_{dl} = {Y_{1}}^{\frac{1}{n_{1}}} {true(\frac{1}{R_{normals}} + \frac{1}{R_{ct}} true)}^{\frac{n_{1} - 1}{n_{1}}} .

…”

Section: Resultsmentioning

confidence: 99%

Effect of spheroidized microstructure on the impact toughness and electrochemical performance of a high‐carbon steel

Bairagi

Munukuti

Bhuyan

et al. 2020

Materials & Corrosion

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The influence of cementite spheroidization on the impact toughness and electrochemical properties of a high‐carbon steel has been thoroughly investigated in this study. Heavy warm rolling, followed by 2 h of annealing, has resulted in near‐complete spheroidization, leading to a microstructure consisting of nano‐cementite globules dispersed in the ultrafine‐grained ferritic matrix. The Charpy impact test exhibited superior impact toughness with increased spheroidization. It is validated by the presence of abundant dimples in the fractographs of spheroidized specimens, in contrast to the as‐received one that experienced a brittle failure due to its lamellar pearlitic structure. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) carried out in a 3.5% NaCl solution revealed that the corrosion resistance of the alloy gets improved with the increase in the degree of spheroidization. This is attributed to the lower susceptibility of the spheroidized specimen to microgalvanic corrosion owing to the minimum area of contact between nano‐spheroidized cementite and ferrite, as elucidated with the help of EIS results aided by equivalent electrical circuit model.

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“…Further research trials showed that the substitution of Co with Mn in the AlCoCrFeNi system generates a novel structure composed of a solid solution matrix and evenly dispersed nanometric size intermetallic compounds [ 59 ]. Mn added to CrFeCoNi improves the pitting corrosion [ 60 ] and additions of Mn to Cu containing HEAs has a beneficial influence in decreasing the element segregation, thus suppressing the galvanic corrosion [ 61 ].…”

Section: Critical Raw Materials Substitution Challenges and Cca Potmentioning

confidence: 99%

Complex Concentrated Alloys for Substitution of Critical Raw Materials in Applications for Extreme Conditions

Mitrică¹,

Badea²,

Serban³

et al. 2021

Materials

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The paper is proposing a mini-review on the capability of the new complex concentrated alloys (CCAs) to substitute or reduce the use of critical raw materials in applications for extreme conditions. Aspects regarding the regulations and expectations formulated by the European Union in the most recent reports on the critical raw materials were presented concisely. A general evaluation was performed on the CCAs concept and the research directions. The advantages of using critical metals for particular applications were presented to acknowledge the difficulty in the substitution of such elements with other materials. In order to establish the level of involvement of CCAs in the reduction of critical metal in extreme environment applications, a presentation was made of the previous achievements in the field and the potential for the reduction of critical metal content through the use of multi-component compositions.

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The influence of incorporation of Mn on the pitting corrosion performance of CrFeCoNi High Entropy Alloy at different temperatures

Cited by 98 publications

References 96 publications

Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals

Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals

Effect of spheroidized microstructure on the impact toughness and electrochemical performance of a high‐carbon steel

Complex Concentrated Alloys for Substitution of Critical Raw Materials in Applications for Extreme Conditions

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