Enhanced lattice distortion, yield strength, critical resolved shear stress, and improving mechanical properties of transition-metals doped CrCoNi medium entropy alloy

Ali, Md. Lokman

doi:10.1039/d1ra02073k

Cited by 12 publications

(5 citation statements)

References 30 publications

(40 reference statements)

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“…1), the addition of Y causes a shift in the positions of the FCC reflections towards the lower angles due to the dissolution of Y in the matrix. This suggests a lattice distortion in the FCC crystal structure, and hence, an inc-rease in the mechanical properties (44) due to the much larger atomic radius of Y as compared to the elements in the matrix (45). Secondly, the formation of the second phase causes a dramatic increase in the mechanical properties of the HEAs as reported in the previous studies (14,32,42).…”

Section: The Evolution Of Mechanical Propertiesmentioning

confidence: 58%

Microstructural Evolution and Mechanical Properties of Y Added CoCrFeNi High-entropy Alloys Produced by Arc-melting

Polat,

Kotan

2024

Hittite Journal of Science and Engineering

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The CoCrFeNi high entropy alloy (HEA) with face-centered cubic (FCC) crystal structure exhibits excellent ductility values even at cryogenic temperatures. However, since this HEA is relatively weak in strength, it may not meet the requirements of industrial applications in terms of strength-ductility trade-off. Therefore, the systematic addition of yttrium (Y) into CoCrFeNi HEA was investigated in the present study to increase the strength by solid solution and second phase strengthening. The HEAs were produced by vacuum arc melting, suction casting, and subsequent homogenization at 1150 °C for 24 h. The structural development of the HEAs was investigated by using the X-ray diffraction (XRD) technique revealing the formation of a solid solution phase and Ni3Y-type hexagonal structure (HS) second phase. The corresponding microstructure of the HEAs was examined under a scanning electron microscope (SEM) revealing the transformation of the microstructure from elongated grains to nearly equiaxed grains with the increase of Y content from 2 at. % to 4 at. %. The mechanical properties of the HEAs were investigated by using hardness and compression tests. The results exhibited a dramatic increase in the hardness from 143 (±2) HV to 335 (±7) HV and in the yield strength from 130 MPa to 1025 MPa with 4 at. % Y addition. Our study has revealed that the addition of rare earth Y element results in further development in the strength of the CoCrFeNi for potential engineering applications.

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Section: The Evolution Of Mechanical Propertiesmentioning

confidence: 58%

Microstructural Evolution and Mechanical Properties of Y Added CoCrFeNi High-entropy Alloys Produced by Arc-melting

Polat,

Kotan

2024

Hittite Journal of Science and Engineering

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“…The lattice distortion is a basic prominence of a crystal. Doping element can induce either lattice expansion or contraction, according to its relative atomic size, crystal structure and chemical bond with respect to undoped element [39,40]. In Ba 2 TbBi (1−x) Sb x O 6 (x = 0, 0.5) perovskites lattice distortion occurs due to the departure or outgoing of atoms location from the pure lattice due to 50% Sb doping in place of Bi.…”

Section: Lattice Distortionmentioning

confidence: 99%

“…Lattice distortion enhances the internal energy and the microscopic stress of the material. It resists the dislocation glide deformation, making the material strength and hardness increase [40].…”

Section: Lattice Distortionmentioning

confidence: 99%

Enhanced stability and optoelectronic properties of Potential Lead-free Double Perovskite Oxides Ba2TbBiO6 by Sb doping for solar cells

Ali,

Hasan,

Khan

et al. 2023

Preprint

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The influence of Sb-doping in the Bi-based double perovskite \({\text{B}\text{a}}_{2}{\text{T}\text{b}\text{B}\text{i}}_{1-\text{x}}{\text{S}\text{b}}_{\text{x}}{\text{O}}_{6}(\text{x}=0.0, 0.5)\) to provide a structural and electronic basis for comprehending various physical properties in an atomistic level. Using first-principles calculations based on density functional theory (DFT) implemented via the VASP code. For the first time we study the comprehensive analysis of the structural, elastic, mechanical, electronic, and thermodynamic properties of undoped and Sb-doped \({\text{B}\text{a}}_{2}\text{T}\text{b}\text{B}\text{i}{\text{O}}_{6}\) double perovskite (cubic and monoclinic phases). Changing the spatial group structure and lattice constant of \({\text{B}\text{a}}_{2}\text{T}\text{b}\text{B}\text{i}{\text{O}}_{6}\) by doping causes a shift in the Brillouin zone, which in turn modifies the band structure and band gap value. The overall DOS profiles of both doped and undoped phases were identical to those of the undoped sample, however the conduction and valance bands for both doped compositions were slightly pushed nearer the fermi level. The elastic constants verified the ductility of the solids and ensured the mechanical stability of both phases. Before and after doping, the monoclinic phase is ductile while the cubic phase is brittle. This study reveals that both the phases of \({\text{B}\text{a}}_{2}{\text{T}\text{b}\text{B}\text{i}}_{1-\text{x}}{\text{S}\text{b}}_{\text{x}}{\text{O}}_{6}\) are mechanically stable, ductile, and machinable than\({\text{B}\text{a}}_{2}\text{T}\text{b}\text{B}\text{i}{\text{O}}_{6}\). Although both phases were anisotropic, the Sb-doped monoclinic phase showed higher anisotropy than the cubic phase. Vickers hardness shows that monoclinic \({\text{B}\text{a}}_{2}{\text{T}\text{b}\text{B}\text{i}}_{1-\text{x}}{\text{S}\text{b}}_{\text{x}}{\text{O}}_{6}(\text{x}=0.0, 0.5)\) phase is harder than cubic \({\text{B}\text{a}}_{2}{\text{T}\text{b}\text{B}\text{i}}_{1-\text{x}}{\text{S}\text{b}}_{\text{x}}{\text{O}}_{6}(\text{x}=0.0, 0.5)\) phases. Moreover, the thermodynamic properties of all the studied compounds are estimated by using the elastic constant data. The cubic and monoclinic phases of\({\text{B}\text{a}}_{2}{\text{T}\text{b}\text{B}\text{i}}_{0.5}{\text{S}\text{b}}_{0.5}{\text{O}}_{6}\)have Debye temperatures of 248.48 and 240.75 K, respectively. After doping, the melting temperature of cubic phase (1529.21 K) rises greater than that of monoclinic phase (1386.87 K). Doping can improve a material’s stability by reducing its thermal expansion coefficient. Both the doped phases can be employed as a thermal barrier coating (TBC). The doped cubic phase in high-efficiency conversion applications like solar cells and other optoelectronic devices.

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“…Since 2018, the number of reports on the CoCrNi alloy has increased dramatically. The understanding of various aspects of the alloy has been gradually deepened, including lattice distortion (LD) [34][35][36] , stacking fault energy (SFE) [37][38][39][40] and the critical shear stress of dislocations and twins [41] . The dislocation, twinning, phase transformation and even texture during deformation have been systematically studied [42][43][44][45][46][47] .…”

Section: Development Of Cocrni Alloymentioning

confidence: 99%

“…Jian et al [34] investigated the role of LD and SRO in the nucleation and evolution of dislocations and nanotwins in single-crystal and nanocrystalline CoCrNi alloys. They showed that YSs were determined by the strain to nucleate the Shockley partial dislocations.…”

Section: Lattice Distortionmentioning

confidence: 99%

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Xu¹,

Wang²,

Li³

et al. 2022

Microstructures

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The CoCrFeMnNi alloy is one of the most notable first-generation high-entropy alloys and is also known as a Cantor alloy. This alloy was first proposed in 2004 and shows promising performance at cryogenic temperatures (CTs). Subsequent research has indicated that the equiatomic ternary CoCrNi medium-entropy alloy (MEA), as a subset of the Cantor alloy family, has better mechanical properties than the CoCrFeMnNi alloy. Interestingly, both the strength and ductility of the CoCrNi MEA are higher at CTs than at room temperature. CoCrNi-based alloys have attracted considerable attention in the metallic materials community and it is therefore important to generalize and summarize the latest progress in CoCrNi-based MEA research. The present review initially briefly introduces the discovery of the CoCrNi MEA. Subsequently, its tensile response and deformation mechanisms are summarized. In particular, the effects of parameters, such as critical resolved shear stress, stacking fault energy and short-range ordering, on the deformation behavior are discussed in detail. The methods for strengthening the CoCrNi MEA are then reviewed and divided into two categories, namely, modifying microstructures and adjusting chemical compositions. In addition, the mechanical performance of CoCrNi-based MEAs, including their dynamic shear properties, creep behavior and fracture toughness, is also deliberated. Finally, the development prospects of CoCrNi-based MEAs are proposed.

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Enhanced lattice distortion, yield strength, critical resolved shear stress, and improving mechanical properties of transition-metals doped CrCoNi medium entropy alloy

Abstract: The effect of transition-metals (TM) addition on the mechanical properties of CrCoNi medium entropy alloys (MEAs) was investigated.

Cited by 12 publications

References 30 publications

Microstructural Evolution and Mechanical Properties of Y Added CoCrFeNi High-entropy Alloys Produced by Arc-melting

Microstructural Evolution and Mechanical Properties of Y Added CoCrFeNi High-entropy Alloys Produced by Arc-melting

Enhanced stability and optoelectronic properties of Potential Lead-free Double Perovskite Oxides Ba2TbBiO6 by Sb doping for solar cells

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

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