A brief review of metastable high-entropy alloys with transformation-induced plasticity

Yu, Haoyang; Zhang, Jinfei; Fang, Wei; Chang, Ruobin; Bai, Xi; Yan, Jiaohui; Zhang, Xin; Liu, Baoxi; Yin, Fuxing

doi:10.1080/02670836.2020.1851437

Cited by 20 publications

(3 citation statements)

References 106 publications

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“…Industrial progress is often linked with the development of novel materials with desired properties [1,2]. Since ancient times, metallic alloys have been used for structural applications wherein property enhancement is achieved by adding alloying elements in minor amounts to a principal element (Fe in steel, Ni in superalloy and Al in aluminium alloy).…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution in CoCrFeNi and CoCrCuFeNi alloys processed by autogenous fusion welding

Verma

Shanmugasundaram

2022

Materials Science and Technology

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In this work, CoCrFeNi and CoCrCuFeNi multi-principal element alloys were welded using an autogenous gas tungsten arc welding process. Tensile testing, microhardness, X-ray diffraction, scanning electron microscopy, electron back scattered diffraction techniques were used to study the mechanical properties, crystal structure and microstructures of the base metals (BMs) and welds. It was found that CoCrFeNi alloy was easily weldable while CoCrCuFeNi alloy produced transverse cracks. Only 13.5% decrease in ultimate tensile strength as compared to its BM was observed in CoCrFeNi alloy. Whereas poor tensile properties were observed in CoCrCuFeNi alloy due to Cu segregation and micro-cracks. Fractography analysis of the BM and weld specimen shows ductile failure in both the alloys.

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Section: Introductionmentioning

confidence: 99%

Microstructural evolution in CoCrFeNi and CoCrCuFeNi alloys processed by autogenous fusion welding

Verma

Shanmugasundaram

2022

Materials Science and Technology

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“…Among these HEA systems, quinary CoCrFeMnNi and its variants with FCC structures are the most intensively investigated owing to excellent tensile properties and superior cryogenic fracture resistance [17][18][19]. The stacking fault energy (SFE) is a main factor affecting the plastic deformation mechanism of metals in FCC structures [3,[20][21][22]. Recently, transformationinduced plasticity (TRIP) effect was introduced into HEAs by altering the compositions to tailor the SFE, motivated by the low SFE metals such as TRIP steels and metastable austenitic steel [23,24].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of Co35Cr25Fe30Ni10 TRIP Complex Concentrated Alloy with the Addition of Minor Cu and Its Effect on Mechanical Properties

Fang

Zhang

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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The influences of minor Cu addition (2 and 4 at.%) on the microstructural evolution and room-temperature mechanical property of metastable Co 35 Cr 25 Fe 30 Ni 10 are systemically investigated in the present study. The results indicate that the thermally induced hexagonal close-packed (HCP) phase is absent when Cu was added, due to the increase in stacking fault energy (SFE). The 2%-Cu-added alloys showed the largest total elongation of 69% among the three alloys. With the addition of Cu content reaching 4 at.%, heterogeneous grain structures composed of coarse grains (~ 9 μm) and fine grains (~ 4 μm) and Cu-rich precipitates near the grain boundary are observed, showing the highest yield strength. Additionally, the segregation state of Cu was quantitatively characterized by electron probe microanalysis (EPMA). And effects of Cu addition on microstructures and tensile properties of (Co 35 Cr 25 Fe 30 Ni 10 ) 100-x Cu x are also discussed. The findings are beneficial to comprehensively understand the Cu-containing complex concentrated alloys.

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“…We demonstrate that accounting for the Baskin-Magarill-Entin (BME) mechanism of the memory effect [23] leads to the significant enhancement of the AMR in the classically strong range of magnetic fields in bulk metals with EOD even despite that the underlying electron spectrum had isotropic character. Note that the term memory effect can also refer to phenomena associated, for example, with the plasticity of materials and with their shape memory [24,25]. In our work we focus only on the effects arising from the persisting correlations of the electron trajectories between different scattering events and do not consider other 'memory effects'.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic magnetoresistance and memory effect in bulk systems with extended defects

Denisov¹,

Baryshnikov²,

Alekseev³

et al. 2021

J. Phys.: Condens. Matter

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To describe kinetic phenomena in disordered conductors, various acts of scattering of electrons can be often considered as independent, that is captured by the Boltzmann equation. However, in some regimes, especially, in a magnetic field, it becomes necessary to take into account the correlations between different scattering events of electrons on defects at different times in the past. Such memory effects can have a profound impact on the resistivity of 2D semiconductor systems, resulting in giant negative magnetoresistance and microwave-induced resistance oscillations phenomena. This work opens the discussion of the memory effects in 3D conducting systems featured by the presence of extended one-dimensional defects, such as screw dislocations or static charge stripes. We demonstrate that accounting for the memory effect, that is the capture of electrons on collisionless spiral trajectories winding around extended defects, leads to the strong negative magnetoresistance in case when the external magnetic field direction becomes parallel to the defects axis. This effect gives rise to a significant magnetoresistance anisotropy already for an isotropic Fermi surface and no spin-orbit effects. The proposed resistivity feature can be used to detect one-dimensional scattering defects in these systems.

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A brief review of metastable high-entropy alloys with transformation-induced plasticity

Cited by 20 publications

References 106 publications

Microstructural evolution in CoCrFeNi and CoCrCuFeNi alloys processed by autogenous fusion welding

Microstructural evolution in CoCrFeNi and CoCrCuFeNi alloys processed by autogenous fusion welding

Microstructural Evolution of Co35Cr25Fe30Ni10 TRIP Complex Concentrated Alloy with the Addition of Minor Cu and Its Effect on Mechanical Properties

Anisotropic magnetoresistance and memory effect in bulk systems with extended defects

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