An investigation of the microstructural effects on the mechanical and electrochemical properties of a friction stir processed equiatomic CrMnFeCoNi high entropy alloy

Anaman, Sam Yaw; Ansah, Solomon; Cho, Hoon-Hwe; Jo, Min-Gu; Suh, Jin‐Yoo; Kang, Minjung; Lee, Jong‐Sook; Hong, Sung-Tae; Han, Heung Nam

doi:10.1016/j.jmst.2021.01.043

Cited by 26 publications

(4 citation statements)

References 64 publications

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“…In order to enhance the mechanical performance of HEAs, researchers have been focusing on various aspects such as composition design, fabrication processing and thermo-mechanical treatments, with the intention of microstructure regulation [ [10] , [11] , [12] , [13] ]. In particular, controlling the grain size (GS) has been a significant area of study as it can influence the deformation mechanisms and improve mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructure refinement and enhanced mechanical properties in rapid-quenched MnCrFeCoNi high-entropy alloy

Shao,

Guo,

Liang

et al. 2023

Heliyon

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Section: Introductionmentioning

confidence: 99%

Microstructure refinement and enhanced mechanical properties in rapid-quenched MnCrFeCoNi high-entropy alloy

Shao,

Guo,

Liang

et al. 2023

Heliyon

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“…The main heat to plasticize the material is supplied by the frictional contact between the tool shoulder and the workpiece [ 15 , 16 ]. Therefore, a decrease in the deformation temperature and strain rate generally occurred from the top to the bottom of the stir zone [ 17 , 18 ]. This gradient of the deformation temperature and strain rate resulted in differences in grain size, dislocation density, recrystallization, and precipitation in different regions of the stir zone [ 19 , 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Restirring and Reheating Effects on Microstructural Evolution of Al–Zn–Mg–Cu Alloy during Underwater Friction Stir Additive Manufacturing

Wei

et al. 2022

Materials

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Friction stir additive manufacturing (FSAM) can be potentially used for fabricating high-performance components owing to its advantages of solid-state processing. However, the inhomogeneous microstructures and mechanical properties of the build attributed to the complex process involving restirring and reheating deserve attention. This study is based on the previous research of the underwater FSAMed 7A04 aluminum alloy and adopts a quasi in situ experimental method, i.e., after each pass of the underwater FSAM, samples were taken from the build for microstructural observation to investigate the restirring and reheating effects on microstructural evolution during the underwater FSAM. Fine-grain microstructures were formed in the stir zone during the single-pass underwater FSAM. After restirring, the grain size at the bottom of the overlapping region decreased from 1.97 to 0.87 μm, the recrystallization degree reduced from 74.0% to 29.8%, and the initial random texture transformed into a strong shear texture composed of the C {110}<11¯0>. After reheating, static recrystallization occurred in the regions close to the new additive zones, increasing the grain size and recrystallization degree. This study not only revealed the microstructural evolution during the underwater FSAM but also provided a guideline for further optimization of the mechanical properties of the Al–Zn–Mg–Cu alloy build.

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“…Традиционный подход к созданию новых конструкционных материалов заключается в выборе одного основного элемента в качестве матрицы, которая легируется для получения желаемой комбинации механических и/или технологических свойств. В последние годы был предложен новый подход к созданию многокомпонентных сплавов, содержащих несколько элементов с концентрацией, близкой к эквиатомной [1][2][3]. Для таких сплавов характерны повышенные по сравнению с традиционными сплавами значения энтропии смешения, в связи с чем они получили название высокоэнтропийных сплавов (ВЭС).…”

Section: Introductionunclassified

Thermal stability and corrosion resistance of ultrafine-grained high-entropy Fe30Ni30Mn30Cr10 alloy

Nesterov¹,

Фаррахов²,

Aubakirova³

et al. 2022

FMT

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One of the promising research areas developing in recent times in the materials science is the development and research of high-entropy alloys containing several metal elements with the concentration close to equiatomic. The interest to them is generated by the fact that such alloys demonstrate the improved mechanical and functional properties. Another promising area improving strength of metallic materials is grain refinement using the severe plastic deformation methods. This work uses both approaches to form an ultrafine-grained (UFG) structure in the high-entropy Fe30Ni30Mn30Cr10 alloy. The paper presents the structure, strength, thermal stability, and corrosion resistance of a high-entropy alloy subjected to the high pressure torsion (HPT). The study of the structure carried out by scanning electron microscopy showed that the application of the HPT deformation leads to the formation of an UFG structure with an average grain diameter less than 200 nm depending on temperature of HPT processing. Microhardness measuring and tensile tests at room temperature showed that after grain refinement, an increase in microhardness and ultimate tensile strength occurs in a high-entropy alloy, which is more than three times higher compared to the initial coarse-grained sample. At the same time, the UFG samples of a high-entropy alloy manifested thermal stability of microhardness after annealing up to temperature of 500 °С. The electrochemical tests carried out in an aqueous solution of 3.5 % NaCl at the temperature of 37 °С demonstrated a high corrosion resistance of the UFG high-entropy alloy.

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An investigation of the microstructural effects on the mechanical and electrochemical properties of a friction stir processed equiatomic CrMnFeCoNi high entropy alloy

Cited by 26 publications

References 64 publications

Microstructure refinement and enhanced mechanical properties in rapid-quenched MnCrFeCoNi high-entropy alloy

Microstructure refinement and enhanced mechanical properties in rapid-quenched MnCrFeCoNi high-entropy alloy

Restirring and Reheating Effects on Microstructural Evolution of Al–Zn–Mg–Cu Alloy during Underwater Friction Stir Additive Manufacturing

Thermal stability and corrosion resistance of ultrafine-grained high-entropy Fe30Ni30Mn30Cr10 alloy

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