Enhancement of fatigue resistance by overload-induced deformation twinning in a CoCrFeMnNi high-entropy alloy

Lam, Tu-Ngoc; Lee, Soo Yeol; Tsou, Nien‐Ti; Chou, H.; Lai, Bo Hong; Chang, Yu‐Jung; Feng, Rui; Kawasaki, Takuro; Harjo, Stefanus; Liaw, Peter K.; Yeh, An‐Chou; Li, Mingjun; Cai, Ren Fong; Lo, Sheng Chuan; Huang, E-Wen

doi:10.1016/j.actamat.2020.10.016

Cited by 48 publications

(9 citation statements)

References 62 publications

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“…In situ neutron-diffraction patterns were recorded at several specific strain values at which the two specimens were held. The in situ neutron-diffraction profiles were analyzed using the general structure analysis system (GSAS) [23] for single-peak fitting and Convolutional Multiple Whole Profile (CMWP) software [24,25] for determining the tensile deformation mechanisms, following the previously reported protocols [15,22,26]. We followed our earlier protocol for the procedures for in situ neutron-diffraction experiments during the tensile test and a complete data analysis process [15].…”

Section: Methodsmentioning

confidence: 99%

“…The most popular FCC HEA, the Cantor alloy CoCrFeMnNi, not only exhibits good mechanical performance but also high fatigue resistance [5,10,11,[17][18][19][20]. The as-cast microstructure of the HEAs enhances fatigue resistance [21,22]. Specifically, the as-cast dendritic structure is beneficial to tensile-overload-driven deformation twinning, and thus enhances fatigue resistance in CoCrFeMnNi HEAs [22].…”

Section: Introductionmentioning

confidence: 99%

“…The as-cast microstructure of the HEAs enhances fatigue resistance [21,22]. Specifically, the as-cast dendritic structure is beneficial to tensile-overload-driven deformation twinning, and thus enhances fatigue resistance in CoCrFeMnNi HEAs [22]. However, investigations of tensile-loading-governed microstructural defects in as-cast CoCrFeMnNi alloys are lacking.…”

Section: Introductionmentioning

confidence: 99%

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Tensile Response of As-Cast CoCrFeNi and CoCrFeMnNi High-Entropy Alloys

et al. 2022

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In this research, we systematically investigated equiatomic CoCrFeNi and CoCrFeMnNi high-entropy alloys (HEAs). Both of these HEA systems are single-phase, face-centered-cubic (FCC) structures. Specifically, we examined the tensile response in as-cast quaternary CoCrFeNi and quinary CoCrFeMnNi HEAs at room temperature. Compared to CoCrFeNi HEA, the elongation of CoCrFeMnNi HEA was 14% lower, but the yield strength and ultimate tensile strength were increased by 17% and 6%, respectively. The direct real-time evolution of structural defects during uniaxial straining was acquired via in situ neutron-diffraction measurements. The dominant microstructures underlying plastic deformation mechanisms at each deformation stage in as-cast CoCrFeNi and CoCrFeMnNi HEAs were revealed using the Convolutional Multiple Whole Profile (CMWP) software for peak-profile fitting. The possible mechanisms are reported.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tensile Response of As-Cast CoCrFeNi and CoCrFeMnNi High-Entropy Alloys

et al. 2022

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“…7 Graphical compilation of fatigue-crack-growth rate data of high-entropy alloys at the temperature of T = 298 K and stress ratio of R = 0.1. More data records are found in the database 52 – 57 . …”

Section: Technical Validationmentioning

confidence: 99%

Fatigue dataset of high-entropy alloys

et al. 2022

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Fatigue failure of metallic structures is of great concern to industrial applications. A material will not be practically useful if it is prone to fatigue failures. To take the advantage of lately emerged high-entropy alloys (HEAs) for designing novel fatigue-resistant alloys, we compiled a fatigue database of HEAs from the literature reported until the beginning of 2022. The database is subdivided into three categories, i.e., low-cycle fatigue (LCF), high-cycle fatigue (HCF), and fatigue crack growth rate (FCGR), which contain 15, 23, and 28 distinct data records, respectively. Each data record in any of three categories is characteristic of a summary, which is comprised of alloy compositions, key fatigue properties, and additional information influential to, or interrelated with, fatigue (e.g., material processing history, phase constitution, grain size, uniaxial tensile properties, and fatigue testing conditions), and an individual dataset, which makes up the original fatigue testing curve. Some representative individual datasets in each category are graphically visualized. The dataset is hosted in an open data repository, Materials Cloud.

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“…In addition, HEAs play an important role as the second phase in the manufacturing of new alloys, since they improve strength-ductility synergy [6]. These properties come from their lattice structure distortion, sluggish diffusion kinetics, the cocktail effect and the evolution of deformation twinning [3,[7][8][9][10][11][12]. One widely studied research project on CoNiCrFe HEAs reported that a single-phase CoNiCrFe possesses high tensile strength and ductility [13].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of Non-Equiatomic (CoNi)74.66Cr17Fe8C0.34 High-Entropy Alloy

et al. 2022

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In this study, we manufactured a non-equiatomic (CoNi)74.66Cr17Fe8C0.34 high-entropy alloy (HEA) consisting of a single-phase face-centered-cubic structure. We applied in situ neutron diffraction coupled with electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) to investigate its tensile properties, microstructural evolution, lattice strains and texture development, and the stacking fault energy. The non-equiatomic (CoNi)74.66Cr17Fe8C0.34 HEA revealed a good combination of strength and ductility in mechanical properties compared to the equiatomic CoNiCrFe HEA, due to both stable solid solution and precipitation-strengthened effects. The non-equiatomic stoichiometry resulted in not only a lower electronegativity mismatch, indicating a more stable state of solid solution, but also a higher stacking fault energy (SFE, ~50 mJ/m2) due to the higher amount of Ni and the lower amount of Cr. This higher SFE led to a more active motion of dislocations relative to mechanical twinning, resulting in severe lattice distortion near the grain boundaries and dislocation entanglement near the twin boundaries. The abrupt increase in the strain hardening rate (SHR) at the 1~3% strain during tensile deformation might be attributed to the unusual stress triaxiality in the {200} grain family. The current findings provide new perspectives for designing non-equiatomic HEAs.

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Enhancement of fatigue resistance by overload-induced deformation twinning in a CoCrFeMnNi high-entropy alloy

Cited by 48 publications

References 62 publications

Tensile Response of As-Cast CoCrFeNi and CoCrFeMnNi High-Entropy Alloys

Tensile Response of As-Cast CoCrFeNi and CoCrFeMnNi High-Entropy Alloys

Fatigue dataset of high-entropy alloys

Microstructural Evolution and Mechanical Properties of Non-Equiatomic (CoNi)74.66Cr17Fe8C0.34 High-Entropy Alloy

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