Transition of plastic deformation mechanisms governed by spacing of nano-precipitates in a high entropy alloy

Liu, Liyuan; Zhang, Yang; Ma, Jingming; Shang, Yongxuan; Han, Jihong; Li, Junpeng; Zhang, Zhongwu

doi:10.1016/j.scriptamat.2022.114771

Cited by 38 publications

(4 citation statements)

References 29 publications

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“…4 F 3 ) further verify the existence of intersected SFs. These SF networks and LC locks can not only refine the microstructure but also evolve into Frank-Read sources that motivate dislocation multiplication, achieving a progressive and stead work hardening in the UFG tribo-layer of the NiX [ 54 , 55 ]. As the depth increases to the bottom of the UFG tribo-layer (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…According to classical Orowan relation [ 59 ], as the SFE decreases, the partial dislocation activity becomes more favored, while the full dislocation activity is substantially suppressed. The small regions with reduced SFE may form around the A2 nanoprecipitates due to the depletion of high-SFE elements (Ni and Al) [ 55 ]. Second, the dislocations cut through the hetero-interface between A1 and A3 phases (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

et al. 2023

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Sustained wear damages on the sliding surfaces of alloys are generally the culprit responsible for the failure of various mechanical systems. Inspired by high-entropy effects, here we deliberately deploy nanohierarchical architecture with composition undulation in a Ni 50 (AlNbTiV) 50 complex concentrated alloy, which yields ultralow wear rate within the order of 10 −7 to 10 −6 mm 3 /Nm between room temperature and 800 °C. Such remarkable wear resistance heretofore represents one of the highest wear resistance reported for the bulk alloys or composites, and originates from the multi-type adaptive friction interface protection governed by intrinsically nano-coupled grains and nanoprecipitates. This cooperative heterostructure releases gradient frictional stress in stages upon wear at room temperature through the coexistence of multiple deformation pathways while activating a dense nanocrystalline glaze layer upon wear at 800 °C to minimize adhesive and oxidative wear. Our work uncovers a practical avenue for tailoring wear properties with multicomponent heterostructures over a wide temperature range.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

et al. 2023

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“…The yield strength of the UFG structure was doubled with nearly no change in the uniform ductility relative to the steel without Cu addition. In a Ni 35 (CoFe) 55 V 5 Nb 5 HEA, the precipitation of copious L1 2 -(Ni 24 Co 18 Fe 6 ) 3 (Nb 10 V 4 Fe 2 ) nanoprecipitates resulted in significant strengthening on the one hand and lowered the SFE of the coarse-grained matrix on the other hand, contributing to an excellent work-hardening ability and large plasticity through activating the continuous formation of SF networks and Lomer–Cottrell locks during deformation (Figure c). , The above bifunctional strategies are expected to be readily applied to other alloy systems.…”

Section: Nanoprecipitationmentioning

confidence: 99%

Phase Engineering of Nanostructural Metallic Materials: Classification, Structures, and Applications

Gu,

Duan,

Liu

et al. 2024

Chem. Rev.

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Metallic materials are usually composed of single phase or multiple phases, which refers to homogeneous regions with distinct types of the atom arrangement. The recent studies on nanostructured metallic materials provide a variety of promising approaches to engineer the phases at the nanoscale. Tailoring phase size, phase distribution, and introducing new structures via phase transformation contribute to the precise modification in deformation behaviors and electronic structures of nanostructural metallic materials. Therefore, phase engineering of nanostructured metallic materials is expected to pave an innovative way to develop materials with advanced mechanical and functional properties. In this review, we present a comprehensive overview of the engineering of heterogeneous nanophases and the fundamental understanding of nanophase formation for nanostructured metallic materials, including supra-nano-dual-phase materials, nanoprecipitation-and nanotwin-strengthened materials. We first review the thermodynamics and kinetics principles for the formation of the supra-nano-dual-phase structure, followed by a discussion on the deformation mechanism for structural metallic materials as well as the optimization in the electronic structure for electrocatalysis. Then, we demonstrate the origin, classification, and mechanical and functional properties of the metallic materials with the structural characteristics of dense nanoprecipitations or nanotwins. Finally, we summarize some potential research challenges in this field and provide a short perspective on the scientific implications of phase engineering for the design of next-generation advanced metallic materials.

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“…Especially, at cryogenic temperatures, the Cantor alloy exhibits an ultrahigh tensile strength above 1 GPa and a fracture toughness exceeding 200 MPa m 1/2 due to microtwinning [16]. Moreover, previous studies have proposed that multiple deformation behaviors, including dislocation gliding, deformation twinning and phase transformation, have been observed in some HEAs due to their much lower stacking fault energy (SFE) [16,18]. Alloying usually brings lower or even negative SFEs for HEAs [19][20][21][22][23][24][25][26], e.g.…”

Section: Introductionmentioning

confidence: 99%

Effect of loading orientation on plasticity in nano-laminated CoNiCrFeMn dual-phase high-entropy alloy: a molecular dynamics study

Shuang¹,

Liang²,

Yu³

et al. 2022

Modelling Simul. Mater. Sci. Eng.

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Dual-phase high-entropy alloys (DP-HEAs) have been proved to be a kind of promising materials that exhibit a combination of excellent strength and ductility. Previous studies have emphasized the effect of interface and phase volume fraction on mechanical performance in DP-HEAs. However, the deformation mechanisms such as interplays between dislocations and the constituent phases have not been fully understood. Particularly, the research concerning plastic anisotropy in DP-HEAs is still lacking. Here, molecular dynamics simulations are performed to probe the effect of loading orientation on plasticity in the nano-laminated face-centered cubic (FCC)/hexagonal close-packed (HCP) CoNiCrFeMn DP-HEA. Results reveal that a switch from strengthening to softening and back to strengthening is closely related to the activation of different slip systems when tailoring the inclination angles of the nanolaminates with respect to the tensile direction from 0° to 90°. Slip transfer across phase boundaries, phase transformation and the nucleation of shear bands dominate the plasticity in the samples with low, medium and high inclination angles, respectively. Furthermore, the evolution of microstructures, such as dislocations, stacking faults, and FCC/HCP phase are analyzed to study the underlying deformation mechanisms. These results can help understand the plastic anisotropy of DP-HEAs and design alloys with excellent mechanical properties for engineering applications.

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Transition of plastic deformation mechanisms governed by spacing of nano-precipitates in a high entropy alloy

Cited by 38 publications

References 29 publications

Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

Phase Engineering of Nanostructural Metallic Materials: Classification, Structures, and Applications

Effect of loading orientation on plasticity in nano-laminated CoNiCrFeMn dual-phase high-entropy alloy: a molecular dynamics study

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