Mechanical properties and microstructure evolution of a CrCoNi medium entropy alloy subjected to asymmetric cryorolling and subsequent annealing

Zhang, Zhaoyang; Wu, Yuze; Bhatta, Laxman; Chang, L.; Gan, Bin; Kong, Charlie; Wang, Yu; Yu, Huimin

doi:10.1016/j.mtcomm.2020.101776

Cited by 14 publications

(8 citation statements)

References 47 publications

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“…Zhang et al confirmed that the CrCoNi MEA sheet showed better mechanical properties after annealing at 873 K, 973 K, and 1073 K by tensile tests. In addition, the sheets treated with a rolling speed ratio of 1.6 exhibited better mechanical properties than those treated with 1.2 [9]. Besides, specific material doping can further enhance the mechanical properties of NiCoCr MEA.…”

Section: Introductionmentioning

confidence: 92%

Buckling instability and compressive deformation of Ni-Co-Cr medium-entropy alloy nanotubes

Lu¹,

Fang²

2022

Modelling Simul. Mater. Sci. Eng.

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The aspect ratio has a significant effect on buckling instability. In this study, we used molecular dynamics (MD) simulation to investigate the buckling instability mechanism of NiCoCr medium-entropy alloy (MEA) nanotubes under the compression process. Based on the compression results, we find that the buckling point and the critical buckling stress decrease with increasing aspect ratio. The critical buckling stress of the MD simulations resembles the Euler and Rayleigh-Ritz theories. The critical aspect ratio of 10 showed instability at NiCoCr nanotubes. In addition, we found that the compressive strength of single-crystalline specimens is much higher than that of polycrystalline specimens. Partial dislocations (PDs) dominated by stacking faults (SFs) and twinning structures are mainly distributed on the grain boundaries of small grain specimens and decrease with increasing grain size. We also found that polycrystalline structures tend to induce buckling instability. The wall thickness specimen of the 7 nm has confirmed similar compressive strength as the nanowire. The compressive strength decreases as the wall thickness decreases. More stress concentration and PDs distributed in the specimen when the wall thickness is reduced to 1 nm, and it is easier to induce buckling instability at NiCoCr MEA nanotubes.

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Section: Introductionmentioning

confidence: 92%

Buckling instability and compressive deformation of Ni-Co-Cr medium-entropy alloy nanotubes

Lu¹,

Fang²

2022

Modelling Simul. Mater. Sci. Eng.

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“…The phenomenon of dynamic recovery of AMCs because heat generation during AR will not occur [24,25]. Therefore, ACR can form high-density dislocations and substructures in the HEAp/AMCs, which improves the comprehensive mechanical properties of the HEAp/AMCs [26]. ACR HEAp/AMCs can obviously observe more dimples than AR.…”

Section: Microstructure Analysismentioning

confidence: 99%

Effect of asymmetric rolling on microstructure and mechanical properties of aluminum matrix composites

Luo

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The lightweight of structural materials was an important research focus for reduced energy consumption and transport efficiency. Aluminium matrix composites (AMCs) had the advantages of high specific strength and good wear resistance, so they were widely used in automobile, aerospace and other fields. At present, the deformation mechanism of AMCs reinforced by high-entropy alloy particles (HEAp) in asymmetric rolling was not clear. In this work, AMCs ingot reinforced with 6 wt% HEAp was prepared by stir casting process. Then the mechanical properties of HEAp/AMCs under different rolling processes were studied by asymmetric rolling (AR) and asymmetric cryorolling (ACR) processes. High-entropy alloy (HEA) had excellent strength and toughness, which imparted good deformation ability when added to AMCs as reinforcement. The microstructure of AMCs reinforced by HEAp was refined by ACR. At the same time, the HEAp/AMCs obtained by ACR displayed a higher ultimate tensile strength (UTS) than that obtained by AR. The study of ACR shows that AMCs reinforced with HEAp have good toughness. ACR can reduce the thickness of HEAp/AMCs to a greater extent so as to produce AMCs strip with excellent mechanical properties.

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“…Excellent alloy design is reflected not only in the composition design [ 11 , 12 ], but also in the structure design. The design of heterogeneous structures through heat treatment or severe plastic deformation may significantly affect the mechanical behavior of materials [ 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

The Microstructure Evolution and Formation Mechanism of Gradient Nanostructure Prepared on CrCoNi Medium-Entropy Alloy

Dou

et al. 2023

Nanomaterials

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An equiatomic CrCoNi medium-entropy alloy was subjected to high-energy shot peening (HESP) to fabricate a gradient nanostructure (GNS) in this work. The microstructures of the GNS samples at different depths within the deformed layer were thoroughly investigated. The microstructure exhibited a transformation from unstressed coarse grains to deformed coarse grains, followed by the formation of ultrafine grains, and ultimately reaching a final nanocrystalline structure with a uniform size of approximately 50 nm. Detailed structural analysis indicated that the deformation process was primarily influenced by the interaction between dislocations and deformation twins, which was attributed to the low stacking fault energy (SFE) of the alloy. The nanocrystalline mechanism was divided into three stages. In the coarse-grained deformation stage, the dislocation band divided twin/matrix lamellae into sub-segments, and the cross twin divided coarse grains into ultrafine grains simultaneously. In the ultrafine grain deformation stage, dislocations were arranged around the deformation twins in order to break the twins to form incoherent boundaries, destroying the coherent relationship between the twin and matrix. Finally, in the nanocrystalline deformation stage, the nanocrystalline structure was further divided into smaller segments to accommodate additional strains through the interaction between dislocations and twins.

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Mechanical properties and microstructure evolution of a CrCoNi medium entropy alloy subjected to asymmetric cryorolling and subsequent annealing

Cited by 14 publications

References 47 publications

Buckling instability and compressive deformation of Ni-Co-Cr medium-entropy alloy nanotubes

Buckling instability and compressive deformation of Ni-Co-Cr medium-entropy alloy nanotubes

Effect of asymmetric rolling on microstructure and mechanical properties of aluminum matrix composites

The Microstructure Evolution and Formation Mechanism of Gradient Nanostructure Prepared on CrCoNi Medium-Entropy Alloy

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