Grain boundary evolution of highly nanotwinned alloys: Effect of initial twinned microstructure

Bahena, Joel A.; Juarez, Theresa; Velasco, Leonardo; Hodge, Andrea M.

doi:10.1016/j.scriptamat.2020.08.024

Cited by 8 publications

(2 citation statements)

References 33 publications

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“…In contrast, compared with Figure 16a-d), it can be found that the change of loading direction has little effect on the RDF, which indicates that different loading methods do not affect the arrangement of atoms. [19,20]…”

Section: Impact Of Loading Modementioning

confidence: 99%

Effect of Twin Spacing and Loading Mode on Mechanical Properties and Deformation Mechanism of NiCoAl Columnar Polycrystalline Alloy

Zhang,

Lu,

Yang

et al. 2023

Physica Status Solidi (b)

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Grain boundary engineering is an effective and feasible metal strengthening strategy to enhance the properties of nanopolycrystalline alloys by changing the number, configuration, and connectivity of different types of grain boundaries, especially for the twin boundaries. In the present contribution, the effect of twin spacing and loading mode on the deformation behavior and mechanism of NiCoAl columnar polycrystalline alloy is investigated. The results show that the nanotwins can not only increase the bearing capacity of dislocations but also emit many dislocations, resulting in the coupling effect of dislocation strengthening and twin strengthening. When the twin spacing is large, intrinsic stacking faults occur and gradually transform into deformation twins. In this stage, Shockley partial dislocation controls plastic deformation. When the twin spacing is small, the high‐density twin layers and stacking faults are more likely to interweave, showing a combination action of Shockley partial dislocation and stair‐rod dislocation. With the loading changing to Z axis, the yield strength decreases due to reduced resistance to the dislocation and a weakened number of Shockley partial dislocations of the emission, leading to less strengthening of the twins. The insights provide a solid theoretical foundation for the further application of NiCoAl in industrial production.

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Section: Impact Of Loading Modementioning

confidence: 99%

Effect of Twin Spacing and Loading Mode on Mechanical Properties and Deformation Mechanism of NiCoAl Columnar Polycrystalline Alloy

Zhang,

Lu,

Yang

et al. 2023

Physica Status Solidi (b)

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“…These can enhance Cu foil strength, but may lead to an increase in electrical resistance [ 13 ]. It has been demonstrated that an equiaxial nanotwinned (nt) structure significantly improves the mechanical strength [ 14 , 15 , 16 ] while its conductivity remains unchanged [ 17 ] because it does not cause electron scattering [ 18 , 19 , 20 , 21 , 22 ]. Therefore, such high-strength nt-Cu foils have potential for use as an LIB anode current collector.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cu Ion Concentration on Microstructures and Mechanical Properties of Nanotwinned Cu Foils Fabricated by Rotary Electroplating

2021

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Rotary electroplating was employed to fabricate high-strength nanotwinned copper (nt-Cu) foils serving as a current collector for high energy-density lithium ion batteries (LIBs). The effect of Cu ion concentration on the microstructural and mechanical properties of the nt-Cu foils was then investigated. Formation of nano-scaled grains was found at the bottom. Its size gradually increases toward the top surface to form a microstructural mixture of gradient nano-scaled and columnar grains in the upper region. Experimental results show that the grains and elongation of the nt-Cu foils increase with increasing concentration of Cu ions. However, a trade-off between tensile strength and elongation is present. The elongation of nt-Cu foils has been enhanced by 22% (from 3.1% to 3.8%) while 8.3% and 3.9% reductions in ultimate tensile strength (UTS) and yield stress (YS) are seen. The current study shows a promising method to tune and optimize the microstructure and mechanical properties of such nt-Cu foils for various applications.

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Distribution of nanodomains in heterogeneous Ni-superalloys: Effect on microstructure and mechanical deformation

Goodelman

Hodge

2023

Acta Materialia

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Grain boundary evolution of highly nanotwinned alloys: Effect of initial twinned microstructure

Cited by 8 publications

References 33 publications

Effect of Twin Spacing and Loading Mode on Mechanical Properties and Deformation Mechanism of NiCoAl Columnar Polycrystalline Alloy

Effect of Twin Spacing and Loading Mode on Mechanical Properties and Deformation Mechanism of NiCoAl Columnar Polycrystalline Alloy

Effect of Cu Ion Concentration on Microstructures and Mechanical Properties of Nanotwinned Cu Foils Fabricated by Rotary Electroplating

Distribution of nanodomains in heterogeneous Ni-superalloys: Effect on microstructure and mechanical deformation

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